I wonder if my Camaro drives normal / Automatic
05-07-2018, 06:26 PM
#21
Teching In
iTrader: (1)
Join Date: Apr 2018
Location: Richmond, VA
Posts: 18
Likes: 0
Received 0 Likes
on
0 Posts
I tried it with the factory lid today and think there's no change. But to be honest today I noticed again that it's not always exactly the same. I 'm not sure if it's a daily mood of my car, sometimes it seems to change when the weather changed, if it's the different temperature or humidity? I don't know for sure, but it's definitlely not always exactly same. But it's never okay.
Today it shifted not that much delayed, just a bit less than yesterday, but as hard as always. I made a few tests, shifting at light acceleration was just so acceptable, at stronger acceleration too hard and when I tried letting off the gas at 80 mph after strong (I mean as strong as possible without downshift...) acceleration in 3rd it slammed in 4th very fast and so hard that the laughter goes completely by. Still much too sensitive in downshifting and no change in how the TCC works. So at least no fundamental change.
What about the IAT sensor?
On my first short test drive with the factory lid I noticed afterwards that I forgot to reconnect it. But nothing changed through that, engine ran as good as always, no engine light, nothing. Seems that this sensor is needless. Can this be ok so or is there something wrong? Can this sensor also have to do with the shifting problems?
Today it shifted not that much delayed, just a bit less than yesterday, but as hard as always. I made a few tests, shifting at light acceleration was just so acceptable, at stronger acceleration too hard and when I tried letting off the gas at 80 mph after strong (I mean as strong as possible without downshift...) acceleration in 3rd it slammed in 4th very fast and so hard that the laughter goes completely by. Still much too sensitive in downshifting and no change in how the TCC works. So at least no fundamental change.
What about the IAT sensor?
On my first short test drive with the factory lid I noticed afterwards that I forgot to reconnect it. But nothing changed through that, engine ran as good as always, no engine light, nothing. Seems that this sensor is needless. Can this be ok so or is there something wrong? Can this sensor also have to do with the shifting problems?
05-08-2018, 05:48 PM
#22
Staging Lane
Thread Starter
Join Date: Apr 2018
Posts: 57
Likes: 0
Received 0 Likes
on
0 Posts
Today I called a workshop that's specialized in automatic transmissions. Luckily I had right the boss on the phone. He said they can do everything around the transmission, valvebody, electronical control, rebuild... He knows the 4L60E. But he is not sure, if he has the right test equipment software and data for my camaro so it could be efforting to find out what's the problem. This is always a problem with this car, because it's absolutly exotic here. No workshop seems to know anything about it. Many people here even don't know it. One time at the gas station an old man came, walked admiring around my car and then he asked: "This is a Viper, or?" 
But according to my description he is sure to find the problem not in the transmission itself. He also thinks the control module gives false instructions and it's to find out why. Perhaps it gets false information from any sensor, TCC-regulator valve also... so many can be...
I tend to bring the car there and let them look. It takes a little time because it's not around the corner. It's really hard to find a shop especially for automatic transmissions.
But according to my description he is sure to find the problem not in the transmission itself. He also thinks the control module gives false instructions and it's to find out why. Perhaps it gets false information from any sensor, TCC-regulator valve also... so many can be...
I tend to bring the car there and let them look. It takes a little time because it's not around the corner. It's really hard to find a shop especially for automatic transmissions.
05-08-2018, 07:36 PM
#23
Teching In
iTrader: (1)
Join Date: Apr 2018
Location: Richmond, VA
Posts: 18
Likes: 0
Received 0 Likes
on
0 Posts
Today I called a workshop that's specialized in automatic transmissions. Luckily I had right the boss on the phone. He said they can do everything around the transmission, valvebody, electronical control, rebuild... He knows the 4L60E. But he is not sure, if he has the right test equipment software and data for my camaro so it could be efforting to find out what's the problem. This is always a problem with this car, because it's absolutly exotic here. No workshop seems to know anything about it. Many people here even don't know it. One time at the gas station an old man came, walked admiring around my car and then he asked: "This is a Viper, or?"
But according to my description he is sure to find the problem not in the transmission itself. He also thinks the control module gives false instructions and it's to find out why. Perhaps it gets false information from any sensor, TCC-regulator valve also... so many can be...
I tend to bring the car there and let them look. It takes a little time because it's not around the corner. It's really hard to find a shop especially for automatic transmissions.
But according to my description he is sure to find the problem not in the transmission itself. He also thinks the control module gives false instructions and it's to find out why. Perhaps it gets false information from any sensor, TCC-regulator valve also... so many can be...
I tend to bring the car there and let them look. It takes a little time because it's not around the corner. It's really hard to find a shop especially for automatic transmissions.
, anyways keep me updated on the outcome of the shop experience!
05-25-2018, 04:55 AM
#25
Staging Lane
Thread Starter
Join Date: Apr 2018
Posts: 57
Likes: 0
Received 0 Likes
on
0 Posts
Yesterday I was whe whole forenoon on the way, I was at the transmission workshop. Once again the car assured the problem has to do with the weather...
To me it's mainly a fair weather car for only for the summer. Yesterday it rained and it shifted way better. On the way to the transmission man I noticed that not so much because it was a longer route with not so much shifting and I'm also automatically always careful with the gas to keep shifts as gently as possible.
He drove with me in the car and I tried again and again to show him the hard shifts. And it did not, it shifted smooth... What the hell? Again he said the problem is defenitily not in the transmission, it can shift very good.
I didn't test the hyper sensitive downshifting because there's no grip in the rain and I don't want the car to spin me out
But I remember it happened in the past on the highway that the car shifted once into 2nd at a little over 90 mph and jumped right over 5500 rpm. I DID NOT hit full throttle at this. I was shocked because I absolutely not expected it. This happened in the rain.
Yesterday I didn't want to try this. I have new Uniroyal Tigerpaw all season on the rear, the few hundred miles on dry street were ok, yesterday was my first drive in the rain with them. I have to say they have extremely bad grip on wet street. Sometimes I could hardly accelerate in 1st and 2nd, no grip, it was like on ice. So I better tried not at high rpms.
And yesterday the 1st time it happened the ASR failed temporarily when I drove with the workshop-man. I wanted to cause a hard shift, tyres spun for a moment, then a few warning signals in the cockpit, Brakes, ASR off and Security and I could not turn ASR back on.
After engine stop and restart it worked again didn't happen again after that.
After the drive the man said he thinks the TCC thing might be for tuning, and the hard shift and hyper sensitive downshift will be an electrical issue which causes the controle module not to know what's the real load condition, some signal problem which changes in the weather, he don't knows where to start and so and it's not the right job for them. On the phone last time it sounded different, I think with that tricky problem the car is too exotic for him.
To me it's mainly a fair weather car for only for the summer. Yesterday it rained and it shifted way better. On the way to the transmission man I noticed that not so much because it was a longer route with not so much shifting and I'm also automatically always careful with the gas to keep shifts as gently as possible.
He drove with me in the car and I tried again and again to show him the hard shifts. And it did not, it shifted smooth... What the hell? Again he said the problem is defenitily not in the transmission, it can shift very good.
I didn't test the hyper sensitive downshifting because there's no grip in the rain and I don't want the car to spin me out
But I remember it happened in the past on the highway that the car shifted once into 2nd at a little over 90 mph and jumped right over 5500 rpm. I DID NOT hit full throttle at this. I was shocked because I absolutely not expected it. This happened in the rain.Yesterday I didn't want to try this. I have new Uniroyal Tigerpaw all season on the rear, the few hundred miles on dry street were ok, yesterday was my first drive in the rain with them. I have to say they have extremely bad grip on wet street. Sometimes I could hardly accelerate in 1st and 2nd, no grip, it was like on ice. So I better tried not at high rpms.
And yesterday the 1st time it happened the ASR failed temporarily when I drove with the workshop-man. I wanted to cause a hard shift, tyres spun for a moment, then a few warning signals in the cockpit, Brakes, ASR off and Security and I could not turn ASR back on.
After engine stop and restart it worked again didn't happen again after that.
After the drive the man said he thinks the TCC thing might be for tuning, and the hard shift and hyper sensitive downshift will be an electrical issue which causes the controle module not to know what's the real load condition, some signal problem which changes in the weather, he don't knows where to start and so and it's not the right job for them. On the phone last time it sounded different, I think with that tricky problem the car is too exotic for him.
05-25-2018, 05:52 PM
#27
Staging Lane
Thread Starter
Join Date: Apr 2018
Posts: 57
Likes: 0
Received 0 Likes
on
0 Posts
No I don't have access to such a tuner.
To be sure it's not something tweaked in the pcm they put on the latest updated software at the chevy workshop. Chevrolet germany is already gone, there are just a few workshops around who are official service partners and deal with new Corvettes and Camaros. At this workshop it also seemed like they had never seen a Camaro like mine before
Today I asked at another workshop where the owners themselves drive older US-cars, they have a few Corvette C5s in their customers and next friday he will look on my car. Maybe they can help...
Also curious to me is what I told what happened yesterday with the ASR and the signals... It's rather rare but sometimes there were similar things when the car was driven and restartet after a short time. It happend a few times (last today) that Airbag signal was in the cockpit, once Security. After restart it was every time gone. And the daytrip is after every new engine start resetted to zero. Turn on ignition and it shows the driven daytrip, start the engine and it is zero.
Perhaps there is any ground problem what causes this and eventually the bad shifting too??
I'll try to look after that.
And for your another question, i forgot: I run the stock chrome finish wheels with 245/50R16
To be sure it's not something tweaked in the pcm they put on the latest updated software at the chevy workshop. Chevrolet germany is already gone, there are just a few workshops around who are official service partners and deal with new Corvettes and Camaros. At this workshop it also seemed like they had never seen a Camaro like mine before
Today I asked at another workshop where the owners themselves drive older US-cars, they have a few Corvette C5s in their customers and next friday he will look on my car. Maybe they can help...
Also curious to me is what I told what happened yesterday with the ASR and the signals... It's rather rare but sometimes there were similar things when the car was driven and restartet after a short time. It happend a few times (last today) that Airbag signal was in the cockpit, once Security. After restart it was every time gone. And the daytrip is after every new engine start resetted to zero. Turn on ignition and it shows the driven daytrip, start the engine and it is zero.
Perhaps there is any ground problem what causes this and eventually the bad shifting too??
I'll try to look after that.
And for your another question, i forgot: I run the stock chrome finish wheels with 245/50R16
07-21-2018, 10:49 AM
#28
Staging Lane
Thread Starter
Join Date: Apr 2018
Posts: 57
Likes: 0
Received 0 Likes
on
0 Posts
A time is gone and the problem still exists. The workshop could not help...
Then came another problem, needed new steering rack and can't get the air out of that damn system, but back to this...
I followed the tip with the load condition and pay close attention to it when I'm driving the car. I have noticed for some time differences not only at shifting (but this sucks more!) there are also differences in the engine performance. I did not give too much attention to that in the past, but it has not always full power, it's still very fast but feels like some torque missing especially at lower rpms but also in the higher the engine seems not breathing like it should.
And there are slight rpm fluctuations at 1400 rpm.
I had never before suspected the MAF sensor because there never was a code. But I tried a few things and disconnected the MAF sensor. The engine just stumbled for a moment and continued running clean. I sat in the car and saw no light went on. Ha? I drove the car and it felt a little different it was fast, felt some kind of "harder" on the gas but still torque missing and not full power feeling. Still very hard shifts.
I reconnected and read for codes and there were none. That's confusing but I read that this happened at others cars too.
The "torque missing" thing is getting more and more I notice. And I think it's hand in hand with the shifting thing because when shifting is better some times the engine is stronger and smoother too.
To describe the difference:
Imagine street is dry, ASR is turned off, I start slowly and at 10 mph I put the pedal to the floor...
If the car has his "full power feeling" the tyres will spin and leave two fat black stripes on the ground. But you know this
And if the car has his "torque missing feeling" I can floor the pedal and the car accelerates but there is not enouth power to spin the wheels, in worst case not even a little bit...
But please do not think I'd do that very often. No, I don't want to kill the car
In the last days I was at another workshop from a US-car guy and this man first suspected the MAF sensor, because it influences the shifting behavior too. He is the first one I met who has a tool to scan the car's data while driving, he has not time for my car before september but he said he thinks he can fix it.
I keep on telling news.
Then came another problem, needed new steering rack and can't get the air out of that damn system, but back to this...
I followed the tip with the load condition and pay close attention to it when I'm driving the car. I have noticed for some time differences not only at shifting (but this sucks more!) there are also differences in the engine performance. I did not give too much attention to that in the past, but it has not always full power, it's still very fast but feels like some torque missing especially at lower rpms but also in the higher the engine seems not breathing like it should.
And there are slight rpm fluctuations at 1400 rpm.
I had never before suspected the MAF sensor because there never was a code. But I tried a few things and disconnected the MAF sensor. The engine just stumbled for a moment and continued running clean. I sat in the car and saw no light went on. Ha? I drove the car and it felt a little different it was fast, felt some kind of "harder" on the gas but still torque missing and not full power feeling. Still very hard shifts.
I reconnected and read for codes and there were none. That's confusing but I read that this happened at others cars too.
The "torque missing" thing is getting more and more I notice. And I think it's hand in hand with the shifting thing because when shifting is better some times the engine is stronger and smoother too.
To describe the difference:
Imagine street is dry, ASR is turned off, I start slowly and at 10 mph I put the pedal to the floor...
If the car has his "full power feeling" the tyres will spin and leave two fat black stripes on the ground. But you know this
And if the car has his "torque missing feeling" I can floor the pedal and the car accelerates but there is not enouth power to spin the wheels, in worst case not even a little bit...
But please do not think I'd do that very often. No, I don't want to kill the car
In the last days I was at another workshop from a US-car guy and this man first suspected the MAF sensor, because it influences the shifting behavior too. He is the first one I met who has a tool to scan the car's data while driving, he has not time for my car before september but he said he thinks he can fix it.
I keep on telling news.
07-23-2018, 09:28 PM
#29
Definately an interesting problem, but it not shifting correctly and being delayed is screaming tuning for me, So if you can I suggest going to a tuner and having him look into it, It could be possible that the previous owner put a shift kit in there and it is failing, but if you know it’s completely bone stock then just take it to a tuner!
07-24-2018, 10:08 AM
#30
Staging Lane
Thread Starter
Join Date: Apr 2018
Posts: 57
Likes: 0
Received 0 Likes
on
0 Posts
Of course it will feel different response with shorter axle gear and tuning. But I don't think anymore that it's my car's problem because if it's axle and/or tune it would have to be always same, but it's not. It's sometimes more or less bad and rarely it's good too.
The last time the car shifted really good was after that longer rain drive to the automatic specialist. How I told... when I wanted to show him the hard shifts i could not even provoke a hard shift with full intention. The engine also had good response, felt strong and smooth.
And after that the rain was gone, on the way home I remember the great power of the car when I drove a section freeway with no speed limit. That time it was more fun to accelerate hard in 3rd at higher speeds than ever before since I own the car. Once I let it pull full til 150 mph and wondered how strong it was, it never felt so powerful before at such a speed.
A few days ago I took it again out in the rain for a drive around too see if something changes again through the water. I turned ASR off to be sure I feel all respones from the back. The drive was an up and down, sometimes it shifted good, but the more it shifted bad and also the engine response changed. Sometimes low response and torque missing, and sometimes good response and power immediately there. So big differences that I don't know how much I should step on the gas at accelerating in the rain because the car can react totally different each time. If it does a hard and unexpected downshift it's also dangerous in the rain, because with such a downshift the engine sometimes seems to switch from "torque missing modus" with low response to "full power modus" with high response...
I noticed another thing. At acceleration with about third to half gas (not more or it surely will shift down) the engine hesitates for a moment at around 2500 rpm, but not always like the rpm fluctuations at 1400 rpm.
Both of these things can surely better be noticed with a manual transmission car.
The last time the car shifted really good was after that longer rain drive to the automatic specialist. How I told... when I wanted to show him the hard shifts i could not even provoke a hard shift with full intention. The engine also had good response, felt strong and smooth.
And after that the rain was gone, on the way home I remember the great power of the car when I drove a section freeway with no speed limit. That time it was more fun to accelerate hard in 3rd at higher speeds than ever before since I own the car. Once I let it pull full til 150 mph and wondered how strong it was, it never felt so powerful before at such a speed.
A few days ago I took it again out in the rain for a drive around too see if something changes again through the water. I turned ASR off to be sure I feel all respones from the back. The drive was an up and down, sometimes it shifted good, but the more it shifted bad and also the engine response changed. Sometimes low response and torque missing, and sometimes good response and power immediately there. So big differences that I don't know how much I should step on the gas at accelerating in the rain because the car can react totally different each time. If it does a hard and unexpected downshift it's also dangerous in the rain, because with such a downshift the engine sometimes seems to switch from "torque missing modus" with low response to "full power modus" with high response...
I noticed another thing. At acceleration with about third to half gas (not more or it surely will shift down) the engine hesitates for a moment at around 2500 rpm, but not always like the rpm fluctuations at 1400 rpm.
Both of these things can surely better be noticed with a manual transmission car.
07-24-2018, 10:18 AM
#31
so there's no check engine light correct?
the hesitation I'm thinking could be a misfire due to possibly a bad plug wire or plug itself. without a way to scan or look at the tune it's rather difficult to correctly diagnose what's going on. I wonder if swapping another 99 pcm from another Camaro (see if anyone is selling one in the US) and see if that help in eliminating a pcm issue since it appears to occur when it rains.
edit-also any info on the torque converter? did the transmission guy check the converter?
the hesitation I'm thinking could be a misfire due to possibly a bad plug wire or plug itself. without a way to scan or look at the tune it's rather difficult to correctly diagnose what's going on. I wonder if swapping another 99 pcm from another Camaro (see if anyone is selling one in the US) and see if that help in eliminating a pcm issue since it appears to occur when it rains.
edit-also any info on the torque converter? did the transmission guy check the converter?
Last edited by fst100; 07-24-2018 at 10:39 AM.
07-24-2018, 02:01 PM
#32
LS1Tech Administrator
iTrader: (3)
Join Date: Nov 2001
Location: Schiller Park, IL Member: #317
Posts: 32,046
Likes: 0
Received 1,493 Likes
on
1,075 Posts
I just read through this thread and a couple of things stand out to me.
First, I disagree with the idea that this problem has anything to do with the gear ratio. I've owned two 2.73 A4 LS1 Camaros and neither of them ever behaved in this way (meaning no super hard shifts, no super sensitive downshifting, nor any other related erratic behavior, nor any times of drastic changes in acceleration ability). FWIW, I've also owned two 3.23 examples and, other than some differences in shift points, their road behavior and shift feel were exactly the same as the 2.73 cars. Also, the intermittent nature of this issue would indicate that it's certainly not a matter of "normal" operation for this combo.
As for tuning, that's not the issue either - unless it had a poor aftermarket tune perhaps. They didn't leave the factory with this kind of erratic behavior in my experience; none of mine (2.73 or 3.23 examples) ever behaved this way on the stock factory tune. However, the OP mentioned having a GM reflash done just to rule out any aftermarket tuning, and it sounds as though this helped some but didn't clear up the issue entirely. Perhaps there is an issue with the PCM itself?
It sounds like a lot of other common possible causes have already been addressed (MAF, TPS, some internal transmission parts, etc.) without any success. This is a difficult issue for sure, but I assure you it's not "normal" due to the factory gear ratio nor should any aftermarket tuning be needed to prevent this from happening on a stock example.
First, I disagree with the idea that this problem has anything to do with the gear ratio. I've owned two 2.73 A4 LS1 Camaros and neither of them ever behaved in this way (meaning no super hard shifts, no super sensitive downshifting, nor any other related erratic behavior, nor any times of drastic changes in acceleration ability). FWIW, I've also owned two 3.23 examples and, other than some differences in shift points, their road behavior and shift feel were exactly the same as the 2.73 cars. Also, the intermittent nature of this issue would indicate that it's certainly not a matter of "normal" operation for this combo.
As for tuning, that's not the issue either - unless it had a poor aftermarket tune perhaps. They didn't leave the factory with this kind of erratic behavior in my experience; none of mine (2.73 or 3.23 examples) ever behaved this way on the stock factory tune. However, the OP mentioned having a GM reflash done just to rule out any aftermarket tuning, and it sounds as though this helped some but didn't clear up the issue entirely. Perhaps there is an issue with the PCM itself?
It sounds like a lot of other common possible causes have already been addressed (MAF, TPS, some internal transmission parts, etc.) without any success. This is a difficult issue for sure, but I assure you it's not "normal" due to the factory gear ratio nor should any aftermarket tuning be needed to prevent this from happening on a stock example.
07-24-2018, 02:01 PM
#33
Staging Lane
Thread Starter
Join Date: Apr 2018
Posts: 57
Likes: 0
Received 0 Likes
on
0 Posts
Correct no engine light and no codes.
But after I know now that there's not even a engine light or a code after I drive it with unplugged MAF sensor, I don't know what to think of it anyway.
I'll try another sensor and if it helps not I'll wait til september. Then the guy who thinks he can find and fix the issue returns from vacation and can scan the car reasonable.
The hesitation sometimes at around 2500 rpm feels not like misfiring, more like the engine would get choked and can not breathe just for a moment. Maybe the flunctuations at 1400 rpm are the same "choking", I can not say that for sure.
Plugs are new, replaced them recently (what a ******* job!) with Denso Iridiums, could not see any damage on the wires.
But after I know now that there's not even a engine light or a code after I drive it with unplugged MAF sensor, I don't know what to think of it anyway.
I'll try another sensor and if it helps not I'll wait til september. Then the guy who thinks he can find and fix the issue returns from vacation and can scan the car reasonable.
The hesitation sometimes at around 2500 rpm feels not like misfiring, more like the engine would get choked and can not breathe just for a moment. Maybe the flunctuations at 1400 rpm are the same "choking", I can not say that for sure.
Plugs are new, replaced them recently (what a ******* job!) with Denso Iridiums, could not see any damage on the wires.
07-24-2018, 02:06 PM
#34
Staging Lane
Thread Starter
Join Date: Apr 2018
Posts: 57
Likes: 0
Received 0 Likes
on
0 Posts
I just read through this thread and a couple of things stand out to me.
First, I disagree with the idea that this problem has anything to do with the gear ratio. I've owned two 2.73 A4 LS1 Camaros and neither of them ever behaved in this way (meaning no super hard shifts, no super sensitive downshifting, nor any other related erratic behavior, nor any times of drastic changes in acceleration ability). Also, as the issue seems to be intermittent, that would indicate that it's certainly not a matter of "normal" operation for this combo.
As for tuning, that's not the issue either - unless it had a poor aftermarket tune perhaps. They didn't leave the factory with this kind of erratic behavior in my experience; none of mine (2.73 or 3.23 examples) ever behaved this way on the stock factory tune. However, the OP mentioned having a GM reflash done just to rule out any aftermarket tuning, and it sounds as though this helped some but didn't clear up the issue entirely. Perhaps there is an issue with the PCM itself?
It sounds like a lot of other common possible causes have already been addressed (MAF, TPS, some internal transmission parts, etc.) without any success. This is a difficult issue for sure, but I assure you it's not "normal" due to the factory gear ratio nor should any aftermarket tuning be needed to prevent this from happening on a stock example.
First, I disagree with the idea that this problem has anything to do with the gear ratio. I've owned two 2.73 A4 LS1 Camaros and neither of them ever behaved in this way (meaning no super hard shifts, no super sensitive downshifting, nor any other related erratic behavior, nor any times of drastic changes in acceleration ability). Also, as the issue seems to be intermittent, that would indicate that it's certainly not a matter of "normal" operation for this combo.
As for tuning, that's not the issue either - unless it had a poor aftermarket tune perhaps. They didn't leave the factory with this kind of erratic behavior in my experience; none of mine (2.73 or 3.23 examples) ever behaved this way on the stock factory tune. However, the OP mentioned having a GM reflash done just to rule out any aftermarket tuning, and it sounds as though this helped some but didn't clear up the issue entirely. Perhaps there is an issue with the PCM itself?
It sounds like a lot of other common possible causes have already been addressed (MAF, TPS, some internal transmission parts, etc.) without any success. This is a difficult issue for sure, but I assure you it's not "normal" due to the factory gear ratio nor should any aftermarket tuning be needed to prevent this from happening on a stock example.
07-25-2018, 03:43 AM
#35
Staging Lane
Thread Starter
Join Date: Apr 2018
Posts: 57
Likes: 0
Received 0 Likes
on
0 Posts
As for tuning, that's not the issue either - unless it had a poor aftermarket tune perhaps. They didn't leave the factory with this kind of erratic behavior in my experience; none of mine (2.73 or 3.23 examples) ever behaved this way on the stock factory tune. However, the OP mentioned having a GM reflash done just to rule out any aftermarket tuning, and it sounds as though this helped some but didn't clear up the issue entirely..
07-25-2018, 07:23 AM
#37
Staging Lane
Thread Starter
Join Date: Apr 2018
Posts: 57
Likes: 0
Received 0 Likes
on
0 Posts
No not really, once I had a weird smell after reving up the car for some time, but not really like rotten eggs. I looked after that but could not find where the smell came from. After a time it was gone so I blamed it on the high temperature paint I sprayed on the exhaust muffler. After it was gone I never had that smell again.
The car passed the exhaust emission test from the TÜV with no problem.
07-25-2018, 09:42 AM
#38
ok. just thought i'd ask. sometimes a clogged cat would cause stumbling/hesitation and other odd feeling in driving and sometimes cause the O2 sensor to go off but not always.
so from my reading the following were changed:
MAF sensor
TPS sensor
Transmission (what was all done to it?)
TCC sensor
IAT
reflashed PCM
does it in dry weather but doesn't in wet weather correct?
has the torque converter been checked? the converter would regulate pressure and shifting as well as engaging and disengage during pcm lockup command. also the TCC engages typically in 4th gear but I've seen it engage in 3rd so I imagine it depends on year and trim I think. what I'm getting at is the converter typically doesn't lock up until the pcm sees the trans temp reach a certain temp such as around 90-95 degrees Fahrenheit.
I had an experience in my grand prix where it was making a ticking sound very similar to a bottom-end rod bearing or broken flexplate which was very unusual since I was told a bad or faulty converter makes a whirling sound.
so from my reading the following were changed:
MAF sensor
TPS sensor
Transmission (what was all done to it?)
TCC sensor
IAT
reflashed PCM
does it in dry weather but doesn't in wet weather correct?
has the torque converter been checked? the converter would regulate pressure and shifting as well as engaging and disengage during pcm lockup command. also the TCC engages typically in 4th gear but I've seen it engage in 3rd so I imagine it depends on year and trim I think. what I'm getting at is the converter typically doesn't lock up until the pcm sees the trans temp reach a certain temp such as around 90-95 degrees Fahrenheit.
I had an experience in my grand prix where it was making a ticking sound very similar to a bottom-end rod bearing or broken flexplate which was very unusual since I was told a bad or faulty converter makes a whirling sound.
07-25-2018, 06:36 PM
#39
Staging Lane
Thread Starter
Join Date: Apr 2018
Posts: 57
Likes: 0
Received 0 Likes
on
0 Posts
Yes checked or replaced are:
TPS
IAT sensor
PCM reflashed
Transmission checked and found ok, flushed, new filter, new TCC solenoid
and today I tried another MAF sensor, no difference.
Because of the emission test was perfect I'd say the cats and O2 sensors are ok.
No workshop I was at til now considered the torque converter. But me by myself thought once of it, if it eventually could fail in the way to lose some torque? And somewhere I read a bad torque converter could cause vibrations. How I described once earlier in this thread, sometimes I notice slight vibrations from the powertrain, but no noise. Ok, that's a lie, the rear axle makes slight noises but they have not to do with the vibration. It's also not always, yesterday I noticed it again just temporarily, it does it mostly when driving in D in 3rd at 50 mph or more and only at constant drive and slight acceleration with locked TC. I never noticed vibrations when TC is unlocked.
Converter can not be checked with transmission in the car, is that right?
TPS
IAT sensor
PCM reflashed
Transmission checked and found ok, flushed, new filter, new TCC solenoid
and today I tried another MAF sensor, no difference.
Because of the emission test was perfect I'd say the cats and O2 sensors are ok.
No workshop I was at til now considered the torque converter. But me by myself thought once of it, if it eventually could fail in the way to lose some torque? And somewhere I read a bad torque converter could cause vibrations. How I described once earlier in this thread, sometimes I notice slight vibrations from the powertrain, but no noise. Ok, that's a lie, the rear axle makes slight noises but they have not to do with the vibration. It's also not always, yesterday I noticed it again just temporarily, it does it mostly when driving in D in 3rd at 50 mph or more and only at constant drive and slight acceleration with locked TC. I never noticed vibrations when TC is unlocked.
Converter can not be checked with transmission in the car, is that right?