Anyone seen these problems?
My post was actually long but didnt take so I had to redo it.
Basically, I had the same problem after getting gas one day, figure it was the gas. Changed filter, cleaned the Air Filter and MAF, and still there. This was about 2months after replacing the plugs. The wires had somehow loosened up, enough to make it run a little rough until WOT. I had checked them by a light tug, and it was on. Then when messing with them again, I noticed there was a the single click on the coil, and double on the plugs or vice versa. So, I had taken them all off, checked with an Ohm meter, and then put them back on and no more problem. Just for what its worth.
Good luck.
Charlie
Basically, I had the same problem after getting gas one day, figure it was the gas. Changed filter, cleaned the Air Filter and MAF, and still there. This was about 2months after replacing the plugs. The wires had somehow loosened up, enough to make it run a little rough until WOT. I had checked them by a light tug, and it was on. Then when messing with them again, I noticed there was a the single click on the coil, and double on the plugs or vice versa. So, I had taken them all off, checked with an Ohm meter, and then put them back on and no more problem. Just for what its worth.
Good luck.
Charlie
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Had it scanned. #6 misfire came up on two different places scanners. I figured plugs and wires. Evedently not. A vaccum leak would't cause one cylinder to misfire would it.
I have practically done everything that it could be to that cylinder along with replacing plugs,wires,and injectors on all cylinders
I have practically done everything that it could be to that cylinder along with replacing plugs,wires,and injectors on all cylinders
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From: It's hard work to look this good
Originally Posted by CAT3
My post was actually long but didnt take so I had to redo it.
Basically, I had the same problem after getting gas one day, figure it was the gas. Changed filter, cleaned the Air Filter and MAF, and still there. This was about 2months after replacing the plugs. The wires had somehow loosened up, enough to make it run a little rough until WOT. I had checked them by a light tug, and it was on. Then when messing with them again, I noticed there was a the single click on the coil, and double on the plugs or vice versa. So, I had taken them all off, checked with an Ohm meter, and then put them back on and no more problem. Just for what its worth.
Good luck.
Charlie
Basically, I had the same problem after getting gas one day, figure it was the gas. Changed filter, cleaned the Air Filter and MAF, and still there. This was about 2months after replacing the plugs. The wires had somehow loosened up, enough to make it run a little rough until WOT. I had checked them by a light tug, and it was on. Then when messing with them again, I noticed there was a the single click on the coil, and double on the plugs or vice versa. So, I had taken them all off, checked with an Ohm meter, and then put them back on and no more problem. Just for what its worth.
Good luck.
Charlie
no i dont think the vaccum leak would cause a misfire. damn.. im kinda lost on this one. i mean you've done just about everything i would have done. if worst came to worst..i think id have to pull the head to check and make sure nothing is wrong in the cylinder itself, maybe, but I dont think you'd have to...i know there's something else, just cant think of what it is. :dunno:
You guys have checked your plugs right? These guys had fouled plugs caused by octane booster.
http://www.installuniversity.com/ins...b_8.072000.htm
http://www.installuniversity.com/ins...b_8.072000.htm
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So far I had it scanned and the #6 cylinder was cutting out. I repaced spark plug, switched coil packs, put the stock wires back on instead of the MSD plug wires, I should have the rest of my pieces by this weekend and am going to put new injectors on. Im going to go ahead and also replace the fuel fiter again. Very interesting about the spark plugs though.....I changed mine when I did my header install. Which is about 15-20k miles ago before I got the car retuned. Maybe the pugs are fouling out time to time?
Originally Posted by jlrz28
So far I had it scanned and the #6 cylinder was cutting out. I repaced spark plug, switched coil packs, put the stock wires back on instead of the MSD plug wires, I should have the rest of my pieces by this weekend and am going to put new injectors on. Im going to go ahead and also replace the fuel fiter again. Very interesting about the spark plugs though.....I changed mine when I did my header install. Which is about 15-20k miles ago before I got the car retuned. Maybe the pugs are fouling out time to time?
I read all thats been happening, and wow, I haven't seen this YET, I'm sure It'll happen soon enough though. Has anyone checked out the EVAP system?? I know faulty purge solenoids can cause what you are describing. Course OBD II monitors the EVAP system using engine vacuum, so it would throw a code....maybe its worth just checking the purge soleniod and fuel pressure sensor. Good Luck and I hope you get it fixed.
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From: Schiller Park, ILL Member: #317
Here's an idea.
I have yet to pull a fuel pump on a 4th gen or see the full assembly, but on my old TPI car there was a white sock like device that acted as sort of a "pre" filter right at the fuel pump inside the tank. Do these cars have this "sock"?
Seems to me after reading this thread that one common factor for people with this issue was "after filling up the tank....". So bad gas could be a possibility, but no matter how many parts you change, if that sock inside the tank is clogged it's not going to help you. Of course that is assuming these cars have that sock....
Did anyone develop this issue without having "just filled up"?
I have yet to pull a fuel pump on a 4th gen or see the full assembly, but on my old TPI car there was a white sock like device that acted as sort of a "pre" filter right at the fuel pump inside the tank. Do these cars have this "sock"?
Seems to me after reading this thread that one common factor for people with this issue was "after filling up the tank....". So bad gas could be a possibility, but no matter how many parts you change, if that sock inside the tank is clogged it's not going to help you. Of course that is assuming these cars have that sock....
Did anyone develop this issue without having "just filled up"?
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From: It's hard work to look this good
Originally Posted by RPM WS6
Here's an idea.
I have yet to pull a fuel pump on a 4th gen or see the full assembly, but on my old TPI car there was a white sock like device that acted as sort of a "pre" filter right at the fuel pump inside the tank. Do these cars have this "sock"?
Seems to me after reading this thread that one common factor for people with this issue was "after filling up the tank....". So bad gas could be a possibility, but no matter how many parts you change, if that sock inside the tank is clogged it's not going to help you. Of course that is assuming these cars have that sock....
Did anyone develop this issue without having "just filled up"?
I have yet to pull a fuel pump on a 4th gen or see the full assembly, but on my old TPI car there was a white sock like device that acted as sort of a "pre" filter right at the fuel pump inside the tank. Do these cars have this "sock"?
Seems to me after reading this thread that one common factor for people with this issue was "after filling up the tank....". So bad gas could be a possibility, but no matter how many parts you change, if that sock inside the tank is clogged it's not going to help you. Of course that is assuming these cars have that sock....
Did anyone develop this issue without having "just filled up"?
I appreciate your response I'm not sure if it does or not. thanks for not mentioning spark plugs again at least you read everything it kinda helps make the situation clearer. Thanks again I'll research that a little.
Ok for those that haven't read the thread totally I personally have done the following to my car. car started mising stumbling and such.... wont accept gas at times and then gets a burst and hauls ***, car is an m6 by the way. took a few days for the SES light to blink. Scanned it #6 misfire. Changed plugs,wires,injectors
on all cylinders and coil pack on #6. Still doing it. Funny thing is, after changing injectors it ran fine for 2 days.
Thanks for evryones opinons thus far
Last edited by Tranzaman00; Aug 30, 2004 at 04:32 PM.
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Hey Tranzaman00 your car is a 2000 I believe also. I am being told after I change the injectors make sure you get the car tuned. So maybe you car is running richer and its getting more fuel and its fouling out the plugs? Since it ran fine for a while then started doing it again? Just an idea but man I cant get my car to do it again for some reason!!!!! IT DRIVES ME CRAZY!!!!!!
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From: It's hard work to look this good
Originally Posted by jlrz28
Hey Tranzaman00 your car is a 2000 I believe also. I am being told after I change the injectors make sure you get the car tuned. So maybe you car is running richer and its getting more fuel and its fouling out the plugs? Since it ran fine for a while then started doing it again? Just an idea but man I cant get my car to do it again for some reason!!!!! IT DRIVES ME CRAZY!!!!!!
Yes there is a sock on the intank fuel pump, and yes they get messed up easily. I called Ramchargers and got a new one, only a month after installing my Walbro 340 which came with a new sock. The tank was nasty.
Sorry for mentioning plugs again, but thought maybe someone else having the same issues hadnt rechecked there yet. I know I had swpaped mine, and checked and then afterwards found out the damn thing was not set in.
As for Cyl #6, hate to be obvious, but have you done a search for #6 misfire in this section and in the Diagnostic Section? Maybe something archived, I dont know. It doesnt sound right. If you swap out plugs, wires and coils, injectors on that cylinder with ones from another cyl and the problem is still there? Hate to ask, but are your valve springs duals? drew778 thought he had a bad tune once, his car would run a little rough, and crappy at startup but WOT seemed ok, missed too. Pulled the cover and seen one of his new dual springs had broke the inner spring in a couple places, luckily it was all in the pocket.
Good luck
Charlie
Sorry for mentioning plugs again, but thought maybe someone else having the same issues hadnt rechecked there yet. I know I had swpaped mine, and checked and then afterwards found out the damn thing was not set in.
As for Cyl #6, hate to be obvious, but have you done a search for #6 misfire in this section and in the Diagnostic Section? Maybe something archived, I dont know. It doesnt sound right. If you swap out plugs, wires and coils, injectors on that cylinder with ones from another cyl and the problem is still there? Hate to ask, but are your valve springs duals? drew778 thought he had a bad tune once, his car would run a little rough, and crappy at startup but WOT seemed ok, missed too. Pulled the cover and seen one of his new dual springs had broke the inner spring in a couple places, luckily it was all in the pocket.
Good luck
Charlie
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From: It's hard work to look this good
Originally Posted by CAT3
Yes there is a sock on the intank fuel pump, and yes they get messed up easily. I called Ramchargers and got a new one, only a month after installing my Walbro 340 which came with a new sock. The tank was nasty.
Sorry for mentioning plugs again, but thought maybe someone else having the same issues hadnt rechecked there yet. I know I had swpaped mine, and checked and then afterwards found out the damn thing was not set in.
As for Cyl #6, hate to be obvious, but have you done a search for #6 misfire in this section and in the Diagnostic Section? Maybe something archived, I dont know. It doesnt sound right. If you swap out plugs, wires and coils, injectors on that cylinder with ones from another cyl and the problem is still there? Hate to ask, but are your valve springs duals? drew778 thought he had a bad tune once, his car would run a little rough, and crappy at startup but WOT seemed ok, missed too. Pulled the cover and seen one of his new dual springs had broke the inner spring in a couple places, luckily it was all in the pocket.
Good luck
Charlie
Sorry for mentioning plugs again, but thought maybe someone else having the same issues hadnt rechecked there yet. I know I had swpaped mine, and checked and then afterwards found out the damn thing was not set in.
As for Cyl #6, hate to be obvious, but have you done a search for #6 misfire in this section and in the Diagnostic Section? Maybe something archived, I dont know. It doesnt sound right. If you swap out plugs, wires and coils, injectors on that cylinder with ones from another cyl and the problem is still there? Hate to ask, but are your valve springs duals? drew778 thought he had a bad tune once, his car would run a little rough, and crappy at startup but WOT seemed ok, missed too. Pulled the cover and seen one of his new dual springs had broke the inner spring in a couple places, luckily it was all in the pocket.
Good luck
Charlie
Thanks for your advice and also leting me know about the sock thing. I hope I didn't sound like an *** when I mentioned the spark plug thing. If anyone took offense to that I apologize
. I have stock springs so they are singlesprings right. If it was the spring would it not be a constant problem and also being a stock spring wouldn't the valve just fall if the spring was broke. I tried
doing a search for the #6 misfire and it says it is to short of a word or words or something like that. Anyway for people reading this for the first time all the plugs are new + all wires + injectors + fuel rail all new. I did not by a new coil pack just swapped it w/another cyl. still #6 misfire, did not follw to the cyl. I swapped with.
Thanks again Charlie and everyone else. Oh yeah slyws6 told me to pull off the valve cover awhile back to look for the broke valve spring, but my local parts store doesn't have the gasket and they also dont carry the springs. Thanks alot advance auto. so advanced they don't carry parts for the most recent advanced engines. Dealership is an hr. away
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From: Schiller Park, ILL Member: #317
Originally Posted by Tranzaman00
car is an m6 by the way. took a few days for the SES light to blink. Scanned it #6 misfire.
Just made me think. M6 + misfire, bent pushrod? Any missed shifts prior to this issue happening? Or bang the limiter really hard? Are you hearing any ticking at all?
If the car is an '00 then that vave cover gasket is reuseable. It should be rubber. Stock P-rods bend easy. Not to say that this is the answer for all the people sharing the issue in this thread, but this may explain your situation. If you had a fuel delivery issue, I can't see why it would only toss a P0306 code. I'd think it to be a "system lean" DTC or maybe a general P0300.
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From: It's hard work to look this good
Originally Posted by RPM WS6
Hmmm,
Just made me think. M6 + misfire, bent pushrod? Any missed shifts prior to this issue happening? Or bang the limiter really hard? Are you hearing any ticking at all?
If the car is an '00 then that vave cover gasket is reuseable. It should be rubber. Stock P-rods bend easy. Not to say that this is the answer for all the people sharing the issue in this thread, but this may explain your situation. If you had a fuel delivery issue, I can't see why it would only toss a P0306 code. I'd think it to be a "system lean" DTC or maybe a general P0300.
Just made me think. M6 + misfire, bent pushrod? Any missed shifts prior to this issue happening? Or bang the limiter really hard? Are you hearing any ticking at all?
If the car is an '00 then that vave cover gasket is reuseable. It should be rubber. Stock P-rods bend easy. Not to say that this is the answer for all the people sharing the issue in this thread, but this may explain your situation. If you had a fuel delivery issue, I can't see why it would only toss a P0306 code. I'd think it to be a "system lean" DTC or maybe a general P0300.
(autozone is about an hr. away) went to advance to get my ngk's and found out they had just got a scanner earlier that week so now they are doing it for free. Anyways theres also said #6 misfire. Whats up with the first guys reading he is the one that charged 55.00 and didn't tell me which cylinder.
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From: Schiller Park, ILL Member: #317
Originally Posted by Tranzaman00
Ok what do you make of this. The first place I took it to (local mechanic) his scanner or whatever he used I didn't get to see said Code po 300 random misfire code. I didn't know autozone did it for free so I took it here since he didn't tell me which cylinder, Theres said cyl. 6 misfire. Then I got back home
(autozone is about an hr. away) went to advance to get my ngk's and found out they had just got a scanner earlier that week so now they are doing it for free. Anyways theres also said #6 misfire. Whats up with the first guys reading he is the one that charged 55.00 and didn't tell me which cylinder.
(autozone is about an hr. away) went to advance to get my ngk's and found out they had just got a scanner earlier that week so now they are doing it for free. Anyways theres also said #6 misfire. Whats up with the first guys reading he is the one that charged 55.00 and didn't tell me which cylinder.
The fuel pump sock being clogged by bad gas might explain this issue for those not getting any DTCs, but in your case I'm not so sure with that code you're getting.
There's really not much else you can try besides checking the valvetrain. I doubt it's a broken spring though. First, because it's rare to break a stock spring with a stock cam, and second because rarely does a single spring (stock are single) break without causing major issues leaving your motor barely running, if at all (like bending valves at the very least and leading up to destroying your motor right then).
Again, are you hearing any ticking or unusual motor noise?
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From: It's hard work to look this good
Originally Posted by RPM WS6
Lots of cammed LS1s will toss the general P0300 random misfire (I turned mine off) due to the cam, but usually if you have a problem with a specfic cylinder being dead it'll give you a P0301 - P0308 for exact info. Not sure why the first scanner only showed the P0300 unless perhaps at that point the issue was not related to a specfic cylinder yet. Maybe all your P-rods are slightly bent, but #6 just happened to get worse first. Usually, bent P-rods get worse the longer you let them go. Again, not saying for sure that this is your problem, but with all the other parts you've swapped out you're running out of possibilities. You may still be getting the P0300 in addition to a P0306.
The fuel pump sock being clogged by bad gas might explain this issue for those not getting any DTCs, but in your case I'm not so sure with that code you're getting.
There's really not much else you can try besides checking the valvetrain. I doubt it's a broken spring though. First, because it's rare to break a stock spring with a stock cam, and second because rarely does a single spring (stock are single) break without causing major issues leaving your motor barely running, if at all (like bending valves at the very least and leading up to destroying your motor right then).
Again, are you hearing any ticking or unusual motor noise?
The fuel pump sock being clogged by bad gas might explain this issue for those not getting any DTCs, but in your case I'm not so sure with that code you're getting.
There's really not much else you can try besides checking the valvetrain. I doubt it's a broken spring though. First, because it's rare to break a stock spring with a stock cam, and second because rarely does a single spring (stock are single) break without causing major issues leaving your motor barely running, if at all (like bending valves at the very least and leading up to destroying your motor right then).
Again, are you hearing any ticking or unusual motor noise?
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Yeah when my car does the whole miss fire it throws no codes. Jayson @ MTI put the Tech2 on the car and found out which cylinder it was and it was the # 6. Whats the firing order on an LS1? When does the #6 cylinder fire? Possibly if its at the end or begining the computer might be having some problems?
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From: It's hard work to look this good
Originally Posted by jlrz28
Yeah when my car does the whole miss fire it throws no codes. Jayson @ MTI put the Tech2 on the car and found out which cylinder it was and it was the # 6. Whats the firing order on an LS1? When does the #6 cylinder fire? Possibly if its at the end or begining the computer might be having some problems?
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From: Pearland, Tx
Originally Posted by Tranzaman00
Firing order is 1-8-7-2-6-5-4-3. And man does your thread get way more attention than mine hope you don't mind me crashing over hear we are having the same problem. I'll chip in on grocieries and rent
No I dont mind seems like everyone is having the same problems!