problems after 1st regular "legal" drive
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Launching!
Joined: Nov 2002
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From: Houston
problems after 1st regular "legal" drive Well guys I got all of my lights working and my speedometer calibrated this week, so I drove over to the inspection shop. After passing the grueling 
safety inspection I started the car up for the drive around the block back the house. On the way over I noticed that the LS1 was running very rough, not a misfire, but more like a timing issue, but then it smoothed out after I cruised a couple hundred yards down the street. Well on the way home it did the same thing again, only this time it took longer to correct itself. Ive driven the car 5 times today, and its like the PCM has to relearn timing each time i start it. I hope i can fix this issue this week, because im going to try to drive about 200+ miles to school this weekend. I know i should have a decent scanner or autotap by now, but it seriously isnt in the budget.
-Gordon
safety inspection I started the car up for the drive around the block back the house. On the way over I noticed that the LS1 was running very rough, not a misfire, but more like a timing issue, but then it smoothed out after I cruised a couple hundred yards down the street. Well on the way home it did the same thing again, only this time it took longer to correct itself. Ive driven the car 5 times today, and its like the PCM has to relearn timing each time i start it. I hope i can fix this issue this week, because im going to try to drive about 200+ miles to school this weekend. I know i should have a decent scanner or autotap by now, but it seriously isnt in the budget. -Gordon
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Launching!
Joined: Nov 2002
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From: Houston
Re: problems after 1st regular oh yeah, ive checked the pulg wires. It seems to me that the PCM is losing memory everyt time i kill the ignition... of course thats just speculation. I crank it up, it runs fine for about 30 seconds to a minute, then if i let it idle it starts to run very rough until it gets to about 150 - 160 degrees, then it does a surge of some kind and it usually smooths out. It does the same thing if Im driving it after about 3-4 minutes usually. Im gonna try to make it over to MTI sometime this week (good thing about living in houston) and hope they decide to have a look at it for me, even though they programmed it initialy 2 years ago, when I first started this project. Any help is good help at this time guys!!
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Launching!
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From: Houston
Re: problems after 1st regular Well the Howell racing harness (they supply TPIS with thier harneses) has 4 wires, a pink, a purple, and 2 reds. The pink is keyed hot, the purple is crank signal, and the 2 hots are full time. I have the pink and purple hooked up at the ignition switch and one red is going to a terminal block that has full time 12 volts form the battery, and the other one is on a all time hot fuse on my chasis fuse block
Thread Starter
Launching!
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From: Houston
Re: problems after 1st regular just got back form MTI. Jayson got rid of the reverse lockout and skip shift programs, and established that the car is running rough because of an extreme rich condition in bank 2 (25%) and extreme lean in bank 1 (-15%). Jayson suggested maybe bad O2s or faulty injectors, but couldnt be sure. Any suggestions??
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From: Anderson, Indiana
Re: problems after 1st regular I've seen the extreme opposites on O2 readings a couple of times here in the shop. On both occasions the people had the RIGHT side O2 harness plugged into the LEFT O2 sensor, and the LEFT side O2 harness plugged into the RIGHT O2 sensor. You might double check that.
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91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
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Launching!
Joined: Nov 2002
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From: Houston
Re: problems after 1st regular interesting.........
Sounds like I need to get back in touch with Howell tommorrow, and ask them if they could have possibly wired the O2s backwards in thier harness. I know that I havent switched the sides because the plugs wouldnt reach the sensors if I had, and If I had the whole harness backwards, i.e. left bank injectors plugged into right, and right hand injectors on the left, Im sure it wouldnt even be running....right?
Sounds like I need to get back in touch with Howell tommorrow, and ask them if they could have possibly wired the O2s backwards in thier harness. I know that I havent switched the sides because the plugs wouldnt reach the sensors if I had, and If I had the whole harness backwards, i.e. left bank injectors plugged into right, and right hand injectors on the left, Im sure it wouldnt even be running....right?
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Launching!
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From: Houston
Re: problems after 1st regular John, if you could please give me a little more detail on how this effects the car, I would appreciate it. Also, which bank has the white tracers on the wires, and which side is solid??
Joined: Nov 2001
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From: Anderson, Indiana
Re: problems after 1st regular Typically the striped wires are on the drivers side.
When the O2 plugs are swapped bank for bank, as soon as the PCM tries to correct the fueling based on the O2 feedback info, it corrects the WRONG 4 injectors (bank). While it's still looking at O2 feedback, it doesn't see any effect from the correction, so it corrects even more, but still its the wrong 4 injectors that it is correcting.
In the meantime, the same thing is happening on the other side, usually in the other direction. Needless to say the engine is running terrible after this.
I'm not saying its your problem, but I have seen that a couple of times here, when mail order harnesses were just plugged in wrong.
When the O2 plugs are swapped bank for bank, as soon as the PCM tries to correct the fueling based on the O2 feedback info, it corrects the WRONG 4 injectors (bank). While it's still looking at O2 feedback, it doesn't see any effect from the correction, so it corrects even more, but still its the wrong 4 injectors that it is correcting.
In the meantime, the same thing is happening on the other side, usually in the other direction. Needless to say the engine is running terrible after this.
I'm not saying its your problem, but I have seen that a couple of times here, when mail order harnesses were just plugged in wrong.
__________________
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
Thread Starter
Launching!
Joined: Nov 2002
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From: Houston
Re: problems after 1st regular John, You are the man!!!! I had to cut into the harness and trace the wires back, but it turns out that they were indeed reversed. The white tracer wires were on the passenger side and the solids were vise versa. I owe you one, (how many is that now??) 
If only I had known about Speartech 2 years ago........
thanks -Gordon
Also wanted you to know that you (and alot of other folks helped make it possible for me to take this car out of town to my new school, I thought I was gonna be stuck in my dads truck again.
If only I had known about Speartech 2 years ago........ thanks -Gordon
Also wanted you to know that you (and alot of other folks helped make it possible for me to take this car out of town to my new school, I thought I was gonna be stuck in my dads truck again.