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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for February 21, 2005
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Open Help Requests for GM
Help Request Answers
2003 Buick LeSabre Custom 3.8L MIL Lamp on, VIN: 1G4HP52K23
we have a nice lesabre with no problems other than evap performnce genisys says vacuum excessive. there are no restrictions in any lines to and from canister vent valve, vacuum solenoid. pulled top off trunk no damage and ftp sensor always reads .22 but ftp is... Trouble codes: P0446 (evap vent performance)
1992 Cadillac DeVille 4.9L No Start, Poor Idle Quality VIN: 1G6CD53B1N
I have a good one here!!! This car came in for a no start. You can tell that someone has been working on it before i got it. the starter, alternator, and tuner up has been done. I have proper fuel pressure, but fire is not right. It would one spark one time wh...
1990 Chevrolet Corvette 5.7L No Start, Cuts out, Stall VIN: 1G1YY2385L
I'm trying to help an engine shop that did this engine install, but is unable to make it run. On initial cold start, it runs normally. After about 15 seconds or so, it dies, restarts, dies and so on. The longer this scenario goes on, the less time it runs and ... Trouble codes: 43 (Electronic Spatk Control)
1993 Chevrolet C3500 Silverado 6.5L overdrive VIN: 1GCHC33FXP
I Have a 4L80e trans that will not go into overdrive periodically, Had this problem before where I could turn off the engine for 30 seconds and it would shift correcty, or I could unplug the tcm to make it shift. But now that doesnt work anymor. When shifting ...
1994 Chevrolet Caprice Classic 4.3L MIL Lamp on VIN: 1G1BL52WXR
vehicle has code 26 present. replaced computer had reprogramed,code came back in one day.checked wiring harness and grounds.checked all sensor voltages.everything checks normal.please help. Trouble codes: 26 (quad driver moduler 1 faut)
1996 Chevrolet K1500 Cheyenne 5.0L MIL Lamp on VIN: 1GCEK19M1T
This truck keeps setting codes O0172 and P0175. We did a set of plugs and an ignition coil for maintenance. Fuel pressure is in specs and holds great. Here are some numbers from a freeze frame on the P0175 load 3%, coolant temp 198, ST trim 118, ST-1% -7.8, LT... Trouble codes: P0172, P0175 (B2S1 rich)
2001 Chevrolet Silverado 2500 6.0L Rear seal VIN: 1GCHC23U71
We have an oil leak between transmission and engine. We suspect rear seal and or rear seal housing? Can this job be perfomed without special tools and if so, how?
1997 Geo Tracker 1.6L Drive Cycle VIN: 2CNBJ1364V
This vehicle came in for routine service, including a new battery. Soon after the customer went for State Emission inspection, and failed because not all the OBD II systems had reset to the Ready mode. The customer has driven the car for @ 300 miles both on th...
1992 Oldsmobile Cutlass Supreme 3.4L Excessive Emissions, Poor Idle Quality, Surge VIN: 1G3WR11X5N
I am unable to get the NOx to come down any further... the car has failed the Nox part of the test 3 times now it's better but still twice the limit.(limit- 408 reading 818)When i first started the Nox was reading somewhere around 1580... way over the limit. i... Trouble codes: 33 (EGR Valve Malfunction)
2001 Oldsmobile Alero GL 3.4L r/frt sensor VIN: 1G3NL52E91
thanks for reading this posting - this 2001 alero has abs/trac -check eng lights coming on - at first it showed right front sensor open - check sensor and wiring from module while flexing wires it had [...] both front sensors matched resistance - rear senso...
2002 Oldsmobile Alero GL 2.2L Hesitation, Stall, MIL Lamp on VIN: 1G3NL52F93
fuel pressure and flow checks ok so does o2 sensors ,injectors and converter Car acts like it is running out of gas only does it on occasion. Any ideas as to what im missing? Trouble codes: P0171
2003 Saturn LW300 3.0L timing belt VIN: 1G8JW84R83
hey group hope some of you guys can answer this one . this car came to us after beeing in low "dirty flood water" and when eng is turned by hand it feels like piston are touching the valves but it turns trough by hand with only slight resistance, removed all t...

Fixes & Summaries for GM
Fix/Summary Answers
1988 Chevrolet C1500 Cheyenne 5.7L Excessive Emissions, Cuts out, Stall, Poor Fuel Economy VIN: 1GCDC14K3J
thanks to all that replied. what wound up fixing the truck was getting a computer and prom from a truck that was originally a 305 instead of a 350. several guys suggested the injectors were incorrect for a 305, i had already thought of that and switched the wh...
1989 Chevrolet S10 Blazer Sport 4.3L Poor Idle Quality, Surge, Cuts out, Stall, MIL Lamp on VIN: 1GNCS18Z4K
well guys i finaly got this one fixed and on the road again. fist thing i done was fix the code 43 for the electronic spark timing, so that i could be sure that this was a not part of the problem. as i suspected it was not. I replace ecm because the injectors ...
1995 Chevrolet Cavalier 2.2L Poor Idle Quality, Misfire VIN: 1G1JC5244S
Thanks to all that took time to reply, I had replys indicating intake leaks, map sensor and EGR valve (I didn't think of checking the EGR untill the replies), coils Plug wires & jumped timing. We already recommended plug wires (David indicated this one) All ...
1999 Chevrolet Silverado 1500 4.3L Poor Idle Quality VIN: 2GCEC19W9X
Thanks to all who put their two cents in for my problem '99 Silverado. This truck left my shop to go to a transmission shop.The customer told me it was the torque converter. I didn't talk to the tech who fixed it so I can't be a 100% sure, but when it left her...
1999 Chevrolet Tahoe LS 5.7L Hesitation, Surge, Cuts out, Misfire VIN: 1GNEC13R2X
This vehecle is fixed! First, let me try to clear up the misinformation that I gave in the original post. This engine would run fine right up to about 2500 rpm. If I quickly accelerated from there, that is when the scope would flatline. The injector grounds on...
2001 Chevrolet S10 4.3L ABS Fault VIN: 1GCS19W718
Thanks for all the help guys!!! Yes it was a poor ground right behind the left cylinder head. It was a very difficult ground to gain access to, let alone clearly see. Vehicle came back today for an un-related service, the customer informed me that none of the ...
1993 GMC Jimmy 4.3L Poor Idle Quality, Surge VIN: 1GKCS13W3K
Thanks for all the help. Put new EGR valve and that did the trick. no reported problems since then. Only one time did I see the egr actually stuck open, so I replaced it and its doing fine.
2000 GMC Savana 3500 5.7L battery light VIN: 1GDJG31R6Y
Unfortunately could not reproduce the problem, but thanks for the replies. We did try a few fixes offered by members, so we'll see if the problem returns. Thank for all the help, Troy.
2003 Hummer H2 6.0L Starter, low battery VIN: 5GRGN23U43
Thanks again to Iatn I think I've finally got this intermittent parasitic draw repaired on this 2003 H2. George from Illinois suggested TSB 03-08-50-014 which refers to driver's seat wiring that chafes & instructs to remove seat & insulate/reroute wiring as ne...
1994 Oldsmobile Cutlass Ciera 3.1L Poor Idle Quality, Misfire VIN: 1G3AG55M5R
well i have been known to miss a few small things but it turned out that one of the egr's pintle was stuck open just enough to cause the rough idle. i can't believe i missed this. i have done many of these on 4.3 v6's and some other gm engines but never figure...
1995 Pontiac Grand Prix SE 3.1L Poor Idle Quality, Misfire VIN: 1G2WJ12MOS
I learned two very valuable lessons with this one. It doesn't matter what YOU think, listen to this group. They are the best techs in the world. Second lesson, even if the filter baskets are perfectly clean and you pulse the injectors and they appear to be wor...
1997 Pontiac Grand Am SE 3.1L Poor Idle Quality VIN: M6VC710466
thanks guys for the help, found a bullitin in 97 on this problem, install original parts and sent to dealer for update, manager wanted to replace computer, while he was out to lunch one of the techs updated the computer and have drove it for a few days with no... Trouble codes: P0121.
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