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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for November 13, 2007
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Open Help Requests for GM
Help Request Answers
1994 Buick LeSabre Custom 3.8L transmission VIN: 1G4HR5219R
Hello all,this car came in today from a good customer.Complaims of running bad and no up shift.this all happened after engine gone hot(intake nipple broken)customer replace himself,after repair he noticed idle was high.after about a minute or so he said it cam...
1992 Cadillac DeVille 4.9L Excessive Emissions, Poor Idle Quality, Misfire VIN: 1G6CD53B2N
This one has us stumped. This Caddy failed E-test. Our test is an IM 240 test. CO is 27 grams per mile with the spec being 20 grams per mile. Scanned for codes, none found. Car has a rough idle and can hear putting noise at tailpipe. Balance test showed #1 and...
1995 Chevrolet C2500 Cheyenne 7.4L Poor Idle Quality, Surge VIN: 1GCGC29N4S
hi guys, i am listing this for my buddies shop. he has this 1995 chevy c3500 pickup that has a hunting idle only while sitting at traffic lights/stop signs, and will only do it once or twice after hot restart and then idles fine. i dont have any spec readings ...
1996 Chevrolet K2500 Suburban LS 7.4L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: 3GNGK26J4T
good evening to all.i dont know where to start but i dont understand the cam numbers and i need help. this suburban cam back with a bad surge at idle,almost as if the key was being turned of then back on.the cam retard was going as high as 30 then may drop as ... Trouble codes: P0340, P0341
2000 Chevrolet Silverado 1500 5.3L Air Bag VIN: 2GCEC19T5Y
Did post collision air bag replacement. Replaced both bags (modules) crash sensor and the SDM. Now sets a code B1001, for "Option configuration error" (no other codes) Ran the GM code chart and says to reprogram the VTD (Passlock) system using the Tech 2 and n...
2004 Chevrolet Silverado 1500 4.8L Starting VIN: 1GCEK14V94
I repaired this truck (changed cab) all original wiring, colum, and modules. Now that its together, I cant get it to start. It will crank for as long as you want when you first turn the switch on but won't crank again unless you turn the switch off and wait ti...
2005 Chevrolet Silverado 1500 4.8L Poor Idle Quality VIN: 2GCEC19VX5
I am hoping some one else has seen this problem or at least can explain. What I have is This chevy truck that during startup the idle flares up to around 2000-2200 rpm, then comes down and during shift from park to drive or reverse it flares to 1000-1100 rpm, ...
2000 GMC Sierra 2500 SL 6.0L door locks VIN: 1GTGC29U3Y
i have a customer who would like to disable the power door locks from automaticaly locking each time when driving and he has to remove the key partially to unlock the doors. also he would like a way to dissable the daytime running lights because its used off r...
1998 Saturn SC2 1.9L Poor Idle Quality, Stall VIN: 1G8ZH1273W
this happens intermintly try to start and will stall out but if you push npedal to clear mode it will start and black smoke until cleared then it runs fine then if you let it sit does the same thing. thinking injectors?
2002 Saturn L200 2.2L Starting VIN: 1G8JU54F22
This one runs us to a dead end. ECM displays a U1000 code (data link malfunction). Checked all basics. Found there is no comunication with BCM. There are no door locks,interior lights, security light or shift interlock. Anyone got a clue?

Fixes & Summaries for GM
Fix/Summary Answers
1988 Buick Regal Limited 2.8L MIL Lamp on VIN: 2G4WD14W8J
Many of you suggested flashing the code old school and that was the answer tyo getting us in the right direction. We pulled a code 63. The original test was to check the EGR, but the revised test procedure changed it to a MAP sensor diagnosis. In performing... Trouble codes: 67 (Unknown).
2001 Cadillac Seville STS 4.6L steering VIN: 1G6KY54951
Sorry for the delay, lots of response on this one some suggested fluid leaking onto belt causing it to slip And tensioner being bad making belt slip suggesting replacing the tensioner and belt which I did just to rule that out. I was also told to check If ...
1992 Chevrolet Lumina 3.1L battery VIN: 2G1WL54T6N
1994 Chevrolet Caprice Classic 5.7L cooling fans VIN: 1G1BL52P5R
My thanks all 6 replies;good information from your experience. It seems that it turns out that someone had been working on this problem before the car came to me and while the cooling fan motor was bad,they didn't find it but managed to install BOTH relays bac...
1994 Chevrolet Astro CL 4.3L Poor Idle Quality, Stall VIN: 1GNDM19Z7R
i would like to thank every one for there help.it turned out to be a broken ground wire behind the left side head where the fuel lines bolt to fix the ground running top notch thanks every one
1997 Chevrolet Express 1500 5.7L noisy fuel pump VIN: 1GBFG15R5V
I did research on the emissions system while waiting for the fuel tank and found that there were no vent solenoids on this vehicle. The fuel tank vents through the charcoal canister. Inspection of the canister found that the vent tube and canister were plugg...
1997 Chevrolet C3500 Cheyenne 6.5L No Start, MIL Lamp on VIN: 1GCHC39FXV
Thank you for all the help as it turned out the injection pump was bad even though the customer had it replaced 1 month ago in a different town on his last trip, glad to see he went to the dealer so it was still under warranty also GM has extended warranty on ... Trouble codes: P0251 (Injection Pump Cam System), P0370 (Timing Reference High Resolution).
2001 Chevrolet Blazer LS 4.3L MIL Lamp on VIN: 1GCNT18W51
thanks for all the help, i did check all wiring from computer to sending unit, i am leaning towards cluster or wiring going to it . waiting for customer to return truck when not in use. thanks againe eveyeone Trouble codes: P0463 (fuel level sensor high 5 volts).
2002 Chevrolet Monte Carlo LS 3.4L No Start VIN: 2G1WW12E32
All suggestions are appreciated, but vehicle has not acted up and customer picked car up with plans to get rid of it. So I was not able to fix it. Will post update if anything changes, Thanks again. Trouble codes: P0336 (ckp sensor ckt), P0716 (input shaft speed sensor performance prob), P0717 (input shaft speed sensor low/no signal), P1189 (engine oil pressure switch problem), P1811 (transmission internal mode switch malfunction).
1999 GMC Jimmy SL 4.3L abs VIN: 1GKDT13W4X
unfortunatley, the customer decided they did not want to invest any money into repairing to abs system unless it was inexpensive. I did receive many great suggestions on the problem though. After going over wiring diagrams and suggestions, I believe also tha...
1993 Oldsmobile Cutlass Ciera 3.3L Ignition
I recieved a lot of helpful replies...Ended up replacing the computer. The car ran fine for 3 days--drove it back and forth to the shop--about 5 miles each way. I called the customer and when he came to pick it up- Guess What?? It would'nt start!!That was it, ...
1997 Oldsmobile Achieva S 2.4L security VIN: 1G3NL52T6V
Most of the replies involved problems with ignition switch, key or cluster not recieving key signal(wireing problem). Several replies said to repeat programing proceedure which I had cusromer do and was told it worked, was able to start vehicle. As I have not ...
1998 Oldsmobile 88 Royale 3.8L No Start VIN: 1G3HN52K0W
I scoped the crank sensor the first time it came in and had a ok pattern. I also scoped it his time with a fair pattern. I replaced the crank sensor to try to get a better pattern and also found some bent teeth on the balancer. I also found a cheap aftermarket...
1999 Pontiac Sunfire SE 2.2L Excessive Emissions VIN: 1G2JB5244X
yes we finally we fixed this sunfire.I thank all u that helped me solve this problem.the real problem that the wires going to the ecm were mostley corroded.Do to a right inner fender shield being cracked water and ontario salt going in causing corrotion.I repl... Trouble codes: P0405 (exhust gas recirculation valve sensor signal low).
2000 Pontiac Grand Am GT 3.4L engine VIN: 1G2NW52E5Y
removed and replaced water pump. didnd see anything wrong withpump. replaced thermostst a second time. i believe the radiator cap fixed concern. car was building up alot of pressure. when cap was replaced it didnt build up any pressure until it got good and ho...
2005 Saturn Vue 2.2L Misfire, MIL Lamp on VIN: 5GZCZ23D35
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