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Prev Professional Automotive Repair Technical Discussions for September 8, 2009
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Open Help Requests for GM
Help Request Answers
2000 Cadillac DeVille 4.6L Poor Idle Quality VIN: 1G6KD54YOY
Vehicle was towed in with a transmission problem that so far we have not been able to diagnose, as there were 8 codes in system, p0108, p0203, p0480, p0748, p1106, p1571, p419. Original recommendation was replace computer because fuel injectors were not activa... Trouble codes: P0108, P0203, P0480, P0748, P1106, P1571
1978 Chevrolet K20 Custom Deluxe 5.7L Poor Idle Quality, Hesitation VIN: CKL248Z165
This truck idles beautifully in park and neutral, but when thrown in gear it bogs down and idles really rough. It also seems to hesitate for a second when giving it gas unless you ease on the pedal more slowly. It has an edelbrock carb and I have tried adjust...
1991 Chevrolet Corvette 5.7L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 1G1YY3387M
Hello all I have this Corvette that is running extremely rich to the point it is fouling out the plugs in a matter of a couple of minutes. Scope pattern looks fine. We have substituted a new MAP sensor, and ran two cans of Seafoam and gas mixture though the fu... Trouble codes: 32 (EGR-replaced and code has not returned)
1997 Chevrolet K1500 Silverado 5.7L axle actuator VIN: 2GCEK19M4V
THis is a reconstructed vehicle. Can someone tell me exactly how the actuator on the front axle is to be wired? Every wiring diagram looks different, and I did not find any that showed the complete diagram when it is changed over from the thermal to the electi...
2001 Chevrolet Blazer LS 4.3L Engine VIN: 1GNDT13WOX
Hi there We have a Chevy blazer that intermitently does not start although it has only happened to us twice & by the time we start to test to see what it is loosing it starts. After non start it flags P1361 in engine control I have found some GM info that sug...
2002 Chevrolet Cavalier 2.2L fule to cng VIN: 301JC52412
well you guys have ben great in the pass so thanks inadvance. well this is for you gm guys first time customer he has cng car dealers went out of bizz new one have open but they wont work on car and he cant find any one els but not much in fo in all data reall... Trouble codes: P1202 (alternate fuel engine control module afecm gass mass sensor circuit low)
2005 Chevrolet Malibu 2.2L Starting VIN: 1G1ND52F25
This 05 malibu have the anti-theft light blinking on the dash all the time with key on, remote working properly locking and unlocking doors. This happen about 4 months ago and we left the key in their with the ignition key on and magically it started and fine ...
2004 GMC Yukon Denali 6.0L tire pressure VIN: 1GKEK63U54
tire pressure light on. all tires at 36 psi. no codes on scanner. scanner reading 17 psi on all tires. all sensors seem to wake up and reset. light stays on all the time. i dont know if i need to take to dealer for complete reprogram. do not have alot of info.

Fixes & Summaries for GM
Fix/Summary Answers
1990 Chevrolet Corsica LT 2.2L hard start VIN: 1G1LT54G9L
First let me thank everyone for all your help.What I found out was at times there was only 9-10 volts from brown and white wire out of the fuel pump relay,then the fuel pump would run slow,less pressure, less volume, long start time until it built up oil press...
1997 Chevrolet S10 2.2L Hesitation, Cuts out, Stall VIN: 1GCCS1948V
Lots of great replies. Sorry i have not had time to close this one out sooner. It was and injector shorting out and shutting down the pcm. Replaced the set and all is well. I should have checked those off the bat. I guess hindsight is always perfect. Thanks f...
1998 Chevrolet Express 3500 5.7L speedometer VIN: 1GCHG35R6W
Hi gang, thanks for all the help. Dennis, Skip & Adedayo hit the nail on the head. The PCM had water intrusion & tons of corrosion. Pulled it up, blew it off with air, & gave it the standard gm computer tap test, & speedo started working fine & trans shifted p...
1999 Chevrolet Blazer 4.3L veh. control VIN: 1GNDT13W7X
This one is fixed,thanks for the many replys 2 replys were right on(You know who you are, Thanks). The fix was to install the idler arm corectly, the mounting holes for the idle arm are slotted and the new idler arm was in the wrong position and the center lin...
2001 Chevrolet Express 3500 5.7L Hesitation, Stall, Misfire VIN: 1GBJG31R31
Thanks to the members who took the time to send in suggestions. We were unable to find any smoking gun. I should have mentioned that the Maf sensor has been replaced also and checks out. On a hunch we plugged the evap line to the valve in the manifold. Even th... Trouble codes: P0131, P0137, P0151.
2001 Chevrolet Blazer LS 4.3L Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GCNCT18W4
Thanks for all the responses turns out is was the ignition tune up as many of you sugested the cap and roter were rotted we found the tsb and punched out the screens in the distributor. This was a different one have never had a misfire this random and self fix... Trouble codes: P0300.
2001 Chevrolet Malibu 3.1L Poor Idle Quality, Surge, Cuts out, Stall VIN: 1G1ND52J61
After much reading and more testing I went ahead and replaced the IC module and one coil for what appeared to be some mild carbon tracking at the towers. After the replacement I scoped the 3X signal and got a nice clean 5 volt square wave, also I noticed on my... Trouble codes: P1374, P1585, P0449, P0443.
2002 Chevrolet Impala 3.8L Lights flashing VIN: 2G1WH55K72
I have proven it was the BCM. But the customer has after market warranty and is taking it to GM to have it installed. Thanks to all who sent me Info. It Helped me to prove I was right.
2004 Chevrolet Silverado 1500 4.8L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1GCEC14V44
well,after a hair pulling time this truck is running fine now.after backtracking myself and checking again i had power on 12 volt reference circuit and signal circuits were good, removed sensor again for the 5th time and checked tone wheel again, had no excess... Trouble codes: P0336.
2006 Chevrolet Impala LT 3.5L Surge, hunting VIN: 2G1WB58K16
The vehicle finally came back for further diag. We had originally check the actuator with the volt meter and it read ok.We also triggered the actuator with the scanner and it worked fine.On th hwy it would surge or hunt up to 23 degrees.The chain and tensioner...
2003 GMC C4500 Topkick C4E042 6.6L No Start VIN: 1GDE4E1193
I am calling this one fixed. Advised customer to take to dealer for second opinion/ further testing due to special tools needed & experience. They said it was the injectors. I check for fuel in oil before I changed the oil & saw nos igns of fuel in oil. I thou...
2002 Saturn L200 2.2L body control VIN: 1G8JV54F32
To summarize my findings -you cannot reprogram a used controller but if you get one from an exactly optioned car it will work -you cannot update the mileage but you can relearn the antitheft info and program the remotes. In our exact case we found a new contr...
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