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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for February 1, 2008
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Open Help Requests for GM
Help Request Answers
1990 Chevrolet V2500 Suburban Scottsdale 5.7L Torque converter VIN: 1GNGV26K9L
This vehicle feels like the torque converter is not working properly...that is, not multiplying torque well. Full throttle start is very sluggish but seems to "wind out" well after the truck has moved down the road a few yards. Engine seems to have adequate po...
1997 Chevrolet Monte Carlo Z34 3.4L Hesitation, Cuts out, Misfire VIN: 2G1WX12X6V
hey guys and gals...problem child...no history/bought at auction...now i know why...cuts out at 3100 to 3200 rpm ALWAYS!!!acts like rev limiter..i know there's one in park and neutral...not supposed to be when driving...trans data...4 pids([...]/2xo volts)...
2005 Chevrolet Astro 4.3L rear turn signals\brake lights VIN: 1GCDM19X35
Hi again folks-this one seems to not have a mechanical answer.This Astro Van eats rear turn signal\brake light bulbs.It is a Fleet van used to repair business machines.There are no racks or anything in the back & it is not loaded up with material.We have teste...
1997 Pontiac Sunfire SE 2.2L whistle VIN: 1G2JB1247V
this sunbird came in with mil on and a whistle from engine at idle. mil code was 1336 - crank synch. performed relearn per gm procedure and road tested good. no codes no problem. however at idle speed, most times, there is a very annoying whistle from i think ...
2000 Pontiac Grand Am GT 3.4L Stall VIN: 1G2NW12EXY
This car will shut down while driving down the road.When it shuts down the speedo quits also even though you are still moving.If you wait 5 mins. It will restart and run for a few miles then do the samething all over again. It has no codes.
2004 Pontiac Grand Am SE1 3.4L security VIN: 1G2NF52E14
customer stated security light,brake light,service vehicle soon light on. customer went to work came out later,no start (no crank) has a new battery. something in the security system. Please help-desperate
1994 Saturn SC2 1.9L hard start cold VIN: 1G8ZH1574R
cust complaint hard start mostly cold checked found temp sensor signal jumping from 0 to 75000 deg. f checked harness and connection ok removed pins from ecm still jumps replaced ecm with boneyard problem the same. checked voltage and ground at ecm ok. if temp...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Chevrolet Cavalier 2.2L Starting VIN: 1G1JC1249T
this vhicle was fixed with a new lock cyl and key. think you all vary much,
1998 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNDT13WOW
Well, tough one to follow up on as I don't know what actually fixed this vehicle. Most responses pointed towards fuel injector, fuel pressure regulator, or fuel line leaks. As I indicated, I checked these items twice without finding a problem... and this eng... Trouble codes: P0300 (Random cylinder misfire).
2002 Chevrolet Trailblazer LS 4.2L Cuts out, Stall, MIL Lamp on VIN: 1GNDT13S82
We could not find anything except a possible PCM problem. We replaced it and gave the vehicle back to the customer. Hopefully. this will resolve this very intermittent problem. We shall see. Thanks for all of your replies! Trouble codes: P1271 (APP Sensor Correlation Error), P1635 (5 Volt Reference A Low), P1639 (5 Volt Reference B Low).
2005 Chevrolet Express 1500 5.3L Starting VIN: 1GBFG15T85
Well the Van is sent down the road. We ended up replacing the ignition switch(We did see 1 burnt contact point & are hoping this was it) - We also put in a new starter relay. So far after 2 days it has started every time. Thanks for the responses guys(all were...
1993 GMC K2500 Sierra 6.5L No Start, Stall VIN: 1GTGK29FOP
Believe it or not, this ended up being a complete box of bad glow plugs. I replaced all eight glow plugs, and the truck now starts normally. Sure was a head scratcher since the plugs all tested ok.
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