× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for December 23, 2009
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM
Help Request Answers
1993 Buick LeSabre Limited 3.8L No Start VIN: 1G4HR53L7P
Customer took battery out and car hasn't started since. I have spark and initial injector pulse then looses injector pulse.Checked wiring and did scratch test. All seems to be okay. I can unplug all injectors and have pulse. Plug one injector in and loose puls...
1993 Buick Century Custom 3.3L Starting VIN: 1BU1C12345
I have one here that is really stumping me. This Buick was towed in for a no start. Quick check had spark, weak! Fuel injector pulse. No codes. Installed new crank sensor, no help. Removed found plug gap at .090. Plugs, & wires had not been changed. Installed ...
2000 Buick LeSabre Custom 3.8L Accessories VIN: 1G4HP54K1Y
This is the wifes car so... She went to turn on the road and it died. Lost all power completely. I have no lights, anywhere, key on produces nothing. No chime or dash lights when turned to run or crank position. Removed rear seat and tested Battery. it passed ...
2000 Buick LeSabre Limited 3.8L i.p.c. VIN: 1G4HR54K1Y
the problem is that the instrument cluster goes wacko. various warning lites come on and gauges quit working. this seems to only happen when the alternator is charging 15 volts or more. have replced the i.p.c. & the ignition switch. we've also tried a new alte...
1994 Cadillac Seville STS 4.6L Alternator VIN: 1G6KY5290R
Car came to shop with ChkEng Lt on and message center giving high voltage. Hooked up tester,monitor charging system,14.5v and 30amps but then it will spike to 17v with no change to amps[30amps] for 10 to 30 seconds and fall back to normal. This car has had bat...
1998 Cadillac Seville STS 4.6L no start VIN: 1G6KY5494W
Hello, the boss is away and his relative had this car towed here and they want it yesterday. The story is, car would not start for them 2 days ago and before the tow truck came he tried to start it and it did start. So instead of bringing it to the shop he jus...
2003 Chevrolet Silverado 1500 LT 5.3L headlights VIN: 1GCEK19T53
headlights will go out on high beam and then low beam never lose marker or tail
2004 Chevrolet S10 LS 4.3L transfer case #233 VIN: 1GCDT13X04
hi thanks for reading this and trying to help. truck came in hard to get into 4wd.system is just straight 4wd push button 2h,4h,4l, transfercase #233. grinds when you try it may take 3to 6 times but it will go in. found out of fluid install new fluid and insta...
2005 Chevrolet Suburban 1500 LT 5.3L heated seats VIN: 3GNFK16Z45
Cannot seem to be able to fix the heated seats on this truck.Both front heated seats will work for about 5 min and then just shut off.Tech 2 data says they are still on but the light indicators on the switch go off and heaters quit heating.All heating elements...
2007 Chevrolet Cobalt LT 2.2L air bag light VIN: 1G1AL15F37
have code b0081.while reading thru troubleshooter,found the passenger presence system runs thru rear view morror.car has aftermarket windshield,mirror and drivers side glass. anyone had the pleasure of messing with this
2002 GMC Sonoma SL 4.3L Misfire VIN: 1GTDT19W72
po300 checked fuel pressure and found low, replaced fuel pump. fuel pressure at 56 psi. still had misfire replaced fuel injector spider rail. installed cap,rotor, plugs , wires, and found still a little misfire. found clogged converter and replaced. vehicle re... Trouble codes: 306 (cylinder 6 misfire)
2002 GMC Sierra 1500 Denali 6.0L No Start, Stall VIN: 2GTFK69U32
2002 sierra 6.0, towed in, no start. Customer states it died on the road. After it cooled down, it restarted then died after 5min. They then installed plugs and fuel pump to no avail. What Ive found: Fuel pressure 60psi, No Spark, No injecter pulse, No codes ...
2000 Oldsmobile Intrigue GL 3.5L No Start, Stall, MIL Lamp on VIN: 1G3WH52H8Y
Intrigue acting strange. At first problem was intermittent. Car would die randomly driving down the road,all dash lights would be flashing, vehicle would not start when lights flashing, once lights stopped flashing vehicle would start. Problem went away for ab... Trouble codes: B1422 (BCM Power malfunction)
2003 Saturn L300 3.0L timing belt VIN: 1G8JL54R34
This vehicle came in for a timing belt, as maintenance not due to failure. The shop did not setup the original belt on the timing marks. After installing the new belt, it was found that the left head has two timing marks on each camshaft gear. The part number ...

Fixes & Summaries for GM
Fix/Summary Answers
2003 Buick LeSabre Limited 3.8L Cuts out, Stall VIN: 1G4HR54K33
Thanks To Everyone That Replied, I Tried Several Times To Have Customer Return The Vehicle To Check Some Of Your Ideas. Unfortunatly The Vehicle Was Traded In On A New Vehicle. I Was Very Disappointed I Really Wanted Find Out What Was Wrong... Thanks Again For...
1990 Chevrolet C70 C7D042 7.0L Misfire, BACK FIRE VIN: 1GBL7D1E7L
Many thanks to those that replied to my post, the fix was to replace power valve in the carb, removed the Carb and replaced the gaskets and power valve, test drove and it has fixed the problem. My hat is off to Ken from Illinois who knew of this problem.
1993 Chevrolet K1500 WT 4.3L Hydraulic System VIN: 1GCEK14Z4P
This truck is finally fixed. I lost money on labor but am happy to have resolved the problem, thanks to iATN. After pulling the trans and clutch (bell)housing I removed the release fork from the pivot stud and found the stud worn excessively and the fork cra...
1998 Chevrolet Astro 4.3L No Start, Stall, Misfire VIN: 1GNDM19W5W
Hello, I have confirmed the cause of the problem and awaiting customer's approval; so, I will close this request with the confirmed diagnosis. First, you were all a great help and I would like to thank you. Although you may have not pinpointed the problem, y... Trouble codes: P0300 (Multiple Cylinder Misfire).
2003 Chevrolet Avalanche 1500 5.3L speedo cluster VIN: VN08110122
we replaced the speedo cluster and finshed replacing the 4x4 module sensor and also replaced the leaky seal. make note we also replaced the 4x4 switch on the dash first and that did not help. the dealer had to re program thanks for all of the help Mike
2003 Chevrolet Blazer LS 4.3L radio VIN: 1GNDT13X43
Thanks for all the help on this one. I found a web site that was a great help www.termpro.com I used a am radio and traced the noise to the distributor cap. We replaced the cap and all is well the cap had been arcing but not enough to cause andy drivabilty pr...
2005 Chevrolet Cobalt 2.2L Mechanical VIN: 1G1AK12F55
Customer called the dealer where he purchased the vehicle and they decided the transmission needed rebuilding and was going to give a partial warranty.
2006 Chevrolet Trailblazer EXT LT 4.2L po894 VIN: 1GNET16S26
I replaced the TCC sloenoid as many of you suggested and so far the Code has not returned. I am calling this one fixed, I hope!! Happy Holidays and Thanks for the help
2008 Chevrolet Silverado 1500 LT 4.8L abs VIN: 1GCEK14C38
Thank-you for your replies. After exhausting testing on the rear wheel speed circuits and associated data/replicated circuits the issue came down to signal stregnth from the rear speed sensor. Testing the signal as per GM info the signal tested OK. Freq of 25...
2008 Chevrolet Silverado 3500 HD WT 6.6L front brakes VIN: 1GCJC33678
most said problem at trialer brakes , all new parts and tried a new trailer and problem still there . Customer took truck. thanks for all your help.
1999 GMC C3500 Sierra SL 5.7L No Start VIN: 1GDJC34R8X
Thank you everyone for your replies. They were a great help when it seems hopeless. The front fuel pump was OK. The tank was empty. It turns out that the module which monitors the twin tank system was the culprit. The driver was mislead into driving until ...
2003 GMC Sierra 2500 6.0L Surge VIN: 1GTGK29U33
Vehicle has not returned as of this time, tech posts were, normal problem when cold that you can't accelerate , this is prorammed into the ecm called catalytic light off, it holds the timing back to create heat for cat as coolant temp reaches 140deg, hook scan...
2003 GMC Sierra 2500 HD 6.0L Parking brake, high beam lights dimmly glowing VIN: 1GTHK29U73
I started by removing the pin at the ipc (gray) serial data stream hi beam indicator and parking brake warning bulb no longer illuminated brightly when circuits were energized but did continue to faintly glow and battery draw was still present. So i took the...
2004 GMC Sierra 2500 HD 6.0L Misfire VIN: 1GTHK29U14
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next