× 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 March 20, 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
1992 Chevrolet S10 2.8L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, Poor Fuel Economy VIN: 1GCCS14R1N
Hello,I have this truck in for repair that the firing order is not correct.Firing order should be 1-2-3-4-5-6 but the only way this truck will run is on firing order 1-6-5-2-3-4.Customer has replaced spark plugs,spark plug wires,cap and rotor because he says h...
2000 Chevrolet Blazer LS 4.3L No Start VIN: 1GNCT18W9Y
i drove vehicle in and removed old engine. now with salvage engine in i cannot get to start, no injector pulse. will start briefly with help of starting fluid. swapped cam sensor from engine that ran.. changed crank sensor... i am wondering if security system ...
2001 Chevrolet Silverado 2500 HD 6.6L Drops to neutral VIN: 1GCHK23181
I have this K-25HD w/Allison that will drop to neutral at stops. All other shifts fine. The shift indicator on dash never drops out or flashes, always reads correct, no trans codes. I replaced the shift position switch on the side of the trans with a factory n...
2004 Chevrolet Express 3500 LS 6.0L front end shake VIN: 1GAHG39UX4
Good morning, I have this van that has a shake in front end above 35 mph when brakes are applied. As I stated earlier I replaced both idler and pittman arms like I done on many of these vans. I put my big pry bar on every point under front end and everything i...
2004 Chevrolet Avalanche 1500 Z66 5.3L transfer case VIN: 3GNEK12T24
Greetings. We have a service 4x4 light that will come on when it feels like it.Sometimes 2-3 times a day then maybe not for for a week or two.No codes and it resets as soon as you shut vehicle off and restart again. Any insight would sure be appreicated.Thanks...
2005 Chevrolet Silverado 1500 4.3L No Start VIN: 1GCEC14X05
hi all tech out there i need help this one car tow in no start check spark ok no fuel pressure replace fuel pump run fine 2 week later tow back went out to check it start up fine recheck fuel pressure it fluctuate at 65 acceleate it smooth out it all data does...
2006 Chevrolet Trailblazer LT 4.2L No Start, Stall, MIL Lamp on, reduced engine power VIN: 1GNDS13S66
We have an 06 trailblazer with complaints of intermittent no crank, intermittent stall( any speeds). We experienced the no crank 1 time, vehicle then started and has not failed to not crank again. After bringing the truck in shop to check no crank, reduced eng... Trouble codes: P1516, P1682, P2610
1991 Pontiac Firebird 3.1L Hesitation, Cuts out, Stall VIN: 1G2FS23TXM
Code 43 was set due to knock sensor unplugged. Fixed that & now car will idle, no codes, but nearly dies when you press gas. If you feather gas, you can build up speed slowly. I cleaned tbi, egr, iac, and it did nothing. It also backfires through the intake an...
1998 Saturn SL 1.9L Hesitation VIN: 1G8ZF5282W
The customer is complaining of a stumble of hesitation under load at about 2000 rpms in 4th or 5th gear. Test drove and verified concern, power just drops out at 2000 rpm and seems to stumble until the load decreases. Under or over 2000 rpm the vehicle is fine...
2004 Saturn Vue 3.5L trac system VIN: 5GZCG534X4
The trac light comes on when you put it in reverse or low range. There are no codes stored. When we checked alldata they say check it with the trac switch. It doesn't have a trac switch. Has anyone come across this?

Fixes & Summaries for GM
Fix/Summary Answers
1995 Chevrolet C1500 5.0L Hesitation, Surge
Thank you for everyone that replied to this problem, what i found was actually 2 separate problems, the first problem was the off idle surge, stumble which was the egr valve had a weak spring. the second problem was a hardstart when hot which was the map senso...
1997 Chevrolet Lumina 3.1L battery VIN: 2G1WL52M9V
THANKS TO ALL!! problem turned out to be radio, what did throw us off was modules took 45 min to an hour to go to "sleep mode"
2000 Chevrolet S10 2.2L MIL Lamp on VIN: 1GCCS1456Y
thanks for help,, evrybody nailed it blown fuse with water problem,, now i know just a little bit smarter next time I see one of these thanks again bill [...]
2001 Chevrolet Silverado 1500 5.3L headlights & multifunction VIN: 2GCEK19T11
We fixed problem by adding a larger ground wire right at switch and repaired old switch.
2003 Chevrolet Silverado 1500 5.3L steering gearbox
Thanks for the help on 2003 Chevy,but the GM dealer was the only place with the 680 gearbox.
2003 Chevrolet Express 2500 6.0L Poor Idle Quality VIN: 1GCGG29U93
We got this one fixed finally, the culprit was a broken wire 1/8" from the connector. The isulation was completely intact, just broken inside and making itermitant contact. Thanks to all who replied, joeseph from NY was bang on the money. Another fix for IA... Trouble codes: P0507.
2004 Chevrolet Silverado 2500 HD 6.6L left inner shaft VIN: 1GCHK29114
morning guys thanks for all the input we had to build a larger slide hammer it finally came out can't beleave we did not damage any thing. runs down the road just fine thanks again IAN
2006 Chevrolet Monte Carlo LT 3.9L traction con VIN: 2G1WK15196
thanks to all those who replied.the fix was a reflash on pcm,it would be nice if gm would tell you all the things the reflash addresses,it did not say anything about traction control problems,lesson learned, always install latest programing,dont even want to c...
2007 Chevrolet Avalanche LTZ 5.3L Low oil level VIN: 3GNFK12397
Thanks for the responces Mike,Alex nailed it grounded signal wire lite went out switch was bad thanks again IAN ROCKS!!!
1998 GMC K1500 Sierra SL 5.0L Excessive Emissions, Poor Idle Quality VIN: 2GTEK19M0W
Ihave to thank all the tech,s. who helped me .first I replaced the fuel reg. while taking upper intake off ,I tried blowing back in the return line with comp. air . The line was blocked ,so on further inspection with a bore scope I saw that some one previously...
1999 GMC Sonoma SL 4.3L No Start VIN: 1GTCS14X8X
13 of you were right on!!! replaced electrical portion of ignition switch and all is fine.thanks so much to all that responded.
1999 GMC Sierra 1500 SLT 5.3L Misfire VIN: 2GTEC19T7X
thanks to all and sorry for the delay of posting the fix.as many of you said smoke the intake.when i did smoke can out of the 2-4-6-8 side.replaced the gaskets and drove it around for a day all is fine.what would have lead me to the intakes first if i would ha... Trouble codes: P0300 (random misfire), P0463 (fuel level sencor high or open).
1995 Oldsmobile Cutlass Ciera 3.1L Poor Idle Quality, Misfire, Idles hi VIN: 1G3AJ55M4S
HI Y'ALL! I sent this back to shop who put heads on . THey found used ecm (I didnt want no part of that). He must have found a good one. He told me that took care of problem. I had pulled tb and it was full of oil from pcv? And carboned up on the side where ... Trouble codes: 122 (tps low), 123 (tps hi), 112 (air temp low), 101 (mass air fault), 131 (o2 low).
1990 Pontiac Grand Am LE 2.5L Misfire, Back fire VIN: 1G2NE14U5L
Thanks everyone, 8 of the reply's were right on the money, I replaced the spark plugs with AC Delco and wires and could not get the car to act up again. I found the wires not routed properly and found what appeared to be a crack in one of the spark plugs. Oth...
2005 Pontiac Grand Prix GT 3.8L Pan Gasket VIN: 2G2WS52225
Well you all were mostly right.We missed the oil seal holder gasket($7.00 part)Out came the tranny again,installed gasket & all is well!Another lesson learned! Thank you all for you input! Darren D&J Automotive
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next