× 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 February 7, 2008
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
1997 Buick LeSabre Custom 3.8L pcm/ vats VIN: 1G4HPS2K5V
This vehicle was driven in due to an intermittent cranks but no-start, or starts then dies symptom. Several days of operating the vehicle failed to yield symptoms, however, codes P1626 and P1629 were stored in the PCM. At that time we had the VATS module repla...
1998 Buick LeSabre Custom 3.8L Poor Idle Quality VIN: 1G4HP52K6W
hi gm techs.I have a car here im not sure of.2 days ago came in with heater not working.Found radiator 1 gallon low on coolant.filled with water and heater started working fine.replaced radiator because of small leak at seam.Water pump has small leak but didnt...
1994 Chevrolet Camaro 3.4L Hydraulics VIN: 2G1FP22S0R
We have tried several methods to bleed the air from the clutch hydraulics in this Camaro. Method (1) We attached a vacuum pump to the reservoir through a small container and pulled vacuum, allowing the vacuum to remain on the system for 5 minutes. This is what...
1996 Chevrolet Lumina LS 3.4L Poor Idle Quality, Surge, Cuts out, Stall VIN: 2G1WN52X2T
the car came in with a complaint of dieing out and hunting idle we checked for vacuum leaks and found the pcv hose under the intake leaking so we replaced it no change so we than checked and replaced the timing belt do to it missing about half the belt it was ... Trouble codes: P1642, P1441, P1401, P0441, P0300, P0135
1998 Chevrolet Astro 4.3L No Start VIN: 1GCDM19W2W
Truck came in won't start, customer want to tune up if needs. Charge battery, cranked up, starter & flywheel rear noisy, found flywheel missing teeth, Found TSB about this problem. Replace flywheel, starter with new crank sensor part #[...].Still the same, ... Trouble codes: P0338 (no hard start backfire Kickback during crank grinding.)
1999 Chevrolet Tahoe LS 5.7L No Start VIN: 1GNEK13R8X
Have checked evrything and the solution is cultivating in my mind. It has 61 psi. fuel pressure, spec. is 60-66 psi. It has good spark, injector pulse and the injectors ohm good. There are no codes. This is the part that gets me tho, I tried to flow the inject... Trouble codes: N0NE
2000 Chevrolet Malibu 3.1L Poor Idle Quality, MIL Lamp on VIN: 1G1ND52J1Y
This is about to drive me crazy, and it's not a long drive. Car came in with the P0336 code and I began by looking at a flat line on the lab scope. Went to MOD where they said to disconnect the 24x ckp, turn the ignition on and measure voltage between ground a... Trouble codes: P0336
2004 Chevrolet Malibu LS 3.5L door locks VIN: 1G1ZT54844
car came in with dead battery and a complant of locks tring to unlock randomly on it's own. After replacing battery car came in 2 days later with locks acting up. Ohmed wiring from door switch to bcm - it is good. Customer than told me the odometer keeps switc...
2002 GMC Envoy SLE 4.2L MIL Lamp on VIN: 1GKDT13SX2
Got a real strange one here I am hoping some of you may have seen before. This car has a leak somewhere in the evap system that will leak under vacuum, but not pressure. We have smoked to no avail and found nothing, replaced both the evap and vent solenoids ... Trouble codes: P0442 (Small Evap leak)
2002 GMC Envoy SLE 4.2L transfer case clutch VIN: 1GKPT13S72
This truck came in with code c0327 which related to the transfercase encoder circuit. After testing we found that the encoder voltage was to high due to the transfer case lever going past its max travel (broken clutch) . Got another t-case from rebuilders. To ...
2004 GMC W3500 Forward W3S042 6.0L wont crank VIN: 4KDB4B1U24
OK this is one of the GMC/Isuzu cab over box trucks with 6.0 gas and it wont crank. Wiring diagrams for this unit are not playing out like I thought. I have traced both wires fron starter relay back and both go up front, a black/red goes to neutral switch, whi...
2003 Oldsmobile Alero GX 2.2L no start VIN: 1G3NK52F33

Fixes & Summaries for GM
Fix/Summary Answers
1996 Cadillac Seville SLS 4.6L every thing electrical VIN: 1G6KS52Y4T
We just remounted the ground cable and couldn't duplicate the problem, very intermitant. It's been almost 2 weeks and the car hasn't come back.
1995 Chevrolet S10 LS 2.2L Misfire VIN: 1GCCS1941S
To all the great techs in IATN land; First of all thanks to all that replied to my request; I had 16 good helpers! I know you are all waiting to find out what fixed it; so we will cover that first. Alot of you that answered were still leaning toward bad inject... Trouble codes: 44 (lean exhaust).
1996 Chevrolet Tahoe LS 5.7L Cuts out VIN: 1GNEC13R9T
Thanks to all who responded.Alex hit it on the head.I double checked the injectors and found 5 & 7 crossed.I never would have thought this miss as sharp and pronounced could have been caused by that.Thanks again!
1997 Chevrolet C1500 5.7L Cuts out, hard cranking VIN: ZGCEC19R6V
Hey guys, Thanks for the overwhelmingly great help on this one. I ended up finding the distributor housing cracked where the cap bolts on at. Both of those holes were cracked and not letting the cap clamp down right allowing unwanted moisture inside on the ex...
1999 Chevrolet K1500 LS 5.7L drive train VIN: 2GCEF19R6W
Replaced distribitor Relutor was bary nicking the cmp I am guessing but because the distributor is telling the transmission info It would cause a bad jerk. Thanks for everyone help
2001 Chevrolet Silverado 2500 6.0L Misfire, MIL Lamp on VIN: 1GCGC24U11
This truck came back to me yesterday with the same codes and a slight miss at idle and when opening the throttle. Once again it was No.7 that was the main culprit according to the scanner. If I disabled 7 altogether (spark) no. 2 would also count so I think 2... Trouble codes: P0300.
2001 Chevrolet Blazer LS 4.3L transfer case VIN: 1GNDT13W71
Thanks for all the help, the customer didn't bring the Blazer back until this week but it's fixed. The Encoder motor was bad, in fact I think the contacts were stuck in between 2-Hi and 4-Hi. I've taken Lane from Michigan's advice and I keep an extra motor o...
2002 Chevrolet Avalanche 1500 5.3L rear diff VIN: 3GNEK13T22
the ring and pinion turned out to be the problem,the gear surface was rough on one side but not the other so i replaced them and all is well.thanks again.
2006 Chevrolet Suburban 1500 Z71 5.3L MIL Lamp on VIN: 1GNEC16Z16
Thanks to all that replied. Bill from Pennsylvania, Alex from Georgia and Scott from British Columbia were correct in thinking it was a Flex Fuel concern. We deceided to take the vehicle to the Dealer for their diagnosis. They first cleaned the injectors then ... Trouble codes: P0172 (Fuel Trim Rich Bank 1), P0175 (Fuel Trim Rich Bank 2).
2005 GMC Canyon Z85 SLE 3.5L Misfire VIN: 1GTDS13625
done a cylinder leak down and found that #2 valves were not sealing properly. Customer has decided to wholesale the vehicle instead of fixing it. Tried to explain to them that the truck should still be under factory warranty but they want rid of the truck. Tha... Trouble codes: P0300 (random cylinder misfire).
2002 Pontiac Grand Am SE1 2.2L anti-theft VIN: 1G2NF52F52
Thank you to everyone who replied. I had forgot to mention that the lock cylinder was replaced about five months ago, but not the ignition switch, so I went ahead and replaced that. Pretty sure that will take care of the problem. I will replace both from this ...
2006 Saturn Ion-2 2.2L No Start VIN: 1G8AJ55F56
found the codes in the bcm, replaced ifnition switch and problem is no longer there, thank you for the help
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next