× 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 April 27, 2010
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
2004 Cadillac CTS 3.6L Cuts out, MIL Lamp on VIN: 1G6DM57724
hello all, my buddy brought his caddy in in 2008 for a routine repair for check engine light and his car in failsafe mode. we pulled the throttle body codes p0121, tps #1 performance. p0221 tps #2 performance, and a p2176, idle speed not leared. we then repla... Trouble codes: P0221, P2176
1980 Chevrolet C70 C7D042 6.0L Brake Hose VIN: C17DBAV134
This truck has a single outlet master cylinder on the firewall. There is a short brake hose about 8 in. long with a short section of 5/16 line above and below it between the master cylinder and bulkhead fitting in the frame. From there steel line travels to th...
1997 Chevrolet Tahoe LS 5.7L ride quality VIN: 1GNEK13ROW
This truck picks up a noticeable vibration at about 60 MPH and continues as speed increases. It is felt throughout the truck ,more so than the steering wheel. Checked wheel balance, driveshafts for obvious damage or weights missing etc. Was going to try to rot...
2001 Chevrolet Venture LS 3.4L MIL Lamp on VIN: 1GNDX03E21
just got this van back together, customer took 2 weeks to decide to fix it.It runs great but has a po341 code. it does not have a connector for the cam sensor in the harness anywhere.runs fine & have others look for the plug from the harness,its not there. did... Trouble codes: P0341
2001 Chevrolet Monte Carlo LS 3.4L Idle VIN: 2G1WW12EX1
Car came in with a "No start" condition. Found that if you push the throttle even an 8th of an inch or so, the car starts every time. If you do not touch the throttle, the car will attempt to start but won't run. Checked throttle plate for "gunk" and cleaned. ...
2003 Chevrolet Silverado 2500 HD 6.6L Excessive Emissions, No Start, Hesitation, Stall, Misfire VIN: 1GHK29113E
This truck came in customer wanted injectors replace due to low power. As a note this one has been to every garage in town multiple times for different but similar problems. I installed 8 injectors, truck starts and runs, lots of white smoke misses alot off id... Trouble codes: P1226, P1229
2003 Chevrolet Impala 3.8L No Start VIN: 2G1WH52K53
Vehicle will not crank. I have a crank command coming from the ignition switch going into the PCM at the purple wire, PIN 23, yet there isnt any Crank Relay Control ground command coming out of the PCM at the yellow/black wire PIN 76. I replaced the PCM with a...
2004 Chevrolet Astro 4.3L MIL Lamp on VIN: 1GNEL19XX4
This customer brought car in for nys inspection and check engine light,pulled code p0155 bank 2 sensor 1 ,0/2 heater circut,verified bad 0/2 heater circut failed and replaced,car came back in approx.100 miles replaced 0/2 again thinking possible defect.car cam... Trouble codes: P0155 (Bank 2 sensor 1 0/2 heater circut)
2006 Chevrolet Trailblazer LS 4.2L Abs VIN: 1GNDT13S46
Hello, this vehicle came in for the amber ABS warning light, and red brake warning light on constatnly, I scanned the vehicle and found code U1040- loss of EBCM/ETCM communication stored under engine/powertrain codes, but had no communication when I tried to s...
1993 Geo Storm 1.6L Poor Idle Quality, Hesitation, Surge, Stall, Poor Fuel Economy, MIL Lamp on VIN: J81RF2366P
I give! All systems test within specs, newer tune up (by customer), but this thing surges, idles high and it started all at once, coinciding with the light coming on and the undocumented code. I erased it, but it comes back immediately. As I stated the systems... Trouble codes: 00288 (Undocumented)
1998 GMC Sonoma SL 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GTCS1445W
Hello fellow IATN members. 2 brand new coils, no spark to cylinder 1 and 4 from corresponding coil. cylinder 2 and 3 are fine. Tryed different PCM from junk yard with no luck. Is there something that I am overlooking. I am assuming that the crank shaft positio... Trouble codes: P0300 (random multiple misfire)
2002 GMC Sonoma SL 4.3L Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GTDT19W72
customer came in with misfire, checked and found fuel pressure to be at 55 lbs changed fuel filter and same pressure, changed fuel pump and pressure went up to 60lbs,koeo. with engine running pressure was at 56-57 lbs, still had misfire. checked cap and rotor ... Trouble codes: 300 (random misfire)
1992 Pontiac Grand Prix LE 3.1L No Start, Cuts out VIN: 1G2WJ14T6N
this 91 grand prix cuts out when cruising . hard to start after that . spark and injector pulse are present fuel pressurte ok replaced ECM , ignition module and CKP sensor still having problem
1996 Pontiac Grand Am SE 2.4L No Start, Misfire, MIL Lamp on VIN: 1G2NE52TXT
I have a 96 Pontiac Grand Am that came in on a hook. customer says stalled out and would not start back up heard loud clunk. I Checked Timing chain ans tensioners ok. Disconnected module and started car would cranks just fine without the clunk. As soon as I ho... Trouble codes: P0300 (Random Multiple Misfire Found)
2000 Pontiac Grand Prix GT 3.8L engine/trans VIN: 1G2WP52K81
Dear iatn, My future son in law is interested in purchasing a used 2000 Pontiac Grand Prix 3800 series four speed automatic with 107,000 miles. Assuming that the previous owner(s) changed the oil and filter for the engine, and the trans. has had a complete fl...
2008 Pontiac Vibe 1.8L Cuts out VIN: 5Y2SL65848
Hey guys I have a good one. 08 Pontiac Vibe 1.8 Cutomer complains that it cuts out on her. I took for a drive and sure enough it cut out on me pretty quick. It started up and i drove a few more miles and this time it cut out on me 3 times in a row without driv...

Fixes & Summaries for GM
Fix/Summary Answers
1986 Buick LeSabre Limited 3.8L No Start, no spark VIN: 1G4HR6938G
thanks for all the suggestions but this car still is not fixed ive tried a/c delco cam sensor and ignition modules also have replace crank sensor 3 times tried a ecm and have check all grounds and powers to and from module still no luck thanks agian when i fix...
1991 Chevrolet Lumina 3.1L Poor Idle Quality, Hesitation, Surge, Stall VIN: 2G1WI54T5M
Hello and thanks to all who offered help. Too many bases to cover and not enough physical resources or GM experience for this Ford tech, found no codes, fuel pressure was good, all pipoint tests were ok and customer did not want to spend $$$ without being sure...
1991 Chevrolet C1500 Silverado 5.7L Poor Idle Quality, Surge, Stall VIN: 2GCEK19K1M
Thanks to everyone who replied. I just got back from the first test drive, she's all fixed and running great. A lot of you suggested checking the fuel pressure and regulator. I pulled the regulator - diaphragm and spring were OK. I tried blocking the EGR, ...
2000 Chevrolet C2500 5.7L cooling VIN: 2GCEC19T2Y
thanks to all of you that replyed i did a combustion leak test in the cooling system and it failed replaced the head gaskets and did a valve job no more problem
2001 Chevrolet Malibu LS 3.1L No Start VIN: 1G1NE52J11
Thank you to everyone for taking time to responed to my help request.The problem ended up being the isc motor.Check power to it through flow chart and power and ground okay.Pulled isc out and tried starting motor didnt move .Hooked up scan tool to change posit...
1997 GMC K1500 Sierra SL 5.7L booster VIN: 1GTEK14R8V
Hey guys thank you for all the help, this truck never changed. the customer insited that it was never like that before but after keeping the truck for amonth and driving others just like it we told him this is normal operation and he must have gotten used to t...
1999 Pontiac Firebird 3.8L cylinder 6 VIN: 1GCEH15GT4
Feel like an idiot for "Trusting" The repair of other shop. Found Cracked porcelin on plug. replaced car runs great, thanks for all your help. Once again helped me out.
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next