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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for April 1, 2008
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Open Help Requests for GM
Help Request Answers
1996 Chevrolet Tahoe LS 5.7L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNEK13R6T
Customer complaint of running rough.The ck engine light was on before the intake repair and after.I only scanned after repair,with a po300 since they were looking for a leak,coolant.Looking up misfire data #5 was misfiring,pulled plug black sutty deposits,comp... Trouble codes: P0161, P0300
1997 Chevrolet Blazer 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNDT13W4V
at idle cyls 4&5 high misfire counts other cyls low counts,-11 cam retard (timing-distributor not adjustable)has the correct fuel pressure i also pulsed the injectors with my snap on solus(has a new cpi)all cylinders were the same when the idle is raised misfi... Trouble codes: 300 (misfire), 463 (high voltage feedback from fuel level sensor)
1998 Chevrolet K3500 Cheyenne 7.4L 1-2 shift VIN: 1GCHK3356W
This truck has a harsh 1-2 shift on light throttle only. All other shifts are fine and 1-2 shift is smooth with medium or heavy throttle. Also noticed a 2-1 downshift clunk once in a while. only codes are the 02 sensor codes.
1999 Chevrolet Astro 4.3L MIL Lamp on VIN: 1GNEL19W7X
We have a recurring catalyst failure on this van. 5 Cats total. 1st 3 were replaced with aftermarket cats, code comes back after about 4 or 5 monitor runnings. Van drives and runs 100%. Received suggestions of possible misfire, van has been tuned and there are... Trouble codes: P0420 (Catalyst low efficiency)
2002 Chevrolet Express 3500 5.7L brake lights VIN: 1GCHG39R52
this is the third chevy van i have seen with this problem . first two didnt have time to leave them . brake lights work normal with headlights off . when headlights turned on brake lights and bottom tail lights go off when pedal pressed . center brake light wo...
2002 Chevrolet Tahoe LS 5.3L Belt tensioner VIN: 1GNEC13Z22
This truck came in with a broken ac belt,i installed a new ac belt,put all back together ,started the engine and with the ac on and reving the engine from 1500 to [...] the ac belt tensioner chatters big time and makes this horrible noise ,(the tensioner is...
2005 Chevrolet Cavalier 2.2L Mechanical VIN: 1G1JC52F85
Hello all techs, I am actually just looking for some advanced input.I have a 2.2 ecotec with a very loud what sounds to be lifter tap or chain tensioner noise.I have seen many posts in archives for chain failures,but not so much for noise.Tomorrow I will be r...
1998 GMC Jimmy Envoy 4.3L HID headlights VIN: 1GKDT13WOW
Hello everyone, I have a customer who is interested in changing the HID headlights back to regular headlights. These are factory and I was wondering if anyone has done this.The cost of the lights are very exspensive and the customer does not feel like spending...
1999 GMC C1500 Suburban 5.7L No Start VIN: 3GKEC16R4X
Hey guys , i have this suburban kicking my butt!!! I've read the past repairs but not sure where to go from here. Customer came in a while ago and said at times truck hard to start but when it's start it runs great. Took to another shop and they put a fuel pum...
1992 Oldsmobile 98 Regency Elite 3.8L abs VIN: 1G3CW53LXN
Hello fellow techs, Have a problem child here. 1992 olds 98 with abs light on. Scan showed lf speed sensor open. Found worn front bearing, replaced it and rechecked system now have lf speed sensor and lf inlet valve problem. Tried a new gm abs module and now h...
2004 Oldsmobile Alero GL 2.2L Unknown VIN: 1G3NL52FX4
me again this 2004 alero has a bad vibration when put in gear worse in reverse shakes the whole car not being familiar with make and seeing engine flop around we replaced 2 motor mounts still there i know this is probably common because i have ridden in severa...
2002 Pontiac Grand Am SE1 2.2L SES, ABS, Security, & Low Trac Light VIN: 1G2NF52F42
To The Car Repair Brothers in Cyberspace, This little ole Grand Am has a ghost in it. The Security, ABS, SES, & Low Trac lights come on inadvertantly, the chime dings & the lights do not go back off until you turn the car off & back on again. There are no code...
2002 Pontiac Grand Prix GTP 3.8L egr low efficincy VIN: 1G2WR52132
OK i have a 2002 grand prix s/c. i have been working on this vehicle for a couple of weeks. I have replaced the egr valve and the cleaned the passages. the map sensor is changing with the rpm changes. the exhaust is factory with no damage. we have reset the ec... Trouble codes: P0401

Fixes & Summaries for GM
Fix/Summary Answers
1972 Buick RIVERIA 455CID oil pressure VIN: 4Y87W2H911
Thanks to all responders! Everbody prety echoed each other, with a few variations. I didn't realize we had so many oldtimers left out there. I took the advise of overfilling the crankcase and using vasoline to pack gears. Voila! 70 lbs. I have had some stubbor...
1996 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD52Y7T
1992 Chevrolet Lumina APV 3.1L Torque Converter Clutch VIN: 1GNDU06D9N
Well I Just Want To Say Thanks To All Who Helped With This Vehicle.I Replaced The TCC Solenoid Last Friday & Ran Thru Emissions For Customer,The Stalling Out Problem Is Gone.It Was A Very Simple Repair.The Van Failed Emissions Put A Converter On Yesterday (I K...
1992 Chevrolet Corvette 5.7L No Start VIN: 1G1YY23P7N
Thanks for all the help. We found an aftermarket performance chip in the PCM, removed chip, all is well. Thanks again.
1997 Chevrolet C1500 Cheyenne 5.7L Poor Idle Quality, Hesitation, MIL Lamp on VIN: 1GCEC19R9V
Based on the suggestions of many, we replaced the distributo assembly, and re-synced the cam, as suggested. This help tremendously, and the cam retard was -2 to +2 at all RMP ranges. We still had an issue, with quick hard acceleration, the engine stumbling bad... Trouble codes: P1345 (crank/cam correlation).
1998 Chevrolet C1500 Cheyenne 5.7L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 2GCEC19R8W
I thought I would be writing about a fix but the customer never came back or called. I really appreciate all the help and info you guys have given me. It probably was the fuel pump but I never got it back in to recheck with my low amp probe. This is what happe... Trouble codes: P0131 (O2S Circuit Low Voltage Bank 1 Sensor 1), P0151 (O2S Circuit Bank 2 Sensor 1 Low Voltage).
2000 Chevrolet Camaro 3.8L Radio, power top, power windows
Call this one a fix! Thanks to Steve [...]. I replaced the BCM and the problem is fixed. It has been 6 days and my customer said all is well. I could not find a bad solder joint. I think one of the internal relays was bad. iATN and Steve [...] rock! Thanks, Davi...
2002 Chevrolet Monte Carlo LS 3.4L No Start VIN: 2G1WW12E12
The fix ended up being the BCM. This thing was seeping a little rain water down the driverside of the windshield post. I'm thinking that it must have made it's way into the BCM causing havoc. Towards the end of my testing it would drain the battery in a couple... Trouble codes: P1626 (Anti-theft system Fuel enable circuit).
2002 Chevrolet Cavalier LS 2.2L No Start VIN: 1G1JF52462
the problem with this one was the three wire pass lock sensor had a broken wire the black one. on the harness side of the conector,i appreciate all those who took the time to help.
2003 Chevrolet Express 1500 4.3L No Start VIN: 1GCFG15X03
Problem was in the ignition switch (electrical) dropping voltage to 7.4 volts while cranking.. to the computer, affecting all of the fuses on the #52 "J fuse" in the underhood panel. We thought is was in the fuse panel...but it was the ignition switch...Very ... Trouble codes: P0300, P1629.
2006 Chevrolet Trailblazer LT 4.2L MIL Lamp on VIN: 1GNDT13S26
Hello all, Thank you all for your help.The air solenoid Fixed the problem The Mil stay off and passed the State Inspection.Yes the Pressure sensor and Air solenoid is one piece, the MOD wiring diagram show seperate. Thanks again, Rick Trouble codes: P2431 (secondary air injection pressure sensor a crt).
1995 Geo Tracker LSi 1.6L Hesitation VIN: 2CNBJ1864S
thank you donald it was the plug gap. i never gapped them just put them in. i took everyone's advice one by one and started with the basics compression test and while i had the plugs out i checked the gap and they were at 045 they need to be at 028 i gapped th...
1998 Pontiac Bonneville SE 3.8L MIL Lamp on VIN: 1G2HX52K4W
First I want to thank everyone for the time you took respond. I also want to thank blair again for the fuel trim article. Thanks to Gerry [...] did'nt waste any time with the cooling fan issue. Lord knows I thought I was on to something. It turned out that I two v... Trouble codes: P0171.
1999 Pontiac Grand Am SE 2.4L No Start VIN: 1G2NE12T9X
Thanks to all that replied. Good information that helped us track the problem down. Dennis and alex hit on the problem - the ignition switch. We found that the ignition switch had good voltage output in the run position but not in the crank position. After in... Trouble codes: U1000, P1630, P1631, P1632.
2005 Pontiac Sunfire 2.2L Misfire, MIL Lamp on VIN: 3G2JB52F35
Well guys this vehicle is fixed. We disconnected the board and checked the pins which looked very good and checked the signals of the cam and crank sensor at the computer. There must of been a lose connection when everything went back together have gone 50 mil... Trouble codes: P0300 (random miss).
2001 Saturn L300 3.0L motor mount? VIN: 1G8JW52R01
The car stopped acting up. Customer states that when ever it would be clunking the service (oil change reminder) light would come on. She called the other day about something un-related and said the light isn't on and it doesn't clunk anymore!? Thanks for the...
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