× 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 May 9, 2007
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
1985 Buick Riviera 5.0L Misfire VIN: 1G4E267YXF
Have this vehicle that runs great when cold. Then after few miles it will misfire under part throttle. If you go full throttle it will seem to run better. No codes, disconnected EGR valve, Oxygen Sensor. Tested vacuum pressure sensor and it respond to vacuum c...
2002 Buick LeSabre Custom 3.8L door locks, cluster, windows, lighting, etc. VIN: 1G4HP54K92
Hello All, This car came to us with an intermittent issue where the cluster, door locks, windows, interior lighting, radio, etc. would quit working. Customer says it has gotten progressively worse over the past week. All of the above weren't working when it g...
2001 Cadillac DeVille DHS 4.6L swps VIN: 1G6KE57Y61
Any help is greatly appreciated. Another cadillac is giving me a headache. The car came in for a conplaint of intermitint service stability sys message displayed on the info center. Scanned for codes and found C1287 steering sensor malf and C1288 steering sens...
1994 Chevrolet C1500 5.0L Hesitation VIN: 2GCEC119H0
This truck runs good cold and hot but in between it hesitates. Immediately after closed loop it hesitates until warm. Found several things on the net about fuel pump, distributor, bad coil, and bad grounds but none of that seems to be a problem with this vehic...
1994 Chevrolet Corvette 5.7L shifter VIN: 1G1YY22P0R
during replacement of clutch assembly we had to disassemble the "reverse lock out" on the shifter. cannot get it back together so as to get vehicle in reverse, all other gears functional. alldata and numerous phone calls to local techs have not helped. need so...
1994 Chevrolet K2500 Cheyenne 6.5L Poor Fuel Economy VIN: 1GCFK29S8R
hello diesel techs need infoe .on the fuel line on motor where line mounts to thermostat housing i broke line while changing stat.my question is what is the brass petcoke looking valve and what is its purpose and can it be eliminated.the line cracked right at ...
1995 Chevrolet S10 LS 4.3L No Start, Cuts out, Stall VIN: 1GCDT19W8S
need help bad!!! one of my accounts kids truck. 95 s-10 lifted to the sky a esay 25k in this truck paint lift kit etc... problem is truck was cutting out and running/idling like egr stuck open. no egr code. pulled egr cleaned installed new update screen gaske... Trouble codes: P1351 (icm signal high)
1998 Chevrolet Blazer 4.3L turn signal flasher relay VIN: 1GNDT13WXW
the turn signal flasher clicks at all times when the moter is running unless the brake pedal is depressed. the turn signal lights are not flashing at this time and seem to work normally with the exception of an intermitant no flash condition while the break pe...
1999 Chevrolet Camaro 3.8L Misfire, MIL Lamp on VIN: 2G1FP22K7X
THIS FOR A CO-WORKER,.. original complaint was no heat,..intake gasket was leaking,.NO driveability problems at that time. Replaced gaskets,..delivered car 3 days later check engine light on,..idles good when cold,..as engine warms up noticeable "shake" and in... Trouble codes: P0171 (fuel trim system lean bank 1), P0174 (fuel trim system lean bank 2), P0305 (cly 5 misfire)
1999 Chevrolet Silverado 1500 5.3L mode VIN: 2GCEK19T3X
Greetings fellow techs, Got a 1999 Chevrolet K1500 Pick-up in the shop today that won't switch modes on the heater/air conditioner. Most all of the air is coming out of the dash ducts. Several months ago we replaced the HVAC Module per the service bulletin we ...
1999 Chevrolet K1500 Suburban 5.7L Lifters VIN: 1GBFK16R4X
Thank you for taking your time to read this. I replaced the intake gaskets using felpro's improved metal gaskets with rubber inserts. There was a small amount of condensation in the valve covers but the oil did not look like it had been contaminated. Rig ran g...
2000 Chevrolet S10 2.2L Poor Idle Quality, Misfire VIN: 1GCCS1943Y
Truck is fouling the # 3 plug, have replace the plugs, wire and coils and the module. It has gas running out of the exhaust pipe and when the # 3 plug is removed the cylinder is saturated with raw gas. Engine will clear up at full trottle but loads back up at ... Trouble codes: P0200
2001 Chevrolet Impala LS 3.8L ABS Traction Control VIN: 2G1WH55K81
Traction control light comes on and ABS, the vehicle will not move like the trans. is disengaged, when the lights come on. I have pulled codes and replaced lt and rt wheel speed sensors and the electronic brake control moodule and pump assy, did not help. I wo...
2002 Chevrolet S10 2.2L Cooling System VIN: 1GCCS14562
Help!!! Electrolisys??? This vehicle is used in a unique situation. It is our security vehicle and it runs 8 hrs every night and 24 hrs on the weekend, always at an idle. The milage is decieving so I have installed an hour meter whitch shows 6055hrs on the eng...
2002 Chevrolet Venture LS 3.4L transfer case VIN: 1GNDV03E32
This AWD venture has a very loud bearing noise at the transfer case output to rear driveline. With it running on the hoist the noise is deafening. The local dealer or transmission shop has never seen this problem, vehicle only has 55,000 miles on it, anyone ra...
1994 Geo Prizm 1.6L Excessive Emissions, fails NOX VIN: 1Y1SK5362R
The vehicle failed NOX . I have checked ignition timing, tps idle contact, timing belt indexing, crank gear, and the harmonic balancer keyway for wear. I replaced the catalytic converter. The o2 is working, stays between .4 and .5 volts and goes up and down wi...
2002 GMC Savana 3500 6.5L power steering pump & hydraulic brake booster VIN: 1GDJG31F52
I 've got a problem with the power steering & hydraulic brake booster in this 2002 GMC G3500 Savana diesel box truck. After running all day, vehicle is parked and power steering fluid burps out of remote reservoir (less than 1 quart). When vehicle is started ...
1991 Pontiac Grand Prix GT 3.4L Stall VIN: 1G2WP14X5M
thanks in advance for any replies.this grand prix will stall intermittantly when hot when the cooling fan turns on. there is no codes present. i ran a snapshot with my mastertech and didnt seem like i was loosing anything. i labscoped the crank sensor and the ...
1997 Pontiac Grand Am SE 3.1L tail or running lights VIN: 1G2NE52M3V
keeps blowing fuses for tail lamps , i had found bad bulbs and replaced all with the new. light's were working for one day Every time you replace the fuse it blows right away. have checked for shorts and found none this car also has fog lights and they have be...
1993 Saturn SC1 1.9L No Start, Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 1G8ZH157OP
another tech has installed and flashed a pcm tofix this prior to being handed over to me.sometimes wont start,codes26 and 27 in it.when it wont start it has no spark.checked crank sensor and test ok.ireally dont think the code is related although it sets as so... Trouble codes: 26 (qdm failure)
2002 Saturn L200 2.2L Wipers VIN: 1G8JU54F32
This Saturn's wipers will operate without the switch being turned on. We've replaced the switch and the relay with no results. Having looked at the wiring diagram available for this, I can't see where voltage would be able to get to the wiper motor without the...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Chevrolet Cavalier Z24 3.1L Misfire VIN: 1G1JF34T2R
IATN rocks! Thanks to everyone who replied. The day after I opened the help request, I was driving the car when it had a particularly bad episode of sputter-itis. It set a code 15 for the coolant sensor. I also remembered that every once in a while I would sme...
1998 Chevrolet Cavalier 2.2L diagnostic VIN: 161JF52T7W
Not sure why the modis wouldnt work. still a mystery but appreciate the information. If I get any new information I will give it on to you.
1999 Chevrolet Tahoe LS 5.7L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1GNEK13R5X
Well thanks to all that replied, I'm a trans specialist trying to help a friend so I sublet to a better qualified shop for further diagnosing & repair. I did find that #5&7 were most commonly misfiring and the plugs were actually dripping with fuel and fouled ... Trouble codes: P0300 (random misfire), P0305 (misfire 5), P0307 (misfire 7).
2000 Chevrolet Express 2500 5.0L No Start VIN: 1GCFG25M7Y
most replies indicated what i had thought not enough fuel pressure at 55#to open the poppet valve to start van up.we installed a new fuel pump assembly in it last night and sure enough it fired right up.my cranking fuel pressure was up around 60#and when i shu...
2002 Chevrolet Silverado 2500 6.0L MIL Lamp on VIN: 1GCHK24UX2
Ever since I changed the PCV valve the MIL has not set. I still do not know why it had a PCV with just a hole and not a actual valve. Trouble codes: P0102.
2003 Oldsmobile Alero GX 2.2L no start at times VIN: 1G3NK52F63
turns out that the ignition switch was the main problem ignition key was an aftermarket type and was worn on one side so that also caused problems with the pass key system thanks for all the help mark
1990 Pontiac Grand Prix LE 3.1L Poor Idle Quality VIN: 1G2WJ14TXL
Thanks to all that replied. I had several posts to check the pcv valve, for one reason or the other. The valve on this motor isn't easily accessible, so it was overlooked in my first troubleshooting, thanks for waking me up, the valve was carboned up and stuck... Trouble codes: 44 (lean exhaust).
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next