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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for June 23, 2009
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1997 Cadillac DeVille Concours 4.6L compressor VIN: 1G6KF5296V
HELP!!! this 97 cadillac has no 12v ign to a/c relay. fans can be controlled thru scanner. If I add 12v to a/c relay "low refrig light" goes out and comp does work. Pressure goes way up and NO RAD FAN operation. WTF??? There is code p1654?? I might have B1654?...
1997 Cadillac DeVille 4.6L Ventilation VIN: 1GKD54Y2VU
Customer complaint is simple...driving down the road with A/C on the air flow goes from face to defrost very quickly. He stops and cycles the key and sometimes this works and sometimes it does not. There are NO CODES and the self test passes. I drove it and t...
1974 Chevrolet Caprice Classic 5.7L Lighting VIN: 1N39R40130
Hi All,This car is in the middle of a restoration and needed turn signal and marker lights wiring hooked up.Got the folks at alldata to email me a wiring diagram got it all hooked up and now when you have headlights on give a turn signal you can see a slight b...
1990 Chevrolet Corvette 5.7L blower volume VIN: 1G1YY3388L
car has low volume of air coming out of air vents, came in with blower motor inop, replaced blower . customer has had low flow complaint issue for a while and nobody has been able to figure problem out . saw one fix about reprograming system on iatn but cannot...
1999 Chevrolet S10 LS 4.3L radio VIN: 1GCCS19X6X
radio is in loc mode can any one help with a code to unlock this ser#[...] pro id#fm20ev [...]
2000 Chevrolet Prizm 1.8L Hesitation, Cuts out, Stall VIN: 1Y1SK5487Y
This is a very intermittent problem, I do not believe the code is showing me the real problem, ghost code. The customer goes to start the vehicle and every so often they will have extended cranking and no fire until he steps on the gas pedal. When he backs out... Trouble codes: P0300
2001 Chevrolet Impala 3.4L No Power VIN: 2G1WF55K01
Hi Folks, I have a retired police cruiser in my shop with no power, no codes, no misfires, perfect idle, and no exhaust restriction. The customer said it ran fine until last week when it would not go up the hill to their house. I've driven with my Solus and co...
2003 Chevrolet Silverado 3500 LT 6.0L No Start VIN: 1GBJC34U63
this vehicle was towed in after customer said he had instrument cluster replaced at dealer. he said it was driven home, parked then would not restart. i initially thought it was a theft prob but its weird, the truck will crank for about 3 sec then cut out, you... Trouble codes: U1041 (ebcm loss of comm)
2004 Chevrolet Trailblazer EXT North Face 5.3L air conditioning VIN: 1GNET16PX4
The air conditioning in this vehicle stopped cooling, meaning the air got warm and humid, while traveling and requires the ignition to be cycled before it will work normal again. This has happened on more than once. I do have u1301 in history nothing current.
2006 Chevrolet Trailblazer LT 5.3L Starting VIN: 1GNET13M46
ran a relearn for theft deterrant still no start no crank checked power train relay relay okay but their is no power at fuses 28 ecm1 27 back up 22 ingition e 20fan 18air bag 16 tbc ingition 1 17 crank btsi on both sides of fuses scan tool indicates no responc...
1999 GMC Savana 1500 5.7L 3-2 shift VIN: 1GDFG15R0X
well this van came in for suspected warranty trans problem for it is a re-man trans which was installed about a year ago,it was originally stack shifting with no codes & was being commanded to do so,checked wiring,& all inputs which was good so we replaced ECM...
2005 GMC BOX W 4500 5.2L No Start VIN: J8DC4B1626
Came in gas tank full of water. Drained the water out, replaced the water seperater, fuel filter. Reprimed the fuel system. Got it started. Ran truck for 1 1/2 shut it down hot. Restart hot ok. Sat overnight, now I have a no start. Will start with either cold....
1996 Oldsmobile Aurora 4.0L No Start VIN: 1G3GR62C4T
No start--lack of fuel delivery. Car has sufficient supply--50psi and inj noid light flashes bright. I chkd inj signal on labscope--shows pcm is commanding about 10ms ontime while running. All sensors read good--MAF,CTS,MAT,TPS. Car will run Grt on external fu... Trouble codes: 1599 (engine stall)
2003 Other GM work hoarse 7.4L module VIN: 5B4MP67G73
vehicle comes in with abs light on, no codes pressent, scanner is going nuts with vehicle not running says all wheel speed sensors are going -97 mph flucuating down to -30 mph. it will not let you pull codes, but says there is codes, says the abs light is off ...
2001 Pontiac Bonneville SE 3.8L Surge VIN: 1G2HX54K71
This vehicle came to us from another shop with a new fuel pump,filter, plugs, wires, tps, mass airflow sensor. between 60mph to 70mph on acceleration there is a consistent surge as you accelerate. hard acceleration it goes away. We unplugged th egr valve no ch...
2002 Pontiac Grand Prix GT 3.8L low coolant light VIN: 1G2WP52K62
low coolant light staying on. coolant is not low. did simple test that says disconnect harness from sensor, if light goes out replace sensor. did that light back on next day. tsb says possible coolant contamination, flushed coolant, cleaned sensor, light back ...
2000 Saturn LS1 2.2L , VIN: 1G8JU52F5Y
this car came into the shop with a high pitch winding noise, i took telescope an checked it over the noise appears the be coming from the area of the water pump so i thought, the noise sound as if it coming from the area of val cover, removed the val cover not...
2007 Saturn Vue 2.2L No throttle response VIN: 5GZCZ23D27
This vehicle came to me from out of province.Customer saying when decelerating to a stop the vehicle has no throttle response.But when applying the clutch pedal and release it seems to reboot itself and is ok.No codes found & couldn't duplicate the problem.

Fixes & Summaries for GM
Fix/Summary Answers
1996 Buick Roadmaster Collector's Edition 5.7L MIL Lamp on VIN: 1G4BT52P2T
Sorry of the length of time before closing. Thank you for all the useful information, I did find that the egr valve the customer supplied was indeed the incorrect one, we installed a new OE valve from gm and car has not returned. Thank you for all your input a... Trouble codes: P0400 (egr system malfunction).
1996 Cadillac Seville STS 4.6L A/C system VIN: 1G6KY5291T
hey iAtn, sorry for ther late reply. i was left at the point where i wanted to replace the high/low pressure sensor. the GM delership location near my shop closed down, and all other dealerships dont seem to stock the part. the customer wanted to hunt one down...
2005 Cadillac Escalade 6.0L ride control VIN: 1GYEC63T05
sorry for not closing sooner... reflash pcm most of the 4 replys.. it was a pcm reflash needed... and all is well...thanks to all that replyed to me...
1992 Chevrolet S10 4.3L Surge, Misfire VIN: 1GCCT19Z2N
Thanks all closing right away so as not to clutter up this place, I tracked down a loaner finally, and it turns out that the pcm will only flash my codes anyway! owner decided to not pay to troubleshoot the comm. problem and to just have me do a rotor to plu...
1994 Chevrolet Blazer 5.7L power loss VIN: 1GNEK18K2R
1994 Chevrolet Lumina APV 3.1L No Start, VIN: 1GNDU06DOR
Many member suggested replacing plugs and wires. We did replace these items plus the dist.cap and rotor. Vehicle still ran for 20 min. and died. It started fine the next morning. We then replaced the ignition module as some other members suggested. After that ...
1995 Chevrolet Monte Carlo Z34 3.4L alternator VIN: 2G1WX12X3S
Thanks for all the suggestions. I loosened the left cradle bolts, removed the nut from the right ball joint and separated the joint from the control arm, removed the right cradle bolts and lowered the right side of the cradle.I did not have to remove the axle....
1997 Chevrolet Tahoe LS 5.7L distributor gear VIN: 1GNEK13R5V
Thanks to all who replied! The response was terrific and helpful. The consensus was; check the distributor drive gear on the cam, if it wasn't worn,replace the gear on the dist., reset the cam position signal and deliver the car. So,the cam gear looked OK. I g...
1997 Chevrolet Camaro 3.8L not sure VIN: 2G1FP22K5V
The replys overwhelmingly said that the compressors are common to leak at case half or front seal. It was also noted in several replys that it is sometimes near impossible to detect a shaft leak. Based on this information & also that the system was so thorough...
1997 Chevrolet Camaro Z28 5.7L MIL Lamp on VIN: 2GIFP32PXV
Thanks to all who replied. The car was from a used car dealership and the wanted the cheapest way out. I guessing the car was owned by a young kid because it had very little tires left on it. It seems from them beating on it the throtle body shaft was bent or ... Trouble codes: P0123.
1998 Chevrolet C1500 Cheyenne 5.0L Starting
thanks to everyone who sent help.Problem was solved today,was main ground and one small ground wire on the left rear cyl head was corroded off,why truck started when spark tester was attached i will probably never know,thanks again for all the help.
1999 Chevrolet C1500 Suburban 6.5L No Start VIN: 3GNFC16F9X
relocated and installed a new injector driver module. It's been gone almost a week now so I'm calling it fixed.
2000 Chevrolet Silverado 1500 5.3L Stall VIN: 1GCEK14T6Y
Dear helpful technicians; First I want to thank all of you who took time to try to help me. Sorry I'm so long posting this fix. The owner is a farmer and needed his truck to make hay, so I brought the idle speed up to around 650 RPM with the Tech 2 and then un...
2007 Chevrolet Silverado 3500 Classic LS 6.0L Brakes VIN: 1GBJK34U97
Thanks for all the help guys! I check all the calipers to make sure they were installed right and found no issues. The rear brake pads were getting very low so I replaced the rear brakes, flushed the system the correct way and the pedal was great. In my mind i...
2001 GMC Sierra 2500 HD SL 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GTHC24UX1
First I want to say thanks to all that replied. I was not able to fix this vehicle but did find out that the mil was flashing for the last 100,000 miles or so. I swaped injectors, coil, plugs, wires, unhooked exhaust and blocked then replaced the egr valve all... Trouble codes: P0300 (ramdom missfire).
2001 Saturn L300 3.0L No Start VIN: 1G8JW54R31
Thanks for all of the help. We were able to relearn the key and the vehicle started with the ECM that came with the used engine. The air bag light came on due to a VIN missmatch. We had the VIN programed into the ECM, thanks to Mike from Sons Auto Parts.
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