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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for January 12, 2010
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
1993 Buick Park Avenue 3.8L interior VIN: 1G4CW53L3P
Occasionally vehicle has a smell of hot candle wax burning in interior at traffic stops after 15 minuets never at cold start or before 15m. Had this occur last summer too, thinking it was from leaking oil on exhaust. Eng/tr replaced Nov 2009 for failing transm...
1996 Chevrolet C60 Kodiak C6H042 6.0L Poor Idle Quality, Stall VIN: 1GBJ6H1P1T
vehicle has everything new.right side injector only fires on cranking will not fire in run mode.replaced with another injector in case new one was bad no change.found no signal coming from wire from d16 connecter replaced wire with whole new one.no change repl...
1998 Chevrolet Astro 4.3L Misfire VIN: 1GNDM19WXW
Thanks in advance. I have a simple igntion arc coming from the bottom of the coil wire to the coil. It only happens when trying to start cold. It will continue to crank until it catches which takes 1 to 4 key cycles. Once it starts, there is no problem. It is,...
2001 Chevrolet Silverado 1500 5.3L compression VIN: 3GNFK16T11
vehicle towed in for stall. restarts but runs roung. found all cylinders on right bank misfiring. compression between 50-80 psi. left bank 200-220 psi. found converter plugged. removed, cleared cylinders and retested. right bank still low compression. code(s) ...
2004 Chevrolet Trailblazer LS 4.2L Mode Actuator Motor VIN: 1GNDS13S34
This vehicle came in with the mode actuator door only switching between floor and defrost. Any setting other than these two produces no change. When the mode selector switch is set to blow on both vent and floor the engine begins to stumble and if the mode sel...
2005 Chevrolet Silverado 2500 HD 6.0L Tailights VIN: 1GCHC24U95
Brake lights are dim,CHMSL is bright when brake activated. When turn signals are operated the tailght bulbs dim way low and turn signals are dim as well. Headlight switch activation causes Tailghts to completely go Dark.Checked for melted wires, and possible s...
2008 Chevrolet Silverado 1500 LT 5.3L cruise control VIN: 3GCEK133X8
Hello I need a little insight here on the cruise control system on this truck. It is inop probably 99% of the time. Sometimes you can get it to come on by tapping the brake pedel but the switch test fine. While scanning cruise system, all functions seem to wor...
2003 GMC C5500 Topkick C5C042 6.6L Mechanical VIN: 1GDE5E11X3
Hello, I just replaced a set of head gaskets that were leaking coolant and now after the job is done I have a thumping sound from the intake. My heads were straight so there was no need to surface them, I simply pulled the heads, cleaned them carefully with a ...
2004 GMC Sierra 2500 HD 6.6L right hand battery VIN: 1GTHK23224
This truck has a single alternator system its got the dual battery set up.This is the problem the right hand battery will seem to over charge and spill acid out of the cells, the left battery will not,seems fine,swap batterys from left to right and the battery...
2001 Oldsmobile Aurora 3.5L Drivers door controls, DDM VIN: 1G3GR64H61
Hello, we have this Aurora that lost all control on the drivers door panel. Power windows, power mirrors, door locks, gas door release, trunk release. The only thing that works it the light in the door panel. If you use the remote all the door locks will cycle...
2003 Oldsmobile Alero GLS 2.2L radio VIN: 1G3NL52F13
Thanks for the help in advance. After replacing the antenna amplifer module and the pig tail customer complains about static on the radio when turning on the defrost. warrenty module no change. checked wires made sure that it didn't get switched around when re...
1996 Pontiac Grand Am SE 2.4L Theft system VIN: 1G2NE52T2T
This grand am was brought to us as a start and stall. The cluster was pretty much dead and appeared to have an anti-theft problem. Code p1629 was stored in pcm. Cluster was sent to ISS for repair. After cluster was installed it not appear to go through the VTD...
1997 Saturn SC1 1.9L No Start, MIL Lamp on VIN: 1G8ZH1271W
Hello IATN members. I have a 1997 Saturn SC1 with a 1.9L twin cam, 16 valve motor. The customer has a complain of a no start when cold. After the car warms up he don't have a problem starting it. It only happens when it is cold soaked over night. He is able to... Trouble codes: P0133 (O2 Sensor B1S1 Response Too Slow), P0326 (Knock Sensor Out Of Range), P0341 (CMP Sensor Out Of Range), P0351 (Ign. Coil A Problem), P0352 (Ign. Coil B Problem), P0463 (Fuel level Sensor)

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick Roadmaster Limited 5.7L MIL Lamp on, Shifts hard VIN: 1G4BT52P3R
Well hell fellas...finally got it fixed. Just about everyone replied with opens or shorts as suspect. I tried swapping the old ecm, still the same. I snatched the ecm back out, pulled the connectors back out, then looked through the clear plastic pin coveri... Trouble codes: 33 (MAP sensor signal voltage high), 82 (Shift solenoid A circuit).
1997 Cadillac DeVille 4.6L Mechanical VIN: 1G6KD54Y3W
Thanks for all the replies. We fixed the problem by retorquing the crank bolt to 125 ft. pounds and than we back pressured the oil system with 2 qts. of oil at 45 pound though the OPS hole at the oil filter. Started engine and had 90lbs of pressure ,and the en...
1994 Chevrolet S10 4.3L Misfire, MIL Lamp on VIN: 1GNCS13W6R
THANK U ALL. apparently customer has traded in for newer model. never able to investigate further. would have loved to delve further into with the helpful tips that were provided. i guess we may never know on this one.
1995 Chevrolet K2500 5.7L Misfire, backfire VIN: 2GCEK19K75
cutomer took the vehicle back to the backyarder who installed the engine. They replace the wiring harness from a wrecking yard and now he says its much better.
1998 Chevrolet P30 7.4L emergency brake VIN: 1GBLP37J5W
This E brake problem was repaired by another shop. I bailed. My understanding is that they installed an altogether new, updated E brake control system. I believe they said the pump was bad, and it was not available: hence the whole new system.
1999 Chevrolet S10 4.3L none VIN: 1GNDT13WXX
The reason that this unit would not set monitors turned out to be the Thermostat. This units temperature would not raise above 158 deg's F. It wouldn't set a code and it wouldn't set the monitors. Replaced the thermostat and the temp went to 197 deg's and the ...
2003 Chevrolet Silverado 1500 5.3L Differential VIN: 6981455515
i want to thank everyone for there responses. they were very helpfull and it happened to be the thrust washer that fell down into the diff as a result of pulling the axle out without engaging the 4wd first. lesson learned lol... thanks again.
1992 GMC Sonoma 4.3L Poor Idle Quality, Poor Fuel Economy VIN: 1GTDT19W3N
Thanks everyone for your help, I installed a new CPI unit and the truck runs great... Trouble codes: 45 (Rich Exhaust).
2005 GMC W3500 Forward W3S042 6.0L batt lite blower motor brake and booster lite VIN: 4KDB4B1U05
Alternator was not charging, the blower motor not working threw us but after we opened the request for a wiring diagram we checked the alternator because that can make the brake lite go on on different vehicles. Thanks for the quick response.
2001 Pontiac Grand Prix GTP 3.8L abs VIN: 1G2WR52141
As most of you said with that harness on the right front i replaced it and all is well. I did find a small crack in the old portion of the harness once i had it off the vehicle and out of the sheath. So again thank you to everyone!
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