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Prev Professional Automotive Repair Technical Discussions for November 4, 2005
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Open Help Requests for GM
Help Request Answers
1999 Cadillac Seville SLS 4.6L compressor
I need some help from the Cadillac crowd. This car was brought in to change altenator. In the process we removed the a/c compressor. Upon completion we charged the system and proceded to test all systems and could not get the ac system to engage(customer claim...
1992 Chevrolet C1500 Cheyenne 5.7L radio VIN: 1GCEC14K9N
The radio on this truck works fine as long as the headlights or parking lights are not on, but as soon as you turn either of them on the radio shuts off. If you turn the instrument dimmer switch all the way down the radio will come back on or if you shut the h...
1992 Chevrolet Astro 4.3L ping VIN: 1GCCM15ZXN
truck will ping on acceleration,tested fuel pump amp wave 4 amp but flat pattern,checked fuel pressure,11psi at idle and under load,pressure drops to 0 after 4 seconds of shutdown? have tested egr system and replaced faulty egr valve,replaced dist cap and roto...
1995 Chevrolet C3500 5.7L brakes VIN: 1GBHC34KXS
Truck pulls right on braking only. Soft, medium or hard. If I hold on to the steering wheel(keep it straight), the right front will dip slightly. Initially the pads were thinner on the right side by 3-4/32ths. Replaced calipers and hoses on both sides, pads, t...
1997 Chevrolet Monte Carlo Z34 3.4L Cuts out, Misfire, VIN: 2G1WX12X1V
The customer brought this to us after having it to other shops and some self diagnostics/repairs. This vehicle feels like the rev limiting function of the PCM is coming in too early. 3300 RPM (spec 5200). My tech states the following: The MAF was disconnected ... Trouble codes: P0306 (Misfire 6)
1998 Chevrolet C1500 Cheyenne 5.7L hard start VIN: 2GCEC19R8W
hello group TRUCK came in on hook,,,it will start and run,but after it gets to normal operating temp, u turn it off and it hard to start,it sounds like its dontonating on start up.fuel pressure is in spec,checked tdc with piston up ,rotor at number one cly. i...
2005 Chevrolet Silverado 2500 HD 6.0L tires VIN: 1GCHK29U35
To chevy truck guys,thanx in advance.I recently purchased a 05 silverado 2500 HD.I want to up grade the original 245/75 16 tires.Can i go bigger without lift or reprograming.reprograming although is not out 100%.Any info is greatly appreciated.
2000 GMC Sierra 1500 SL 4.8L hard start VIN: 2GTEC19V3Y
the vechicle starts fine cold but does have a hard time starting with a hot engine the driver has to press down on gas pedel to start it. I replaced the idle air control valve. coolet temp reads ok. I am thinking it need mass air flow
2002 GMC Envoy SLE 4.2L Mechanical VIN: 1GKDT13S42
This GMC Envoy when the engine is cold makes a knocking sound as it gets warm the knocking goes away,I have 2 Envoy with the same problem.Thanks in advance, Thomas.
1998 Pontiac Firebird 3.8L heater VIN: 2G2FS22K1W
customer came in and stated that heater was not getting hot, she had the water pump replaced and thermostat and still same problem. we checked heater control & door ,it ws ok. flushed heater core & bled system,still Low heat.Tested Rad.cap It was ok.we take he...
2000 Pontiac Grand Am GT 3.4L MIL Lamp on VIN: 1G2NW12E1Y
Good day eh! Hello fello techs.I have just replaced the intake gasket on this Pontiac,nothing out of the ordinary.Now the mil light is on showing codes P0403,P0405 EGR.At the EGR connector there is a ground at the black wire but no power at the red or brown wi... Trouble codes: P0403 (EGR Control circuit), P0405
2001 Pontiac Aztek 3.4L Anti-Theft VIN: 3G7DA03E21
replaced bcm to fix power door locks and intermittent battery draw. when replacing pcm, we programmed vin, setup bcm, set point of sale, set option configuration, and relearned theft system. problem is gone. however, now everytime customer unlocks the drivers ...
2001 Saturn L200 2.2L passlock VIN: 1G8JU52F31
Car came in with a 'no start' condition. vehicle cranks fine and has spark and fuel. The security light in the das was flashing, we followed the tsb on the passlock sensor and found it to be faulty. Put new sensor in and did the thirty minute relearn process p...

Fixes & Summaries for GM
Fix/Summary Answers
2002 Buick Century Custom 3.1L wipers VIN: 2G4WS52J12
Thank you for everyones help. It was the control arm park tab it was bent we fixed that and it worked great.
1994 Cadillac DeVille 4.9L battery VIN: 1G6KD52B6R
customer decided to trade rather than spend more money for repairs .i am grateful for his decision and the replies that i recieved.thanks to all
1978 Chevrolet C30 Cheyenne 7.4L brakes VIN: CCS348Z214
We received many replies on this one. The replies ranged from a bad booster, PS pump, to glazed brake shoes and pads. The pads were glazed but the pedal was hard sitting still also so I do not believe this was the problem. After going through all of your repli...
1989 Chevrolet Corsica 2.8L No Start, Poor Idle Quality VIN: 1G1LT54W8K
Sorry guys but I have to do this first just because hope you understand. Dennis first off I checked Mitchell and Alldata prior to replacing the fuel pump they both said the pump should have between 40 - 45 psi things may have changed but when I went to school ...
1997 Chevrolet Express 1500 LS 4.3L MIL Lamp on VIN: 1GNFG15W4V
Hi and thanks for all of the input. I checked the timing chain play was about 5 degrees of looseness. I removed the distributor and found that the gear was worn down, causing the cam retard timing to be off. When the distribtor was spun by hand it had a tight ... Trouble codes: P0300 (Random cylinder missfire).
2000 Chevrolet Impala 3.4L 1-2 shift VIN: 2G1WF55E7Y
Thanks to Jerry and Jon for your time. The EPC was replaced on initial overhaul. Jon's reply made alot of sense, but we decided to send it out the door because of how slight the shutter was. Thanks again.
2002 Chevrolet Trailblazer LS 4.2L Hesitation, No power VIN: 1GNDS13S42
The TPS fixed the problem. It runs great now and has tons of power once again. These things are quick for a SUV. Thanks again everyone for the help. Jerry.
2000 GMC Savana 3500 5.7L 3 rd gear VIN: 1GDHG31R3Y
The customer declined any further repairs. From the replies and from out testing it appears the problem is in the transmission. The customer is a housing contractor and has just got a big contract restoring apartments in the hurricane area. I hope and assume h...
1993 Pontiac Trans Sport 3.8L Surge, starts in 2nd gear VIN: 1GMDUO6L8P
thanks for the replies, it helped. vehicle ended up going back to transmission shop. they were going to replace the transmission first and we have not heard back if the customer fixed it or not. thanks again. Trouble codes: 99 (power management problem), 38 (tcc brake switch), 65 (cruise control servo position sensor), 67 (faulty cruise switch), 68 (cruise command problem), 88 (pcm reset).
1998 Pontiac Grand Prix SE 3.8L Engine VIN: 1G2WS52M4W
Thank you all who read and replied to this post. Once again THIS ENGINE IS A 3.1L NOT I REPEAT NOT A 3.8 the cust has decided to get rid of it. I was just wondering if it was a common problem. Now I see that it is.
2004 Pontiac GTO 5.7L body VIN: 6G2VX12G64
Suggestions were made to check for anything that hanges on the engine that could be close to frame, body, cowl, that could touch and be noisey. We could find nothing. The transmission housing where it bells out for the torque converter was the closest area but...
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