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Prev Professional Automotive Repair Technical Discussions for May 20, 2005
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Open Help Requests for GM
Help Request Answers
1997 Buick LeSabre Custom 3.8L Passenegr Side Control VIN: 1GHR52K9VH
Greetings Fellow Techs, Got one I need to run by the AC experts out there. 1997 Buick LeSabre with dual control AC system. Both AC and heat work fine with just the driver controls but the passenger controls do not change the settings on the passenger side. Bot...
1999 Cadillac Seville STS 4.6L Modules VIN: 1G6KY5491X
Hello all, I have a crazy one here. This happens to be one of our best customers and he has been very patient, thankfully! When problem occures, windows, radio, doorlocks, and trunk release all become inoperative and the SIR, TRACTION CONTROL, and SECURITY LGH...
1990 Chevrolet K1500 Cheyenne 5.0L clutch VIN: 2GTEK192KL
truck came in with a knocking noise in the t rans. remove and disassemble trans (getrag). found broken input teeth and cluster gear teeth. condemned trans and replaced with a good used one. filled trans with syncromesh fluid. after all back together does not ...
1998 Chevrolet Camaro 3.8L No Start, MIL Lamp on VIN: 2G1FP22K2W
Vehicle came in with a no start at times. It was discovered that when there was no start it didn't have any spark and that when I cleared the trouble codes it would start. Dealer said a lot of problems with the vent sol. on this model so the vent sol. was repl...
2000 Chevrolet Silverado 1500 5.3L Gauges, Batt light. VIN: 1GCEK14T8Y
Hi techs, got a wierd one here. Customer complaining of gauges dropping to zero momentarilly. Battery light will also come on as will abs and brake light. Service 4wd light also comes on but only from start up.I was suspicious of a ground problem, but the grou...
2000 Chevrolet Suburban 1500 LT 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 3GNFK16T4Y
Treat this as possible duplicate, my ISP (Comcast)dropped me when sending this help request. This truck came in with intermitten rough running complaint and customer need to leave town that night. First road test yeilded NPF, but after hot soak and restart it... Trouble codes: P0300
2002 Chevrolet Silverado 1500 5.3L Unknown VIN: 2GCEK19T02
Customer has an intermittent clicking noise in truck when leaving a stop or in reverse. We have driven the truck several times in an attempt to duplicate. We have only heard a small amount of clicking,sounds like marbles in a can. Customer states it is so loud...
2002 Chevrolet Suburban 1500 LS 5.3L A/C Drive Belt VIN: 3GNFK16ZX2
(Suburban has front and rear A/C) Problem is A/C Compressor drive belt noise, when running anything above idle, Belt & tensioner begin to bounce, making a squeal & knocking noise, I believe that the compressor is most likly pulling way too hard, but 235psi hig...
2003 Chevrolet Cavalier LS 2.2L cooling fan&ETS control VIN: 1G1JF52F73
The car is clean and fairly well kept, The customer complaint is the cooling fan runs almost all the time. When the fan is running the trac off light in the cluster is on. If the trac light goes off the fan shuts off. The scan data shows normal data 180 to 195...
1997 GMC C1500 Sierra GT 5.7L Misfire VIN: 1GTEC14R3V
The customer stated that after the intake gaskets were replaced the engine developed a miss. It's most noticable at initial accel with a slight rough idle. Nothing shows on the scope & compression tested ok. Pulled EGR valve & it appears ok, though some slight...
2000 GMC K3500 Sierra SLE 7.4L Excessive Emissions, Poor Fuel Economy, MIL Lamp on VIN: 1GTHK39JOY
lt fuel trim b2 -18 at cruise, -9 at idle. b1 also neg. readings. have been on tech hot line and only one reading seems suspect. maf is 2700hz at idle (gm spect is2000, vantage spec is 2300. at 2500 rpm, 4700hz, spec is 4200hz. have tried reman maf and reads s... Trouble codes: P0175
1995 Oldsmobile Cutlass Ciera 3.1L Cuts out VIN: 1J3AJ85MXS
customer complaint is interminttent cutting out while driving [of course, we can't get it to do it] i would like very much to help her, but don't want to just stuff 20s under the hood. she says that it just stops, she coasts to the side of the road, starts it ...
1999 Pontiac Grand Prix SE 3.8L fuse/relay center VIN: 1G2WR215FX
this came in as crank/no start. spark present, no fuel. found no power to prime pump key KOEO or power to pump KOEC. assistant was still cranking while i plugged relay back in and it started and ran. wiggled relay, could feel it opening/closing. did the same t...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick LeSabre Custom 3.8L Cuts out, Stall VIN: 1G4HP53L5P
After taking some time to think this through, I came to the conclusion that, (with the help of several responses) no matter what other problems the car might have, incorrect fuel pump current draw measured only inches from the fuel pump, must be caused by a pr...
2004 Cadillac Escalade 6.0L compressor VIN: 1GYEK63NX4
Replacing the A/C Control Module fixed the problem (Its all in the head with the knobs & buttons). The module tell the ECM to turn on the compressor and then the ECM grounds the A/C relay, which powers up the + side of the compressor. The ground side is contro...
1995 Chevrolet K2500 5.7L transfer case VIN: 1GCFK24K6S
Thanks for all the help. IATN is the best tool I have. If you aren't a sponsoring member I suggest you fix that. Some replies mentioned t case bearings or tire size. As earlier stated both possibilities had already been eliminated. Turned out to be the pinion ...
2001 Chevrolet Express 3500 5.7L Stall VIN: 1GCHG35R51
First I want to say what an overwelming response I got THANKS TO ALL. Most told me to check fuel pressure regulator, but my fuel pressure remained the same when the truck ran or didn't. A couple of guys said to check the ECM connections which were ok. Jack and...
2002 Chevrolet Suburban 1500 LT 5.3L pasenger front seat VIN: 1GNFK16Z42
thanks for all the help guys. kent purcel had the best idea for diagnosing the problem. i took two 50lb bags of dog food, yes you heard me dog food. placed it on the front of the passenger seat and still had the noise. so it had to be in the seat track.i don't...
2002 Chevrolet Silverado 1500 5.3L Brake Drag VIN: 2GCEK19T82
Thanks to all , After inspection of both brake lines and relieving pressure found master cylinder causing just front brakes not releasing, rear worked all the time. Thanks again
1998 GMC Safari SL 4.3L No Start VIN: 1GKA19W8WB
thanks for all the replies. didn't know fuel pressure was so critical on this type injection system. replaced fuel pump and filter. engine starts fine. thanks again iATN Trouble codes: 1351 (ic circuit voltage high).
1999 GMC Savana 1500 5.7L steering shaft VIN: 1GDFG15R5X
thank you all for the help the emails were right on target the fix was gm sells a grease kit for the shaft you remove the int shaft and install the grease kit and follow instructions put it back in and i drove the van to the customers house with no noise.
1988 Oldsmobile Firenza Cruiser 2.0L Hesitation, Cuts out, Stall VIN: 1G3JC5117J
We did check compression it was good. One reply talked about a plugged cat, but the stumble was right away from wot. Donald from Missouri had a very useful hint in regard to checking if the vacuum actually dropped right away from the map sensor. I found that o...
1996 Oldsmobile 98 Regency Elite 3.8L information center VIN: 1G3CX52K4T
thanx to those who replied, my case was a simple intermitant shorted wire to the license plate light bulb, the wire would short and cause the circit resistance to drop and the lamp failure module would pick this up. however the short was so minor that the bulb...
1998 Pontiac Trans Sport Montana 3.4L speedometer VIN: 1GMDX03F1W
Thanks to all that took the time to reply to my help request, What i did is cut the wire at the computer and at the speedo and installed a jumper direct from the pcm to the speedo and it works fine, this is all the customer wanted to work. Im sure there is one...
1999 Pontiac Grand Prix GT 3.8L oil pressure VIN: 1G2WP52K5X
Hey guys, after pressurizing the main oil galley with air we found the problem. The rear cam bearing was not installed properly. They installed it from the back and needed to go in another 1/4 of an inch and wasn't covering the oil galley! We pressed it in and...
2001 Pontiac Sunfire GT 2.4L MIL Lamp on VIN: 3G2JD12T01
Well, here we are again, sorry for taking so long to close, quite busy here. Thanks to those who offered advise, from rechecking all again it seems the fuel tank pressure sensor is the most likely cause of this fault so currently we are waiting on the customer... Trouble codes: P441.
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