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Prev Professional Automotive Repair Technical Discussions for May 18, 2009
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Open Help Requests for GM
Help Request Answers
1992 Buick LeSabre Limited 3.8L No Start, Stall VIN: 1G4HR53L4N
This Buick Le Sabre will run fine at idle, when shut off, it will not restart and code 17 shows up. In the book it says to disconnect icm harness from module and jumper terminals c and h. With key on, to check voltage at terminal c. If 5 volts is not shown on ... Trouble codes: 17 (rpm signal problem)
1994 Buick LeSabre Custom 3.8L Stall VIN: 1G4HP52L1R
We have this headache that likes to loose fuel pressure. We test for power and ground at the pump connection, appears good, replaced pump. Test drive 50 miles, return car to owner. Two days its back, same symptoms. Now during detail electrical testing we notic...
1998 Cadillac Seville SLS 4.6L rear strut dampning VIN: 1G6KS54Y6W
Howdy there, This caddy belongs to an elderly Marine, Well mostly elderly, he just got new knees! Trying to help this guy out, very nice and kindly fellow. Was taking his daughter to soccer practice and as he puts it the car was riding fine and then it wasnt. ...
2004 Cadillac Escalade ESV 6.0L MIL Lamp on, TIGHTEN FUEL CAP VIN: 3GYFK66N04
initally evap purge solinoid flowing at all times, replaced ok, upon running monitor readiness gross leak still detected, checked evap vent solinoid found light blue piston sideways and falling out/ definintly not able to close and seal correctly. replaced and... Trouble codes: P0455
2005 Cadillac Escalade 5.3L No Start VIN: 1GYEK63N55
Hi everybody, i have this Escalade that the customer lost the key, ordered another one from USA and got it but the problem it can turn the ignition but the engine will not start, i know maybe the key need to be learned to the ECM, as i don't have the original ...
1996 Chevrolet K1500 Cheyenne 5.7L Misfire, MIL Lamp on VIN: 2GCEK19R9T
engine will idle @ -2 cam retard, increase rpm and cam retard goes to 45 and sets code. scanner does not pick up and particular engine missfire. distributer shaft feels no play. ecm??? what other info can i give you? Trouble codes: P0300 (random missfire)
1998 Chevrolet C2500 Cheyenne 5.7L a/c leak VIN: 1GCGK29U4X
vehicle came into shop for not blowing cold air,inspected for leaks /visual only.noticed oil all over front of compressor,pulled vaccum and recharged a/c system, compressor front seal leaking.replaced compressor ,drier and orings along with orfice,flushed syst...
2002 Chevrolet Silverado 2500 6.0L headlights VIN: 1GCHK29U82
Ive got one thats driving me crazy. 02 silverado w/DRL and meyer plow system. Headlights are always on high beam, all 4 lights are lit as well as the high beam indicator. have tried -- multi-function switch, headlight switch and headlight relay. same problem a...
2007 Chevrolet Silverado 1500 WT 5.3L speedometer VIN: 2GCEK13M87
customer has replaced tires with different size & needs to have it recalibrated. I have tech 2 & tis But could not find a module with selectable choice. Any help on where to find the information would be great. Kyle
2008 Chevrolet Avalanche LS 5.3L fluid VIN: 3GNFK12338
this is my personal vehicle,after pulling my travel trailer 370 miles i started to notice a gear oil oder. i climbed underneath the truck and didn't find any leaks, checked the fluid and it was full,as i loosened the drain fluid check plug the oder was very st...
1993 GMC P3500 6.2L noise VIN: 1GDKP32JXP
To all diesel techs please help! This van came in we replace heads & gaskets. The motor now runs good cold but as it warms up it developes a noise that is coming out of the intake. It almost sounded like a lifter snaping noise. We remove the valve cover & chec...
1989 Oldsmobile Delta 88 Royale Brougham 3.8L Hesitation VIN: 1G3HY54C5K
new fuel pump has the same readings. I have what appears to be low volume, less than a half of a pint in 30 seconds and lots of air bubbles in the line. my question is does any one know where to find a volume spec ? I searched mod and alldata and can't find a...
2001 Saturn L300 3.0L Hesitation, Surge VIN: 1G8JW54R21
Has anyone ever seen bank 1 and bank 2 almost exact opposites of each other? Meaning, this vehicle shows short term fuel trim at about 25% on bank 1 and -25% on bank 2 (+/-10% depending on load) There is no way the harness is capable of having the front O2 sen...

Fixes & Summaries for GM
Fix/Summary Answers
1999 Buick Century Custom 3.1L evaporator VIN: 2G4WS52MXX
According to the 47 pages of info that Mitchell faxed me, don't know why they don't put this info in there disc isn't that what we pay for? Anyhow it does say you need to pull out the brace, what A pain, time for this is not enough, so if you shove the brace t...
1988 Chevrolet Corvette 35th Anniversary Edition 5.7L Alarm VATS VIN: 1G1YY2181J
Well guys like always IATN really rocks, I really appreciate your time and valuable information and inputs, like everybody knows this injector disable signal from VATS module it is hard to be reproduced, but someone here mention that He have installed a bypass...
1994 Chevrolet Corvette 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Misfire VIN: 1G1YY22P9R
Thanks to everyone who responded! Checked OPTI spark drain, plugs and high and low resolution signals. (Low Hertz) We changed the distributor, cap, rotor, and wires. I heard that aftermarket distributors were no good, so we cut to the chase and got an oe part....
1995 Chevrolet Corvette 5.7L Hesitation VIN: 1G1YY22POS
Customer decided to go back with an A/C Delco distributor, problem solved. I called Accel tech line and they said that they have not had any issues with there opti spark distributors and that they are an direct replacement. Well I guess I was the first to get ...
2000 Chevrolet Cavalier 2.2L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Misfire VIN: 1G1JC52401
thanx to all. timing chain fixed the running problem, the chain was four teeth off. someone replaced the gear chain + tensioner about a year ago. the tensioner assembly exploded, with the forward plastic a metal guide gone. replaced the parts vehicle runs good...
2002 Chevrolet Impala LS 3.8L starter relay VIN: 2G1WH55K72
Traced cause to pcm. it was not grounding the starter relay at times. ordered and replaced the pcm and flashed latest calibration file into it. This was a confirmed fix according to the GM Hotshot i was talking to. I was also convinced this was the intermitten...
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