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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for April 6, 2005
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1992 Buick Roadmaster 5.7L No ignition fire VIN: 1G4BN5370N
This is a high mileage car that is clean and good shape, problem seems so simple but is working on us and the tech lines that we tried. When the car warms up it will spin good but no start. Has injector pulse but the ignition will not fire but about 2 to 3 tim...
1971 Chevrolet Corvette 5.7L align specs VIN: 1G1
morning ladies and gents working on 71 vette and looking for alinment specs to finish used to have book that old but cannot seem to find it have to finish car
1989 Chevrolet Camaro Iroc-Z 5.0L Fast/erratic idle VIN: 1G1FP21FXK
Hi guys, I have a possessed Camero. It originally came in running horrible and needed repairs to pass a state emissions inspection. After replacing the egr parts and the o2 sensor, everything but the NOx came in line. After a new cat, all gases passed with fl... Trouble codes: 22 (tps), 36 (MAF burn off sol.)
1989 Chevrolet Camaro RS 5.0L bose radio
Hey GM electrical Gurus. Need some real help with this mess. IROC-Z was stolen and recovered and bose radio and rear speakers w/amps were hacked out. Need help with the wiring that goes to the back of the bose radio. Alldata and Mitchell don't have the complet...
1990 Chevrolet Cavalier 2.2L engine VIN: 1G1JC14G4L
My son's car. Using 1 qt. 10W-30 every 300 miles with almost no visible smoke. At worst when driven at speed. On rebuild, I used name brand US parts, had bored .5mm by very competent machine shop and also machined deck of block. Assembled myself--main and rod ...
1993 Chevrolet S10 Blazer Tahoe 4.3L Hesitation, Surge, Cuts out VIN: 1GNCS13W6P
hi, truck came in after other shop could not fix it. it is acting like it is running out of gas, and surges only at part throttle, when you press more gas it corrects and goes fine. will do it in park reving it sometimes and it will surge up and down at about ...
1995 Chevrolet Lumina 3.1L Safety VIN: 2G1WL52M9S
Good morning Looking for some hints on operation of the power door locks. I have replaced both door switches 2x and they will work for about one weeek. My question is do I just have a run of defective Delco switches or is something else causing my problem. Us...
1998 Chevrolet Blazer 4.3L Surge VIN: 1GNDT13W3W
Thank you very much in advance. I have a very noticable surge at 40 to 45 mph. The RPMs fluctuate from 1200 to 2000 when I hold steady on the gas pedal. It does not have a missfire on any cylinder that I can tell from the master tech scan tool. I did a tps swe...
1999 Chevrolet Blazer 4.3L Hesitation, Surge, Misfire, MIL Lamp on VIN: 1GNDT13WOX
Hello, this Blazer came to us from another shop in a basket. They were going to put in a cam and lifters but owner said no. He authorised us to put in a Jasper reman unit. We did so and owner put on approx 4000 miles with no problems. Now the owner states that... Trouble codes: P0300, P0152
2001 Chevrolet Suburban 1500 LT 5.3L Drivetrain VIN: 1GNFK16T11
Hello Fellow Techs, This Subruban exibits a solid type of vibration that starts around 50 mph and gets worse as speed increases. Removed front prop and vibration is gone. Front prop u-joints feel ok. Slight noise in front diff when spinning left front wheel b...
2002 Chevrolet Avalanche 1500 5.3L p/s pump VIN: 3ENEK13T82
Howdy from sunny Cal, we got us a real pain This 2002 avalanch came in complaining of no steering assist tech ckd system out system verified complaint, tech found no flow or agitation in pump and when he dropped the level down pump made no noise. rec new pump....
1993 GMC K1500 Suburban SLE 5.7L poor A/C VIN: 1GKFK16K6P
Hello techcs, I need a little help with this vehicle. When I turn on the blower at max speed, the quantity of air in the middle of the instrument panel is very poor, in compare with the flow in sides. And when I push the blend button it does't stop at the next...
1998 GMC C1500 Sierra SL 5.7L slipping no reverse VIN: 2GTEC19R4W
never had any problem with truck til this morning... all at once started slipping and no reverse... trans fluid is nice and clean.. no burning smell.. PLEASE help!!!
2000 Pontiac Grand Am SE 2.4L drivers door regulator VIN: 1G2NF52T8Y
I would like to know if there is a service bullitin or better fix for this other than replacing clips and channel?

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Regal Gran Sport 3.8L Upper Intake VIN: 2G4WF52L4S
Some of your responses was great and I thank you for your time in reading it. But some of you didn't read all of it. What was happening, was after the installation of the new Upper Intake. Water was getting into the P.V.C. passage. Looking through the throttle...
1987 Cadillac DeVille 4.1L Timing Chain VIN: 1G6CD1180H
Sorry for delay in posting,was hoping that my GM parts Guy could find me an Original Chain that would fit nicely.I wound up using the Loooose Chain instead of Tight Chain,should work fine,and last long time.Thanx to all Who responded.
1994 Cadillac DeVille Concours 4.6L Poor Idle Quality, Hesitation, Surge, Misfire VIN: 1G6KF52Y3R
WELL, I wish there was instead of a 'Yes I fixed the problem' to maybe 'I think I fixed the problem. I got back out the meters and began once again backprobing and checking signals, I have simu-tec and on labscope portion had two traces and swapped back and ... Trouble codes: 56 (Input speed sensor problem found sensor bad rebuilt trans code gone), 39 (torque converter malfunction speed sensor prob. took care of this prob.), 36 (egr pintle pos. prob. cleared codes and this code wont return.), 94 (shift ratio A problem cleared codes and this code wont return), 110 (internal ecm problem L-terminal pcm fixed this.).
1994 Chevrolet Corvette 5.7L Starting VIN: 1G1YY22P9R
Thanks to everyone that responded. What we found was the age old problem 'human error'. Two wire connectors, exactly alike, in the same area under the dash were switched when reconnected. I really appreciate IATN and all of you for helping.
1998 Chevrolet K1500 Cheyenne 6.5L Excessive Emissions, Hesitation, Surge VIN: 13C5453S9W
I am sad to say I don't have a fix to this job and had to let the job go without a fix thank you for your replies
2000 Chevrolet Impala 3.4L No Start, Stall VIN: 2G1WF55E5Y
All replies would have been helpfull if I hadn't already covered that ground. The actual fix came from a tip from Identifix. Burned contacts in the mechanical ignition switch caused just enough voltage drop during cranking to arm the passlock system. Replacing... Trouble codes: U1000 (class two data link malfunction), U1016 (class two data link malfunction), U1255 (class two data link malfunction).
2002 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52J02
By using the information that was given to me here , I determined that the no start problem was definitely caused by the theft system.I performed the 10 minute re-learn on the VTD system and the car fired right up.After I started it a few times I unplugged the... Trouble codes: P1189.
1992 Oldsmobile Achieva S 2.3L engine VIN: 1G3NL54D1N
special thanks to dennis [...] the problem was #2 injector shorting out i unplugged the injector and vacume came up and it ran smooth pluged in vac dropped and engine rpm dropped and ran rough thanks again dennis
1997 Oldsmobile Aurora 4.0L High idle speed. VIN: 1G3GR62C0V
Thanks to all who tried to help on this one. I have not been able to find the cause of the high idle. Sensors, switches, wiring, vacuum leaks, throttle settings ect. were checked and rechecked. I have recomended the customer take the car to the Olds dealer. Ma... Trouble codes: P0507 (Idle speed high.).
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