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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for July 25, 2005
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Open Help Requests for GM
Help Request Answers
1994 Buick Park Avenue 3.8L Battery / Alternator VIN: 1G4CW52L4R
Have inspected all the applicable wiring under the hood. According to Mitchell, there aren't any fuse links on this model. Voltage drop across alternator to B+ cable is less than .1V and resistance from alternator to PCM is less than a half ohm. Also haven't f...
1997 Cadillac DeVille 4.6L air distribution VIN: 1G6KD54YXV
Vehicle intermittantly switches air from dash vents when on max ac to windshield while driving.This can happen on acceleration or on braking.Customer advises it will happen when sitting at a stop light also. When this happens no matter what you do with control...
1991 Chevrolet Motorhome 7.4L reverse VIN: 1GBKP37N8M
Hello to all. I have searched the archives to no avail. This 4L80E in a motorhome lost reverse. The transmission showed signs of previous disassembly. I have GOOD forward gears and strong MANUAL LOW so I know my low band will apply. But for the life of me, re...
1992 Chevrolet Cavalier RS 2.2L No Start VIN: 1G1JC1444N
what is happening is im seeing a fluxuatian of voltage at the data link conector 0,3.5,6.5,11.0,3.0, and the motor wont start , only when i see 12 or more then it will start , what i need is a good wiring diagram ,my resorses are bad ,chilten book, can any one...
1995 Chevrolet Tahoe LS 5.7L abs VIN: 1GNEK13K9S
this vehicle came in with a complaint of brakes locking up after a 50-0 mph brake. test drove and found that from 50-0 mph the abs is engaging on dry pavement and then at a full stop the rear and right front brakes are locked to the point that they will not al...
1999 Chevrolet S10 2.2L No Start VIN: 1GCCS1448W
the truck came in one day for no start but it ran fine.did some test anyway found no problem. let them take to drive.truck came back on a hook the next day.battery was dead i replaced ran fine charging system ok let sit while working on outher cars.went back t...
2000 Chevrolet Malibu LS 3.1L Surge, Poor Fuel Economy VIN: 1G1NE52J6Y
My customer brought in a 2000 Malibu with really bad fuel economy, no codes and a surge at cruise. Fuel trims look good, cat looks good, EGR is functioning and the car runs out great EXCEPT I can watch the knock retard ramp up to as high as -13 degrees at ligh...
2001 Chevrolet Blazer LS 4.3L electric window VIN: 1GNCS13W51
After replacing the drivers window motor the auto down feature does not work properly. When you press the button the window goes to the bottom and continues to run instead of stopping. You have to push the button to the up position temporarily to get it to sto...
2002 Chevrolet Impala 3.4L Airbag light VIN: 2G1WF55E32
Once again i'm here,end of the line!Chevy came in with restraint lamp always on,scanned module,no codes.Ign volts@10V,followed diag procedure from Shop-Key,diags controller failure.Replaced controller today,still on.Installed known good cluster,still on.Does p...
2005 Chevrolet Silverado 1500 4.8L Hesitation, Misfire VIN: 2GCEC19V75
Hello fellow techs, I am posting this after searching most avenues without a lot of consensus.This truck belongs to my friend Mike, and if it doesn't get fixed soon, I think he's gonna sell it and buy a Titan. I'm trying to get him away from that idea, so her...
2005 Chevrolet Colorado Z85 LS 3.5L Mechanical VIN: 1GCDS136X5
this is wierd this is my personal vehicle it has happen a few times within the past couple of months. after driving for long periods of time 2-4 hours turn truck off and crank/no start let sit for 5-10 mins starts up fine no promblem. this has only happen 2 ti...
1996 Geo Metro 1.3L No Start VIN: 2C1MR5244T
I have a car here that has no fuel and no spark. All fuses check good. I don't have spark from the coil either. Also missing a ground at the main relay. The ground is supposed to come from the pcm. I already replaced the pcm and there has been no change. Still...
2002 GMC Yukon XL 1500 SLE 5.3L steering pump VIN: 3GKFK16Z22
after replacing the power steering pump,the steering is fine off idle.when you are sitting at idle the steering gets stiff only at idle,if you increase the idle speed by 200 rpm the steering is fine.i did not see any kind of switch that would tell the computer...
2000 Pontiac Grand Am SE 3.4L dies&wont restart VIN: 1G2NG12E2Y
my brother inlaw has a problem that his engine dies only after driving for at least an hour when it is hot ([...] or more). After sitting for about 15 min. it will start back up and will run fine the rest of the way home. I have checked for codes and found...
2001 Pontiac Grand Prix GT 3.8L blower motor VIN: 1G2WP52K41
vehicle came in with in/op blower motor; paper wrapped up in blower motor; replaced motor, pulled intergrated resistor pack/high speed relay and checked, burnt circuit on electric chassis, replaced (UP GRADE PART DESIGHN). on key up/start blower motor Takes ab...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick LeSabre Custom 3.8L No Start VIN: 1G4HP52L3R
Thanks to all who responded - I finally found out from Identifix to look for improper voltage at the 3X and 16X terminals from the crank sensor to the module at the module (the ones on either side of the bolt that holds in the connector blue/white & yellow). I...
2003 Buick Rendezvous CX 3.4L No Start, Stall VIN: 3G5DB03E03
Thanks to all that replied,we ended up changeing the ignition relay and after two weeks all is well.I hope everyone is enjoying summer it's been a hot one.Once again many thanks,Glenn.
1999 Chevrolet Silverado 2500 6.0L a/c compressor VIN: 1GCFC29V2X
this is the most irratating thing to have to do but i seem to have no choice. customer does not seem inclined to return so i am going to close this post for now. i received a lot of great information and no one wasted my time. i only put that in there because ...
1999 Chevrolet Silverado 1500 4.8L ebcm VIN: 1GCEC14VXX
After checking battery to chassie ground and wave form of sensor we think Reynaldo [...]
2003 Chevrolet Silverado 1500 HD LS 6.0L pressures
I received several replies on this this one. Most of you confirmed what I thought the problem was. A restricted condenser. I couldnt confirm it because back flushing it, it seemed to have good air flow through it. I also failed to mention that I had changed th...
1972 GMC C2500 350CID overflow tank VIN: TCE2421522
sorry folks ,feeling pretty dumb here ,16 lb rad cap fixed problem .I'm sure that was what we had on originally ,however he had changed a few times with a 13 lb ,just not quite enough .thanks for all the replies .
2001 Oldsmobile Alero GLS 3.4L ride control VIN: 1G3NF52E91
Thanks to everyone for the info. As it turns out, gm sells a grease kit for the steering knuckle. Apparently, they dry up and will pop. I applied the grease and it stopped. I guess now I'll wait and see. Thanks again, Kevin
1994 Pontiac Bonneville SE 3.8L Stall VIN: 1G2HX52LOR
After checking all the grounds and testing the ignition module, coils, and wiring harness, which were all good. I plugged in a different ECM and tested it and it works perfect. Thank you to everyone out there who helped with this diagnosis and the rapid respon...
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