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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 4, 2004
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Open Help Requests for GM
Help Request Answers
1988 Buick Reatta 3.8L Hesitation, Cuts out VIN: G4EC11C6J8
Have a stalling problem only when cold and only on start up. If I keep my RPM up at start up it will sometimes backfire and stall.It will start up again and hesitate for about 30 seconds and the be OK until it gets cold again. Don't get much time to diagnose b...
1995 Buick Regal Custom 3.1L rear pads VIN: 2G4WB52L2S
Hello to all and thanks in advance. This car was brought to me with the complaint of brakes grinding inrear we replaced 1 rear rotor and new pads. (we were told to do this job as inexpensive as possible). Two weeks later car is back with grinding noise in rear...
1986 Cadillac Fleetwood Brougham 5.0L a/c compressor VIN: 1G6DW69Y2G
looses ground from ecm to a/c cut out relay which gives power to a/c comp clutch, only when accelerating, it will come back on after a while, when the car idles has no problems.
1994 Cadillac DeVille Concours 4.6L Poor Idle Quality, Cuts out, Stall VIN: 1G6KF52YHR
when eng is hot,with ac on,engine stalls.seems to be ign.related.computer grounds seem ok.installed new cam sensor.no change.had bad alt. installed new alt.,seemed better but problem still there.iac motor tries to keep eng from stalling but eng still stalls. a... Trouble codes: 41 (no cam ref signal), 47 (bcm to pcm serial data problem), 52 (def pcm ecu ram chip error), 95 (eng stalled), 109 (int. ecm problem), 107 (bcm to pcm serial data problem)
1991 Chevrolet S10 4.3L Poor Idle Quality VIN: 1GUKCT18ZM
Hello This S-10 has an extremely rough idle on cold start, once it warms up it is fine all day, even after several hours of cooling down. The throttle plate was stopped up, so all that was cleaned out and a new PCV was installed. The problem was still there s...
1991 Chevrolet C1500 Cheyenne 5.7L AC vent doors VIN: 2GCEC19K4M
This truck has clicking sound at the rec. vent door, but the door does close and open, maybe the module is not working right and i do not have any ac air coming from the ac vents , it comes from the defrost or the floor and is not very strong air flow. Do i ne...
1996 Chevrolet Blazer 4.3L lacks power VIN: 1GNDT13W2T
It idles good but has no power when you try to drive it.It acts like the timing is late.When i installed the trans there was a noise coming from the front of the motor like a rattling .Noise was present with t-converter unbolted.this was with about 15,000 afte...
1997 Chevrolet C3500 Cheyenne 7.4L ignition VIN: 1GCHC33JXV
this truck will run great for an undetermind amount of time then starts cutting out runs like a dog, then runs normal, starts its thing again and blows the ecm 1 fuse, no codes, nothing, we changed the fuel pump because it was real noise and pressure was aroun...
1999 Chevrolet Monte Carlo LS 3.1L Cuts out VIN: 2G1WW12M9X
You can drive the car about 15 to 20 miles it starts to buck and die. No engine light. Fuel pressure is 35 to 42 which is okay. Trouble codes: N0NE
2001 Chevrolet Silverado 2500 HD 6.6L Surge VIN: 1GCHK29161
This truck has a light surge of about 100 or 200 RPM's at idle. No codes. does not happen when driving down the road. Power is good. No shifting problems or any other indication any thing is wrong. Starts good at all times. I've looked at the scan data and don...
2001 Chevrolet Suburban 1500 5.3L abs pump runs VIN: 3GNEC16T62
the abs pump motor runs non-stop. truck came in with the 60 amp relay pulled. the motor will also run even with the wiring harness to the ebcm disconnected(this is the one less the two power/ground leads to pump) mod not real clear on the control, but it looks...
1997 Geo Metro 1.0L MIL Lamp on VIN: 2C1MR2269V
Checked for codes found O2 sensor code for rear sensor. Replaced sensor as I could never get anything out of it. All other inputs/grounds were ok at that time. Had to wait a couple of days for new sensor, customer took vehicle and brought back when sensor was ... Trouble codes: P0136 (O2 Sensor Fault Bank 1 Sensor 2)
1995 GMC K2500 Suburban 6.5L speedometer and tach VIN: 1GKGK26F2S
asking for help.this viechel has a problem with the speedometer and tach jumping up and down together.ive scoped the speedometer signal to the buffer all looked well while it was jumping.weve tried 3dash units. ive checked alt out put.battery connections.power...
1999 GMC Jimmy SL 4.3L 4 wheel drive VIN: 1GKDT13W4X
I cannot figure out why my 4 wheel drive will not engage... i have test my front diff actuator and it is good, and so is the cable... but when I had it apart i noticed i had some resistance in the front diff.. from disengaged to engaged.. I applied vacuum to t...
2000 GMC Sonoma SL 4.3L brake booster VIN: 1GTDT19W5Y
Original complaint was a low pedal so I presumed a bad master and pedal is the same. The pedal stops the vehicle OK and seemingly at the correct height. The problem is that the pedal goes low if you hold it down firmly. Other opinions are that it is normal, bu...
1999 Oldsmobile Alero GL 2.4L front end right side VIN: 1G3NL52T9X
when turning wheel hard for parking lot maneuvers you get a thump thump in forward and reverse. when it does thump thump in forward it will not do it again til you put in reverse and move then it will thump thump again until put into drive again and move forwa...
1999 Oldsmobile Intrigue GX 3.5L Excessive Emissions, Stall, Misfire, MIL Lamp on VIN: 1G3WH52H7X
this car will start up runs very poor over fueling injector on time 40-90ms have to keep foot on acc to keep runing mil is flashing at times it will clear up after 15-30 sec of runing and run fine but most of the time it comtinues to run poor when it does clea...
1984 Pontiac Fiero SE 2.5L Clutch VIN: 1G2AF37RXE
I have the above Fiero that will not allow the clutch to disengage fully. I can get it into gear while on a lift, but once on the ground, forget about it. History: Car was driven in by customer for a clutch and sat outside for about a month before work starte...
1996 Pontiac Sunfire SE 2.2L Starting VIN: 1G2JB1240T
This sunfire will stall driving or sitting in bay after 10 minutes,after stalling will not restart right away,no spark no injector pulse,no check engine light,codes 21,22,23 ipc dtc.Check ecm for codes none.All connections at ecm are good.Is there any way to p...
1998 Pontiac Grand Prix GT 3.8L Hesitation, MIL Lamp on, OVERCHARGING VIN: 1G2WP52K1W
thanks in advance, this 1998 gt is overcharging 17 volts, abs and traction light come on, at time air bag lamp blinks. vehicle can be started, let idle, all is well, drop into gear power brake, all is well, after putting in gear and attempting to drive, vehicl... Trouble codes: P0560
1998 Pontiac Trans Sport Montana 3.4L ABS Module VIN: 1GMDU03E5W
This vehicle has been to several other shops,It's problem is Intermittent and has not acted up for anybody long enough to diagnosis.The customer states that while driving the ABS,TCS and brake light will come on and may or may not quit running (as he's driving...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick LeSabre Custom 3.8L Poor Idle Quality, Cuts out, Stall VIN: 1G4HP52L8R
Thank you to all that replied to my help request, I have personally sent each a thank you, but if I missed anyone, Thanks again. Well after doing voltage drop tests on all grounds, I went to the PCM. I ran redundant grounds to the PCM just to be sure, and this...
1996 Cadillac DeVille 4.6L No Start VIN: 1G6KD52Y4T
Well here it is. The vehicle has been gone for a week now and the no start problem seems to be alleviated. but more importantly the oil pressure problem is gone. as some suggested we filled the crankcase with 12 quarts of oil and ran the engine unitl we got oi...
1955 Chevrolet 210 265CID old
Recieved many good spec's, needed the measurements for frame points as car had been wrecked at some time and wanted to make sure frame was sqaure before setting up front end. Must be a lot of guys who still tinker with these old classics as almost everyone had...
1992 Chevrolet Camaro RS 5.0L Poor Idle Quality, Hesitation, Stall, Misfire VIN: 1G1FP23EON
well guys this one got me.i think the problem will be a internal vaccum leak somewhere,or coolant leak perhaps headgaskets???.i do not have gas bench to confirm.the customer has had car a another shop for a week trying to repair,they did not repair anything,ju...
1994 Chevrolet Camaro Z28 5.7L Hesitation, bog VIN: 2G1FP32P8R
We received very good suggestions for this vehicle 2 replied that they had to replace 3 ecms to get a good one for the same symptom others suggested the optispark units were a common problem the owner thought another shop had changed the unit because of the co...
1997 Chevrolet S10 4.3L Unknown VIN: IGNDT13WIV
She brought this Blazer in this morning. Heater core started leaking over the weekend. Replaced it - what a job - and all is well. Thanks for all the responses. Dan
1999 Chevrolet Silverado 1500 5.3L Cooling Systems VIN: 2GCEK19T4X
i am sorry this took so long to post but, i injured my back and have not yet had a chance to repair this truck. i received alot of info on the intake manifold gaskets and i believe that is where i'll head to. that is the only thing that makes sense to me. the ...
1995 Oldsmobile 88 Royale LS 3.8L heat control VIN: 1G3HY52K0S
Hello Group, Only got three replies but two were very helpful. Thanks to JR M. one problem was the programmer , located behind the glove compartment a little pricey over $600 from GM, found a good used, unfortunately I never got any testing info to share. The ...
2001 Oldsmobile Aurora 3.5L power steering effort VIN: 1G3GR64H31
Unable to get vehicle back in shop to attempt repairs
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