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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 12, 2005
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Open Help Requests for GM
Help Request Answers
1999 Cadillac DeVille Concours 4.6L Traction control VIN: 1G6KF5490X
Car came back today - with code C1226 and customer stated it can be in a parking lot manuever or driving in town at 30 mph in a straight line and the traction control activates and they can hear the abs pump running. Customer lets off throttle and steps into i...
1991 Chevrolet K2500 Cheyenne 7.4L Int. crank, no start VIN: 1GBGK24N2M
About a week after the services outlined under "Related Repair History" were done, this vehicle died on the customer and was towed in. Found fuel pump fuse blown. Replaced fuse and it blows again (suspect a short circuit). Disconnected fuel pump, crank engine ...
1995 Chevrolet S10 2.2L Excessive Emissions, No Start, Poor Idle Quality, Stall VIN: 1GCC1445R8
Cranks OK, will rarely start and idle, mostly have to give about 1/4 throttle to get it to idle irraticly, give more peddlie and engine will die. I took timing cover off and chain and guides look good, dots line up. I pulled vacuum on Map sensor while watching... Trouble codes: 33 (Map- Voltage High)
1997 Chevrolet Lumina 3.1L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2G1WL52M3V
engine misses only at idle after fuel trim goes down to @-14% to -18%. idles rough. cyl #4 misfires erratically.#5 misses very little. others don't miss.injector balance showed only 8# pressure drop on #4 cyl. we warrantied that injector now all drop @15# with... Trouble codes: P0300
2005 Chevrolet Silverado 1500 4.8L Hesitation, Surge, Misfire VIN: 2GCEC19V75
Hello friends, My original post was mis timed, as my friend the truck owner went on vacation the following day. Anyway, he's back, and I am scheduling a meeting with him this weekend to try to verify the complaint and run a generic scan on the vehicle. I will...
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...
1995 Pontiac Sunfire SE 2.2L Excessive Emissions, Poor Idle Quality, no communication VIN: 3G2JB524XS
This vehicle failed emissions, checked computer - no communication with any control module. Pulled Mitchell on Demand test for no communication at DLC. Terminal #16 on DLC has B+, terminals 4 and 5 are grounds as they should be. However, It asks to check for v...
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...
1995 Saturn SL2 1.9L Mechanical VIN: 1G82K5278S
hello friends, brake pedal feels normal when first start driving vehicle. after driving for several miles the pedal freeplay starts to disappear and then the brakes are dragging, front and rear, open a bleed valve the pedal drops and the brakes feel good again...

Fixes & Summaries for GM
Fix/Summary Answers
1990 Buick LeSabre Custom 3.8L Hesitation, Stall VIN: 1G4HP54C1L
Thank you everybody for your help. I've FINALLY figured this Buick out. One of the replies mentioned carbon on the back of the valves, so we ran some intake system cleaner through the motor via the injector rail. The car runs much better and fuel trims came do...
1994 Cadillac DeVille Concours 4.6L Connector VIN: 1G6KF52Y6R
Thanks for all the replies, it was indeed the IAT sensor. The sensor clips to the plastic plenum right next to the map sensor. The tech put the actual sensor in his toolbox and forgot about it. Thanks for all the replies.
1993 Chevrolet Caprice Classic LTZ 5.7L Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1G1B00070P
Ended up being a distributor, like most of the guys have said. The magnets would crack and cause a problem at idle. Runs great. Thanks everyone, would have never done it without you. Sasha.
1995 Chevrolet Camaro Z28 5.7L oil pressure VIN: 2G1FP22P2S
Thanks to everyone who took the time to reply, unfortunately customer has decided to sell the vehicle. Doing an exploratory was not their idea of a good time. It seems that worn bearings seem to be the most likly cause. I really liked the idea of the oil press...
1996 Chevrolet p30 7.4L MIL Lamp on, no communication VIN: 1GBJP37N6T
The fix for this vehicle was to wire in a gm 12 pin connector so my mt2500 scan tool could communicate with this PCM.
1997 Chevrolet Corvette 5.7L MIL Lamp on VIN: 1G1YY2260V
I guess i spoke too soon, the service vehicle soon message came on because the coolant level went down. (guess she 'birped' a little) The air pump and check valves repaired the car. The confusing part was that there was air flow, however, obviously, not enough... Trouble codes: P1416 (air injection bank 2).
1998 Chevrolet Tahoe LS 5.7L compressor VIN: 1GNEK13R2W
2000 Chevrolet Tracker 2.0L No Start, Stall VIN: 2CNBE1BC7Y
cam sensor fixed vehicle, finally got to the point we just installed part and prayed, no more dying and crank no start, did talk to vender and they said if it did not work we could return.
2000 Chevrolet Blazer LS 4.3L transfer case VIN: 1GNDT13W7Y
Thanks for all your help. I should have stated that this car had a NP236 Automatic 4wd T/case, as a few people suggested a bad vacuum switch (no vacuum switches on this one). I finally managed to reproduce the symptoms, though the t/case never actually shifted...
2001 Chevrolet Silverado 2500 HD 6.6L Stall VIN: 1GCHK23131
FIXED !!! A BIG THANK YOU to all that replied !! We drained the FULL tank of gas out put in some diesel with some ATF flushed out the lines to filter, put on a new filter bled system, changed the gas I mean oil... Pan was full of gas!!! And bang she was runnin...
2001 Chevrolet Express 3500 8.1L MIL Lamp on, reduced engine power VIN: 1GCHG39G11
one tech replied that he had problems with wiring harness connection on tps switch , i checked all connections and was able to purchase a replacement wiring harness plug for tps part#[...] for 2001 express van hatness changes with year and model. problem ha... Trouble codes: P1220, P1120, P1515.
2001 Chevrolet Silverado 1500 5.3L Excessive Emissions, No Start, Hesitation, Poor Fuel Economy VIN: 2ECEC19T7Y
Well this truck made a butt out of me.First of all after checking the map,maf,inj wave form,and comparing them to another truck same system,LUCKY to have one drop off for a tune up,I determined all electronic and mechianiacal system were a go. So what was left...
2001 Chevrolet Silverado 1500 4.8L Heater Core VIN: 2GCEC19VX1
Many thanks to all replies. Very helpful information. To get to the ac/heater box, the top of the dash does have to be removed for access to the four bolts underneath it. The grab rail has to be removed, removal consists of pushing the white outer clips inward...
2000 GMC Sierra 2500 SL 6.0L fuel gauge, air bag light, horn VIN: 1GTGK29U6Y
Thanks to all who responded. Replaced the ignition switch and lock cylinder. That took care of a couple of the problems. Need to replace the O2 sensor that is bad also. As for the horn, I suspect the clockspring needs to be replaced at this time. Waiti...
2001 GMC Yukon XL 1500 SLE 5.3L Pressure
After 2 afternoons in 90 f plus weather, we were able to determine that it was in fact the fan clutch coming in too late..By the time the fan clutch locked up, it was beyond the point of no return for the a/c although the coolant temp never went over 208 degre...
2002 Pontiac Montana 3.4L engine performance VIN: 1GMDX03E22
Customer has not returned vehicle for repair. Thanks to all who replied.
2003 Pontiac Aztek 3.4L starter,console shifter VIN: 3G7DA03E63
Sorry to close a request without a fix. Customer has been on vaction and has not returned with the vechicle. I did receive 6 replys and I personally want to thank all that responded to my help reguest. The customer had me install a remote starter switch on the...
1997 Saturn SC2 1.9L tcc lockup VIN: 1G87H1274V
Received 2 replies for valve body,1 for eng & trans temp sensors & wire chaffing against a/c line for actuators, 1 for trans input shaft seal if trans had recently been replaced or removed [no]. Replaced valve body & actuator-problem persists. This is not an i...
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