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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for July 14, 2005
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Open Help Requests for GM
Help Request Answers
1993 Buick Roadmaster 5.7L compressor VIN: 1G4BN5379P
the a/c on this vehicle is ice cold, but will become hot while driving. if you punch the gas, it will get cold again. no diagnostic trouble codes and systemj checks out good. what in the world could be happening here??? have replaced just about everything we c...
2001 Buick LeSabre Limited 3.8L No Start, Stall VIN: 1G4HR54K21
hello this vehicle runs fine no problems untill you roll the left rear door window down and then when you try to roll up engine stalles and wont restart. if you unplug door module on left rear door car will start and run fine. have tried new door module no hel...
2001 Buick LeSabre Custom 3.8L air vents VIN: 1G4HP54K51
This car does NOT have dual air,I added freon 12oz.the left side vent air 65-77 deg.right side 29-39 deg.I took the dash out to check the blend door,It is operating correctly by hand and electricly.I plug the dash in layed it on my lap fired up the car and che...
1972 Cadillac eldorado 8.2L cv shaft VIN: 6L67S2Q402
Greatings to all you GM techs. We have this 1972 Cadillac Eldorado here and we need to replace the cv shafts in the vehicle. Was wondering if anyone knows the r&r procedure for this job. I was only 2 when this car was made and my dad can't remember exactly how...
1992 Chevrolet K2500 Cheyenne 5.7L Poor Idle Quality VIN: 2GCFK29K7N
1992 GMC K2500 p-up w a 5.7 K engine. Engine was replaced or overhauled. Shoddy job, plud wires not even properly connected,fixed TBI wires pinched under air cleaner adapter. Problem is bad idle...will go up and down or even stall only when real hot. Everythin...
1993 Chevrolet S10 Blazer 4.3L No Start, Poor Idle Quality VIN: 1GKDT13W0P
Hello everyone at IATN, I'm helping a friend work on his own '93 Blazer. The problem is no matter what we do, we can not get the fuel pressure to go over 25 psi max. We have replaced the pump 3 times, replaced the regulator, and the fuel filter is new. We ble...
1994 Chevrolet K3500 Cheyenne 6.5L Excessive Emissions, Cuts out VIN: 1GCHK39F3R
need some help ok here goes truck came in with a acp code i believe it was a 84 replaced acp module also had a code 78 here is were it gets to the guestion the tech 2 scanner i am using shows boost pressure at 14 lbs at idle under a load will rise to over 20 h... Trouble codes: 78 (wastegate), 88 (tdc error)
1996 Chevrolet Camaro Z28 5.7L sir VIN: 2G1FP22P1T
customer bought car from USA with no air bag installed. have to go through federal inspection in canada.we have to have the air bag working, so i installed an air bag, came up with codes for module, so customer had another camaro that came from canada, install...
1999 Chevrolet K1500 Suburban 5.7L Misfire, MIL Lamp on VIN: 1GNFK16R6X
this suburban came in with ses light on po300-missfire code.missfire monitor revealed cyls.3-4-5-6 missing with 4/5 worst.freeze frame revealed this happened at 71 mph on a hill with a small raft trailer.we have not been able to duplicate this in shop or road ... Trouble codes: P0300
1999 Chevrolet C1500 Suburban 5.7L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 3GKEC16R6X
Came in with running rich (black exhaust). We found thermostat stock open, clogged fuel and air filter, check engine light with codes p0154b, p1153b o2 circuit insufficent activity B2S1 and p300 random misfire. We replaced thermostat, fuel and air filter, O2 B... Trouble codes: P0154, P1153, P300B (cyl. misfire)
2000 Chevrolet Cavalier 2.2L Stall VIN: 1G1JC5242Y
today is 7/14/05 car came back with a stall when hard stering lock right or left. this is a drivers education car. the ac is on at the time of problem only happens in stoped turning parking lot manovers. it is an inertmintant problem not all the time but frequ...
2002 Chevrolet Trailblazer LS 4.2L engine VIN: 1GNDT13SX2
this engine has a knocking noise that is hard to explain,sounds deep like a bearing but seems to be higher in engine. found a tsb about cracked cylinder liner and extended warranty,no infor on diagnosis to prove problem. found nothing in data base - wondering ...
1995 GMC Safari SLE 4.3L Unknown VIN: 1GKDM19W5S
Hi GM Techs, I have this Safari driving me daffy. If you hold the ign. switch in the start position it will crank and crank normally.(No Start) However, if you turn the ign switch until the starter engauges then immediatlly release it to the on position it wo...
1999 GMC C1500 Suburban 5.7L brakes VIN: 1234567989
Upon talking with this person, he said that the brakes have been spongy for some time. The vehicle has 180,000 miles and has had brakes and rotors in the past. I pulled the rotors and resurfaced, replaced pads, insalled both front brake hoses to the calipiers,...
1988 Oldsmobile Delta 88 Royale 3.8L Stall VIN: 1G3HN51C81
vehicle came in for stalling in gear intermit,at first, thought it may be a tcc problem but not the case.car only stalls when it is put in gear at an idle.idles great, but as soon as you put it in any gear it will cut out.it doesn't give any real warning when ...
2001 Oldsmobile Aurora 3.5L ebtcm VIN: 1G3GR64H61
ATTN GM TECHS: This vehicle initially came in with the “ABS" light on along with the “Trac Off" light. I was unable to communicate with the EBTCM, performed some tests, and diagnosed it as bad. That was the easy part. Installing the new EBTCM (Part #[...]) ...
1994 Pontiac Bonneville SE 3.8L Cuts out VIN: 1G2HZ52L7R
Hello again thanks for your time.This Pontiac runs and drives well and is very responsive.In May it came in with an occasional no start ,found questionable crank sensor and replaced the sensor with OEM part. Car stars fine,this week the car cuts out while drvi...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick Regal Custom 3.8L Poor Idle Quality VIN: 2G4WB5517R
I appologized for the late response due to the customer finally returned the vehicle for diagnostic. Thankyou for the many responses and we used each one during the diag. We checked the tps, pcv, a/c switch and intake leak to no avail. We took the computer apa...
1999 Cadillac Seville SLS 4.6L temp of left side
Thanks to all that responded, except Duane, who obviously knows more than all of us, before completely pulling it apart I tried a complete recharge but it didn't get any better.I did find where the cabin filters (3) were supposed to be then I could see a serio...
1989 Chevrolet C1500 Cheyenne 5.7L shift timing
All replies pointed to what I had already checked. After having checked the throttle valve, I put all back together and test drove again. After three stop and goes, trans started shifting fine and I could adjust throttle cable to get shifts where I wanted them...
1992 Chevrolet C2500 Cheyenne 6.2L Solenoid B VIN: 1GCGC24F0N
The fix is finally in. It took a shift solenoid 'A' and a new tcm, and tightening some of the terminals at the tcm, to finally get this problem child out of my hair. After much time spent checking and double-checking the wiring harness we found that a couple o...
1994 Chevrolet C2500 Suburban 6.5L engine power VIN: 1GKGK26F5R
replaced vacuum pump, after receiving all the help. This vehicle now operates as designed. I do appreciate all the help.
1994 Chevrolet Caprice Classic 5.7L MIL Lamp on VIN: 1G1BN52P7R
thanks to all who replied. this vehicle is a fix, even though with limited funds. well anyway it turned out at this time the head gasket isn't leaking and i was able to get the 'pcm' to communicate with my scanner. 1st, rr waterpump (ac delco) & upgrade th...
1996 Chevrolet K3500 Cheyenne 7.4L Cracked Bellhousing VIN: 1GCHK34J8T
My local Chevrolet Dealer warrantied bellhousing. block is flat , dowels in place, all checked fine - works great - i'ii see how long this one lasts? Thanks to all who replied
1996 Chevrolet Camaro Z28 5.7L no fire out of coil VIN: 2G1FP22P1T
It turned out to be the distributor cap, rotor button and distributor. Thanks to everyone who helped.
1996 Chevrolet Corsica 2.2L compressor VIN: 1G1LD5549T
Well, lots of replies about the condensor or radiator being clogged. Most suggested hosing down the condensor and looking for a pressure drop. My radiator did have a couple of clogged spots, but it wasn't my problem. Sometimes you really do have to replace eve...
1998 Chevrolet Express 3500 5.7L No Start
well i looked at everything i could this guy was getting a little crabby with me so i broomed him he went to the dealer if he lets me know what it was ill let everyone know thanks for all the help
1998 Chevrolet Blazer 4.3L hydralic system VIN: 1GNCT18W8W
sorry didn't get back sooner bleed truck how discibed in GM manual. didn't have the tool some of you told me about NAPA & no onelse had it, had to us third person. everything went well bleeding until got to the caliper customer took hose of was geting fluid no...
1999 Chevrolet C2500 Suburban LS 6.5L Air Conditioning VIN: 3GNGC26F4X
My customer has not brought the vehicle back in and is living with it the way it is. The rear air still warms up but the general ac operation is good going down the road. Not really a fix to offer. Appreciate all the suggestions.
2000 Chevrolet Lumina 3.1L Poor Idle Quality, Misfire VIN: 1GNE52JXY6
Hi, before I post some of the responses I would like to say to anyone that responds to any post, KEEP YOUR JUDGEMENTAL AND DUMB REMARKS TO YOURSELF. Techs that ask for help do not deserve to be bad mouthed by anyone. Time and space do not allow a tech to give ... Trouble codes: P0300, P1404.
2002 Chevrolet Trailblazer LS 4.2L ac system VIN: 1GNDT13562
Hey thanks alot guys, I will talk to the customer tomorrow I think he will opt to take it to the dealer. It looks like its going to need a actuator door motor or the door replaced. The dealer has a special tool to do the job without pulling the dash. Thanks ag...
1998 GMC Jimmy Envoy 4.3L control head VIN: 1GKDT13W4W
Thanks to David,Justin, and Frank, the cust. wants to wait 1 month to save up for the new control head(rather pricey at GM) the real clue here is that Frank said the intermittent flashing a/c LED means the control head is bad,it never went full heat it just wo...
1994 Pontiac Bonneville SE 3.8L TCC Lockup VIN: 1G2HX52L8R
Michael was right -- I called around until I found a shop that had experience with fixing this issue (I wasn't comfortable drilling holes in my valve body without knowing exactly what I was doing). They used the Sonnax kit and it now goes into overdrive and th...
1997 Pontiac Trans Sport 3.4L Cuts out VIN: 1GMDX06E0V
I have repaired the Pontiac Transport/Montana. Scott [...] sent a nice idea about the rear/7X crank sensor harness getting misrouted or not secured and burning on the exhaust cross-over. Now I had put a good eye on all the errant looking harness tendrils an...
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