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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for February 9, 2007
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1990 Buick Century Custom 3.3L Excessive Emissions, Surge VIN: 1G4AH54N6L
We got this from another shop. They installed a new Cat. This car is in for a failed Emission test. NOs failed. We do NOT have a gas analyzer. What I do is get the car running correctly, then take it for a retest myself. When in open loop the car runs and id...
2001 Cadillac DeVille DTS 4.6L gauges VIN: 1G6KF54951
Hello, this 2001 Cadillac DTS Deville has a reoccuring problem. Approximately 4 month ago it had to be jump started. Upon checkout no problems were found but battery was replaced. Today the same thing happened. Yesterday it drove fine, today completely dead. A...
2002 Cadillac DeVille 4.6L abs VIN: 1G6KF57392
the stability light comes on after driving car for approx. 1000 feet. the suspension system has been tested and everything looks good all sensors are in spec also the abs system and all systems check out good, what are we overlooking? thanks ron
2004 Cadillac Escalade EXT 6.0L tpm sensors VIN: 1JU7459302
Hey guys and gals. God bless all and thank God for IATN!!! This isn't a specific technical repair help request but this escalade brought forth a major expense to the shop. When our tire technicians break and mount the tires we use euro paste. Recently we have ...
1996 Chevrolet S10 2.2L OBDII monitors VIN: 1GCCS1449T
Scanned PCM and found egr, cat and o2 monitors hadn't cleared. Drove the truck following the drive cycle from MOD to a T. After about 50 miles, got the O2 and Egr to clear, but no cat. "Heated" cat goes to ready early. After about 100 miles of driving "by the ...
1996 Chevrolet Tahoe LS 5.7L Hesitation VIN: 1GNEK13R3T
Vehicle hesitates at 45mph-48mph cap rotor wires plugs fuel pump distributor fuel filter have all been replaced within the last 6 months. Stuck on diagnostoc step.Any help would be great thanks.
1997 Chevrolet Venture 3.4L Door Locks VIN: 1GNDX06E2V
We put a new battery in this vehicle about 6 months ago. They claim ever since then the Electric Door Locks will not work. When you press the lock button there is a click coming from the BCM but nothing happens. Same goes with the remote, BCM clicks but nothin...
1999 Chevrolet S10 2.2L Hard start VIN: 1GCCS1441X
This truck has a very hard start when it is shut off and sits for over half an hour.All the spark plugs were fouled black with fuel.The fuel presure is good and seems to be holding presure.There is nothing on the scan tool that is out of specs.The Long term fu...
2000 Chevrolet Express 2500 5.7L speedometer VIN: 1GTGG25R7Y
Greetings. this van came in for idle concern. found the usual GM pcm full of corrosion under hood. Replaced pcm & idle returned ok. Customer returns with no speedo. Check output of pcm connector c4 pins 3 &4. They are both vss outputs. One goes to speedo & one...
2001 Chevrolet Silverado 2500 HD 8.1L Mechanical VIN: 1GCEHK29G8
This 8.1 engine uses a LOT of oil. A quart per 50 miles type of consumption. I know it doesn't have a PCV valve, but can someone explain how the crankcase ventilation system works? There is a tube on the underside of the intake with a metered orifice that sits...
2002 Chevrolet Trailblazer LS 4.2L t-case VIN: 1GNDT13S12
From another shop, had code 321 / 327, they replaced encoder motor ( non functional) only too find out interenal damage had been done. We recieved and replaced unit with a reman. Installed the new encoder motor they had replaced. Here is the drill, hope someon...
1997 GMC Yukon SLE 5.7L 1-2 Shift VIN: 1GKEK13RXV
this vehicle came in for a trans shift concern. test drove and found that the tran had no 2-3 shift unless you let up off the accellorator. then it would shift hard into 3rd. the fliud was very dirty. I found alot of info to cause me to replace the transmissio...
2001 GMC Savana 2500 5.0L MIL Lamp on VIN: 1GTFG25M51
Hey There I have a MIL light on, customer complains about cutting out and hesitations but I have not experienced any. I connect Genisys and Snap-On Scanner using both GMC and Generic options on both scanners and get "No Communication" check fuses and wiring....
2001 GMC Yukon XL 1500 SLT 5.3L Drain on Bat VIN: 3GKEC16T31
Inadvertent Power Timer in the BCM times out after 20 minutes, and then the BCM will reset the internal timer and reactivate the inadvertent power relay by grounding the control circuit. This puts a constant 125m amp drain on battery, running it down in 3 or 4...

Fixes & Summaries for GM
Fix/Summary Answers
2003 Cadillac CTS 3.2L Stall VIN: 1G6DM57N73
Customer is going to sell car at the auction. He does not want to spend any money fixing it . Thanks for the help. Trouble codes: P0638 (TCA Command Performance), P2119 (Throttle Actuator Control Throttle Body), P2101 (Throttle Actuator Controll Motor Circuit).
1997 Chevrolet C1500 5.0L brake pedal VIN: 2GCE19M0V1
I replaced the front calipers and bled the system with 2 gallons of brake fluid. The pedal got allot better. In my opinion still wasnt great. Suspect bad dump valve in abs pump. Customer said it was ok for now. Thanks for the help
2001 Chevrolet Silverado 1500 4.8L Return hose VIN: 2GCEC19V41
Yes folks, it's a fix. Got 9 top notch excellent replies. Bill suggested looking at valve in pump which we did to verify it was correct. Duane from Alberta had seen a couple of these before and suggested double clamping the lines which we did on the new cooler...
2003 Chevrolet w5500 .0L exhaust brake
Thanks to brent from Michigan and jay from geogia The vehicle was a chev delivery truck with isuzu engine.The customer was getting a loud air sound like a huge vacuum leak which sounded like it was coming from the rear lower part of the tilt cab that sits over...
2003 Chevrolet Impala LS 3.8L abs tcs VIN: 2G1WH52K03
will i replaced both rear wheel bearing assemblys and problem is solved, i was just a little nervios that both would be bad at same time and i wanted to make sure that i wasn't missing anything. thanks for the help
1984 Oldsmobile Cutlass 3.8L heater
Well I did not fix this vehicle. Even after thermostat and housing,heater core and valve, radiator, waterpump, flushing system ,removing water nipple in intake and probing with coat hanger.Blowed out passages when wp was off. Still I have no heat unless unhook...
1989 Pontiac LeMans LE 2.0L Thermostat housing VIN: KL2TR51KB3
Thanks to all for the help. I'm going to call this a fix, although I'm waiting for the part I need. Dan from Texas made some calls and got the Airtex part# that I needed and my local jobber was able to get it ordered for me. Glen gave me a website 'Rockauto.co...
1991 Pontiac Grand Prix STE 3.1L Hesitation, Surge, Stall VIN: 1G2WT54T2M
Thanks to all that responded to my help request. Removed intake plenum and checked injectors to find that they were clogged and full of dirt. Spray pattern was almost a stream on 2 of them. Replaced injectors and vehicle runs great now. Once again thanks to al...
1994 Pontiac Grand Am GT 3.1L trans VIN: 1G2NW15M8R
Well its been about a week and a half with no problems . I disconnected the a/c coil and purge solenoidand explained that other items on this circut could be causing the problem. He declined any more work due to he is getting rid of the car and didn't want to ...
2004 Saturn Ion-1 2.2L Starting VIN: 1G8AG52F84
Well, thanks to Iatn another one is down the road and happy, Thank you all for your advise. Saturn has a tsb published on this problem. Tsb. 04-08-45-005D Says to make sure the igntion switch has been replaced at least once using part number [...]. If not...
2004 Saturn Vue 3.5L Hesitation, Misfire, MIL Lamp on VIN: 5GZCZ53454
Hi, thank you for all the replies. It was the Ecu, I had to get it programmed by Saturn but that is the way it goes nowadays. I am glad that it is gone.
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