× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for April 18, 2008
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM
Help Request Answers
1987 Buick Century Limited 3.8L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1G4AL513XH
This vehicle came in running poor. Warming up vehicle has what I would describe as moderate lean misfire, but when warm runs and idles very poorly, surges badly, almost dies when sitting in gear at stop. We tuned as needed. Removed throttle body and cleaned. A...
1997 Buick LeSabre Custom 3.8L compressor VIN: 1G4HP52KXV
Hi group, This one is a bit tricky in so much as it's very intermittent. The customer says the ac will stop cooling and they can hear a change in the air-flow/blower motor sound(as if the recirculate door changes). They also say the air flow does change positi...
2004 Buick Rendezvous CX 3.4L noise VIN: 3G5DB02E24
I am posting this for another shop. I have never seen the vehicle. The other shop owner has been in the business for a long time, but he says he has never seen anything like this. As the engine warms up it develops a noise out the exhaust, but it doesnt sound ...
1993 Chevrolet Corvette 40th Anniversary Edition 5.7L No Start VIN: 1G1YY23P8P
vehicle towed in no start.customer stated ran great until parked for winter,went to start last week and dead battery.customer replaced battery and would crank but not start..check all basics and found code 41 est/found spark and injector pulse for first 3 seco... Trouble codes: 41 (est open or shorted)
1995 Chevrolet K2500 Cheyenne 6.5L No Start VIN: 2GCFK29S4S
truck towed in for no start, left over night, truck started in the morning. could not find any defficiencies. did wiggle test. tested current draw on fuel pump.modis found no codes.
1997 Chevrolet Express 1500 5.7L Poor Idle Quality, Stall VIN: 1GBFG15ROV
Customer complant vechile engine backfires surges stalls runs rough at idle also sets misfire codes.Also has other listed codes O2 sensor. Trouble codes: P0132, P0135 (h02s heater circuit bank 1 sensor i), P0152 (ho2s circuit high voltage bank two sensor one), P0154, P0155
1998 Chevrolet Blazer 4.3L temp blend door VIN: 1GNDT13W8W
Hi Crew, HVAC/ATC has problem, blend door continues to cycle, hot to cold. Cannot interface with red brick. With Vantage, actuator feedback is showing full travel, EXCEPT when voltage gets near 0, a spike to 5 volts occurs for about 2 seconds, then back to nea...
1998 Chevrolet Cavalier 2.2L Starting VIN: 1G1JC5241X
anti theif light on.. not blinking just on .. no crank. customer said he replaced started... Usally if the ignition cylinder needs replacing it will be atleast blinking. this on is bright red with key in the on pos.. will not turn starter... i replaced starter...
1998 Chevrolet Cavalier Z24 2.4L Misfire VIN: 1G1JF12T5W
car came in w #3 misfire checked compression was 165 pulse width looked good on all injectors plug was oil soaked changed plugs and wires no help changed injector helped at about 2000 rpms misfire goes away but under load its running on 3 cylinders all the tim... Trouble codes: P0303
2000 Chevrolet Astro 4.3L Excessive Emissions, Misfire VIN: 1GNDM19W9Y
With intake gaskets replaced and no ignition problems , only at idle the misfire occurs. higher speed ok Is there any one out there that had this problem or these engine have some kind of internal problem. need help thanks Trouble codes: P0303
2000 Chevrolet Tahoe 5.3L hvac temp door motor VIN: 1GNEC13T3Y
I have tested with good results all circuts except I don't know if the control circut should pulse to change the temp. The voltage at the control wire at the actuator when connected pulses in 2 second intervals or so to drive the actuator warm or cold. I exper...
2001 Chevrolet Impala 3.4L transmission VIN: 2G1WF52E11
Customer says car started, but would not move. Did eventually move. Had towed to shop. I drove around lot with no problems. Has code B2712 gear shift lock circuit low (in addition to two other security codes). I can't find any references to this code.
2002 Chevrolet Silverado 2500 HD 6.0L serp belt VIN: 453BK435OW
This truck came in complaining of belt noise after playing in the mud and water. just off idle the belt has an excessive squeel. As you can see there is nothing else to replace. We changed the tensioner twice with a factory tensoner the second time. If we repl...
2003 Chevrolet Cavalier 2.2L timing chain
car came in with timing chain noise, disassembeld valve cover and ft. cover, found guide broken (opposite tensioner side) and the top bolt for guide is gone (in oil pan likely) looking through bolt access hole in cyl. head I can see the threads are stripped. H...
2006 Chevrolet Monte Carlo LT 3.5L Remote Keyless Entry VIN: 2G1WM15K76
This is my personal vehicle, no problems with remote entry/start until yesterday. Remote fobs worked fine, then yesterday evening neither would work. I started the vehicle yesterday morning with the remote, but last night it wouldn't work to lock. Car starts a...
1994 GMC Sonoma SLE 4.3L No Start, Surge, Cuts out VIN: 1GTDT19W8R
Hello all. I have a 1994 GMC sonoma with a 4.3L V-6 with vin W. When it is running and idling it occasionally idles up and then comes way down or else dies. I drove it today for about an hour and then shut it off for a couple minutes and it would not start aga...
1996 GMC Sonoma SLE 4.3L Surge, Cuts out, Misfire, MIL Lamp on VIN: 1GTCS19W9T
Well heres another one. Truck came in with complaint of no power missing,ect. Plugs ,cap,rotor had been previously changed. Owner also says he has had to replace several coil wires and the injectors. I found the converter to be totally fallen apart inside and ... Trouble codes: P0147
1999 Oldsmobile Bravada 4.3L AC compressor VIN: 1GHDT13WXX
AC compressor is not being commanded to come on. The Compressor clutch relay has power at the #2 and #3 pins as it is supposed to. The ground command from the VCM isn't happening at pin #1 The master tech works very much like a Tech II and tells me an AC comma...
2000 Pontiac Bonneville SSEi 3.8L Stall VIN: 1G2HZ5412Y
Hey everybody this Bonneville is Supercharged. Only when hot the car will stall intermittently, coming off the highway, stop and go traffic, on exit ramps and city driving. The car always restarts immediately. We just cleaned the throttle body and mass air flo...
1999 Saturn SW2 1.9L Hesitation VIN: 1G8ZK8272X
vehicle came in,lack of power on accel and poor shift.miss on #4.did tune up no more miss but still no power,replaced cat because it was giving that burning smell .still no power.had a few where the ect sensor was corroded bad but looks like it has been replac...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Chevrolet Lumina 3.1L No Start, MIL Lamp on VIN: 2G1WL54T2P
Well guys the problem was the module, but the whole computer issue was actual with the Snap On MT2500 scanner with programable cartridges. We luckly enough had a 92 Lumina come in and plugged the scanner up to it and got the same codes. We plugged in the Mat...
1994 Chevrolet Camaro 3.4L No Start VIN: 2G1FP22S9R
Thanks for all the help, and the question of whether one will have a MIL on a vehicle without a flash is yes. The issue was a broken splice/circuit inside harness. Client assumed that the new harness (read salvage) would repair any issues with power and grou...
2001 Chevrolet Tracker 2.0L No Start, Stall VIN: 2CNBE18CX1
replace cam sensor costmer has had car for week. no news is good news .we would have herd by now. thanks for help john.
2002 Chevrolet Astro 4.3L steering column VIN: 1GCDM19X52
Hi guys, Turns out the intermittent noise in the column was the clock spring.We removed the clock spring and drove it quite a while. Although it was highly intermittent, we are confident we have found the odd noise. Thanks Wayne
2000 GMC Sierra 1500 SL 4.8L runs lean VIN: 2GTEK19V7Y
went to GM with a VIN number off a 2000 chev. 2500 6.0L, and they got the program for that truck and put it in, and its running great now
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next