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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 4, 2009
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1992 Buick Park Avenue 3.8L No Start VIN: 1G4CW5315N
Hello all and thanks for the help in advance. This vehicle came to shop after owner and friend had tried to do their own repair work (check related repair history). Car had dead battery and bad bat cable bolts, replaced bolts recharged battery and tried to sta...
2004 Buick Rainier CXL 4.2L Compressor will Not Engage VIN: 5GADT13S84
Hello Group todays stumper is reporting a U1000 Code in the Rear Gate Module and The RAS (Rear Audio System NO Comm with the Heater A/c Just beeps the tech II and bounces back to the prevous Menu all the fuses and power & Grounds are Ok Checked the TSB about a...
2004 Buick Rainier CXL 4.2L Hesitation, Poor Fuel Economy, MIL Lamp on, idle surge sometimes VIN: 5GADT13SX7
Hello guys, need your help. When you accelerate from a stop, vehicle bogs and has no power, almost feeling like a clogged catalytic converter. After getting up to speed, it will accelerate a lot better. Tested and found no back pressure. Also at idle speed, in... Trouble codes: P0606 (pcm internal processor fault), P2119 (throttle closed position performance)
1991 Cadillac DeVille 4.9L blower VIN: 1G6CD53B0M
Ok cadillac techs, need some help here. 92 sedan deville originally came in with coplete blower failure. Tested blower motor and at that time it was pulling about 16 amps so I didnt replace it, just the module. No codes from hvac module, replaced power module ...
1995 Cadillac Fleetwood 5.7L rear hvac VIN: 1G6DW52P4S
this car came into today with no cold air coming out of the rear unit, the factory unit works great in the front. checked amount of freon in system, it calls for 4 pounds of freon and it had that amount in the system. felt both lines going to rear unit and the...
1990 Chevrolet R1500 Suburban Scottsdale 6.2L V gauge , fuel gauge, batt light VIN: 1GNER16C6L
90 6.2 Suburban has a fuel gauge reading over full (not) The volt gauge is inoperative , near 0 v and the batt (charge indicator) is lit. AVR test ok good voltage and charge rate The truck has no drivabilty problems. Sound like a dash ground issue to anyone ? ...
1994 Chevrolet Corvette 5.7L Misfire, tachometer jumps VIN: 1G1YY22P9R
Hi all,I have this 1994 corvette that when it gets hot the tachometer jumps erratically at an idle.When the tach jumps the idle goes up to about 1200 rpm and then drops back to normal.This happens everytime the tach jumps.It does seem to misfire when it happen...
1996 Chevrolet K1500 5.7L Misfire VIN: 1GTEK19R4T
calling all gm experts. this one has the whole shop stumped. this vehicle has a constant misfire on cylinder #3 datastream indicates that this misfire is on #4. pcm will not fire injector. depinned pcm, and hooked up a noid light directly to pcm, will not sen... Trouble codes: P0300
1997 Chevrolet Blazer 4.3L ignition lock VIN: 1GNDTBW1V2
This Blazer will not turn the key all the way back. Very interittent. We did replce the lock cylinder last week and seemed to work fine. It will turn almost all the way to off but will stay in between run and lock. This is an intermittent. The old lock cylinde...
1998 Chevrolet Malibu 2.4L Cuts out, Misfire VIN: 1G1ND52T7W
hello all of the iatn techs.. i have this 1998 chev. malibu in for repair...other shops have attempted...symptoms are idles good when you accel you feel it cut back in a pattern..as you accel it does this until shift to second then clears and leaves ck engine ... Trouble codes: P0335
1999 Chevrolet Cavalier Z24 2.2L daytimemrunning lights VIN: 1G1JF12T5X
Have a 99 chev Cavalier with no daytime running lights. Replaced the clutch assembly and after repair customer says drl innop. Can't prove yes or no, never checked before repair. Have repaired MANY of theses drl issues from 1 dim light to no lights at all and ...
2000 Chevrolet Astro 4.3L Hesitation, Misfire VIN: 1GCDM19W7Y
Van was originally towed in for stalling at stops, and missfiring under load. Fuel pressure was low, (52psi)Replaced fuel pump and filter, customer decided to tune at the same time(overdue). Cap and rotor (Delco) wireset, and plugs, Road tested and all was goo...
2001 Chevrolet Express 2500 4.3L Starting VIN: 1GCGG29V23
hey guys vehicle has been to the dealer three times and to a couple other shops i need a little assistance. vehicle will run for a little bit and then it will blow the number 23 fuse which is ENG 1. has anyone seen this problem before . please help thanks
2002 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52J42
This car came in on the hook customer drove to store came out with no start.I have fuel pressure but no inj. pulse or spark checked crank sensor on back of block replaced ignition module. I believe the antitheft only controls fuel.I have no codes either I'm th...
2004 Chevrolet Express 3500 6.0L Poor Idle Quality, MIL Lamp on VIN: 1GBHG31V64
when this truck was brought to us 3 months ago mil light on with a p0157 low b2s2 activity and oe plugs at 85000, we thought it to be a no brainer ,full tune up and 4 new 02 sensors.flash ahead 2 months and we r chasing multiple o2 and lean exhaust codes.repla... Trouble codes: P0171, P0174, P0134, P0154, P0300
2005 Chevrolet Silverado 1500 LS 5.3L service lamp VIN: 2GCEK13T15
Customer has had this problem for quite some time, but very intermittently, "service 4wd" message, flashing indicators on switch, and inoperative 4wd, stores code #C0327 in history, but will never act up when we have it here, thinking encoder motor but would l...
2008 Chevrolet Avalanche LS 5.3L entire vehicle VIN: 3GNFK12358
This vehicle has a driveline vibration from 62mph to 72mph. I removed the rear driveshaft and inspected u-joints. Found rear u-joint completely seized. I thought that was strange for a newer car so I replaced both rear axle u-joints. Thought I had found the pr...
1997 GMC C1500 Sierra GT 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, MIL Lamp on VIN: 1GTEC14W3V
Help,, a good customer bought this from a family member and had the transmission replaced. The vehicle runs poor, shift times are wrong, and ck. engine light is on for TPS out of range. Pulled up on Mitchell and backprobed wiring. No 5 volt reference present a...
2002 GMC Envoy XL SLE 4.2L power lock, mirror, window VIN: 1GKET16S12
This Envoy came in with r/h frt door power window, lock and mirror working. Scanned ecm with Modis - had code u1000, loss of serial 2 data and code u1161 loss of comm with the pass door module (PDM). We pulled out the PDM and it had an obvious burnt smell. We ...
2001 Pontiac Grand Am SE 3.4L MIL Lamp on, VIN: 1G2NF52E51
The vehicle came in with a code p0442 found faulty evap vent valve. Realeased car tpo customer and 2 weeks later with a code p0440 Tested function of vent and purge valve and a smoke test coild not find any leaks or function problems Is anyone aware of ant TSB... Trouble codes: P0440 (evap system)

Fixes & Summaries for GM
Fix/Summary Answers
1993 Cadillac Seville STS 4.6L HVAC displays VIN: 1G6KY5291P
kept setting codes 32 33 34 37 39 as current when it acted up and it would lose all contact with other computers in system then it corrects itself and above codes go into history very intermittent problem and must go on back burner for now as it runs for days ...
1994 Cadillac DeVille 4.9L compressor VIN: 1G6KD52B0R
this caddy is down the road blowin cold. to access codes you press off and warmer simultaniously. then, scroll down with the fan arrow to access the atc (temp system). then, use up fan to scroll values. on ours the low temp. sensor was -39 degrees. the code wa...
2001 Chevrolet Venture LS 3.4L high idle VIN: 1GNDXO3E61
thanks to everybody that replied i ended up replacing the tps with a modified version and all seems to be well Trouble codes: 121 (tps performance), 122 (tps high), 1122 (tps low).
1998 GMC Jimmy Envoy 4.3L 4wd frt axel VIN: 1GKDT13W4W
2008 GMC Sierra 1500 WT 5.3L Poor Idle Quality, MIL Lamp on VIN: 2GTEK19JX8
This was the first time that I ask for help. So thanks for all the advices. After I change the new throttle body, the customer drove the truck for a couple days, and the idle finally went down to 650 RPM, check engine light is gone. Note: just last week I ch... Trouble codes: P0121 (tps vol. doesnt agree with maf.), P0506.
1991 Oldsmobile Cutlass Supreme 3.1L No Start VIN: 1G3WH14T8M
hey guys thanks again for all the help. most of you were right on. replaced all 6 injectors with a/c delco injectors and vehicle is up and running again. kind of expensive for a used car lot vehicle but you have to do what you have to do.thanks again kevin
2006 Other GM P Series 6.0L Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 5B4JPD2U86
We apologize for the delay in posting the fix. We wanted to have the customer drive the vehicle and verify the repair as this was an intermittent problem. We did some more inspection and tracked down the problem to a wiring harness issue. We could finally dupl... Trouble codes: P0300 (Random Mis-fire detection).
2002 Pontiac Grand Am SE 2.2L No Start VIN: 1G2NF12F52
hey guys, thanks for all of the replies. comes to find out the catalytic converter was completely shut down. pulled cat from manifoldand vehicle started right up. replaced cat assy and vehicle would not start again!! dropped entire exhaust system and cleaned ...
2006 Pontiac Wave 1.6L loss of power VIN: KL2TD69636
Sorry it has taken so long to reply. Looks like the problem is not in the engine area. Problem is in the brakes. the two front wheels very difficult to turn. We are looking into the brake problem now. thank you for the help.
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