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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for May 17, 2004
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Open Help Requests for GM
Help Request Answers
1988 Chevrolet Camaro Iroc-Z 5.7L Poor Idle Quality VIN: 1G1FP2182J
Compailt Engine lamp on Case Code 34 MAF low . some one already replaced with a new MAF sensor I checked 12volt at sensor and it has 5 volts at other pin also 12 volts at burn off pin after shut down. Scoped sensor show 5 to 8 gs at idle . not sure if it's co... Trouble codes: 34 (MAF low)
1989 Chevrolet S10 Blazer 4.3L Poor Idle Quality, Intermittent MIL VIN: 1GKDT13269
This blazer has an intermittent rough idle when started cold and sets a code 33 (Map sensor). When warm runs great all powers and grounds check out ok. Coolant sensor and EGR function normaly. Is it possible that the injector could have a small enough leak to ... Trouble codes: 33 (Map sensor)
1991 Chevrolet Firetruck 552CID Cuts out VIN: 1K9AF4489N
6V92TA Detrioit Diesel in a Kovatch Firetruck. I can raise RPM's to about 1300ish and the engine will drop back to idle. Even with my foot still on the gas pedal. If I remove my foot from the pedal, I can try to accelerate once again but I only get to about 13...
1991 Chevrolet S10 4.3L Brake light VIN: 1GCCS14Z9M
Good day The truck came in with the brake light on in the dash. Replaced leaking wheel cylinders and bleed brakes. After repairs were made the brake light would not go out. The only way to make it go out was to disconnect the battery. I removed the connecter ...
1995 Chevrolet Camaro 3.4L code 38 VIN: 2G1FP22S9S
this car has "abs inop" and red "brake" light on solid. code 38 & 86 are present and reset immediately after clearing. mtod flow chart states to pump pedal to release vacuum and then use tech 1 to apply motor, see if pedal falls, if so replace abs motor pack. ...
1996 Chevrolet Monte Carlo Z34 3.4L MIL Lamp on VIN: 2G1WX12X0T
complaint by customer CHECK ENGINE LIGHT ON found code P0172 system rich & LTFT @ -20% / STFT 8 runs like a 3.1L instead of a 3.4L (a little weak) please see history and specs @ bottom of page...I would like to add that the vacuum gauge wandered 1/2 inch back... Trouble codes: P0172 (Engine rich Block learn at -20)
2003 Chevrolet EXPRESS 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GBJG31083
Van came in with mil on , cylinders 4 & 6 were dead, we replaced all the spark plugs & wires & coils for cylinders 4 & 6. Customer returned next day with missfire again. All cylinders on right of engine 2,4,6,8 all showing missfires on scanner. We replaced all... Trouble codes: P0300
1997 GMC K3500 Sierra SL 6.5L 4th gear VIN: 1GTHK33FXV
hello all..this truck will jump out of 4th at different speeds..as long as your foot is on the throttle pedal the truck is fine..if you let off or change grades etc. the truck jumps out of gear..when this happens the speedometer jumps all over the place and th...
1998 GMC K1500 Sierra SL 5.0L 1,2,3,4,5 shift VIN: 1GTEK14M7W
Hi Guy's this one is being a real pain.cust complained of a noise on a 2-3 & 3-4 up-shift only.when we took it for a drive it felt like a bearing was going on the counter-shaft in the tranny,it only was doing it after you changed gears (as it was going into th...
2002 GMC Sierra 2500 HD 6.0L Spark Knock VIN: 1GTHC29UO2
This vehicle has a severe spark knock during start up, problem happens hot or cold, noise is slightly worse when engine is warm. This is the only time that the noise happens, there is no pinging or spark knock when driving or accelerating. Customer thinks that...
1995 Oldsmobile Achieva S 2.3L Hard Start VIN: 1G3NL55DXS
Customer came in Sat. He states car is getting worse. Started maybe three months ago, during cold weather, so he let it slide. Didn't have a chance to check anything then, but he will be bringing it in Tues. or Wed. to drop off. What would be the most likley t...
1997 Pontiac Trans Sport 3.4L Surge, Stall VIN: 1GMDX06E2V
need help. vehicle came from another garage, garage told customer that it possibly needs a pcm or reflash. vehicle surges real bad at take off from light. fuel pressure doesnt drop but the fuel pump is growling a little louder than normal. tryed to check for p... Trouble codes: P0706
2000 Pontiac Grand Am SE 2.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G2NF12T7Y
This car came to me with a loud rattle in the front of the motor and an intermittent misfire on #1 cylinder that got better as it warmed up. I decided to replace the timing chain tensioner, chain and gears. This eliminated the rattle but it did not eliminate t... Trouble codes: P0301

Fixes & Summaries for GM
Fix/Summary Answers
1996 Buick LeSabre Custom 3.8L No Start VIN: 1G4HP52KIT
Hi group, I had 30 replies, special thanks to Shawn from Wyoming, and John from Missouri with details. the problem was brocken wires near lock cylinder.i was expecting my snap on scanner will detect this, or PCM w'll set a memory code regarding VAT system. t...
1990 Cadillac DeVille 4.5L No Power VIN: 1G6CD5334L
My frustration was getting to me when i posted this problem and somehow checked the TBI Fuel Injection, instead of the MPI Fuel Injection, which Jerry [...] pointed out. I got an email from Nate from Washington that reminded me to get back to the basics. ... Trouble codes: 41 (Camshaft sensor signal not present at ECU).
1986 Chevrolet Corvette 5.7L MIL Lamp on VIN: 1G1YY078XG
I would like to thank all of you who replied. Mark, Manuel, and Chris. all of you gave helpful hints. the fix wound up being to replace both of the relays, the burn off relay and the MAF power relay. Chris sent some very detailed testing procedures that were o... Trouble codes: 36 (MAF sensor burnoff function fault 5.7 Y).
1989 Chevrolet Camaro Iroc-Z 5.0L low power(?) VIN: 1G1FP21E1K
Well, - I have finally determined that there really isn't anything wrong with this car, but that the customer is just expecting too much from what he has. The general consensus from the replies I received is that what he really needs is about 45 more cubic inc...
1991 Chevrolet S10 Blazer Tahoe 4.3L steering VIN: 1GNDT13Z7M
hey guys well didn't get this thing fixed. several guys i think had the right idea. suggesting that the idler may be out of adjustment. the center link did appear to be lower on that side but it could not be leveled by loosing the bolts. something still strang...
1994 Chevrolet K3500 6.5L Runaway throttle VIN: 1GDKC34F1R
First of all,, let me say 'thanks' to all that took the time to respond!!! Everyone had the correct diagnosis/info.. BAD INJECTION PUMP!! Big problem for GM 6.5's for failures, and repeat failures.. I knew that being this was a high mileage pump, it was alread...
1999 Chevrolet Astro 4.3L trans solenoid VIN: 1GKEL19W3X
Well we really shot ourselves in the foot with this one-as stated in the repairs tryed we ran a new wire from the pcm to the trans connector-however the 'new' wire got against the exhaust manifold and shorted to ground-AAAAARRRGGGHHHH-ran another new wire 'cor...
1999 Chevrolet Express 3500 5.7L front calipers VIN: 1GBJG31RZX
This one has been gone for a couple of weeks, I installed factory brake pads and that seemed to make the difference, it still felt ever so slight pull, but have not heard any complaints, factory brake pads on these from now on. I would like to thank Nick, Taku...
2000 Chevrolet Astro 4.3L trans/abs? VIN: 1GNEL19W3Y
thanks for all the help. i beleive the problem is in the transfer case as there is a considerable amount of metal in the oil but the customer backed out and ran when he heard the rebuild time cost, ( its not that bad) thanks iatn techs
2000 Chevrolet Silverado 1500 4.3L Surge, Cuts out, Misfire VIN: 16CEC14W5Y
Thanks for all the help. As many of you suggested I replaced the fuel pump with 55 psi thought sure it would fix the problem. But after replacement same problem. After further testing and remembering old typical HEI type failure replaced ignition module and cu...
1998 Oldsmobile Bravada 4.3L Accessories VIN: 1GHDT13WW2
Well this is fixed .it was the circuit board as many suggested, seems the reman company must not check them since I had two bad ones in a row .After checking all the wiring I put in a brand new circuit board and all was good Napa will pay the difference on tha...
1998 Pontiac Trans Sport 3.4L Electronic
First I would like to say thanks to everyone who replied, The range switch took care of the problem, I looked at the terminal contact and the harness for chafing as suggested, no problems. Have a good day.
2000 Pontiac Grand Prix SE 3.1L trans shift VIN: 1G2WK52J6Y
Thanks for the replies on the erractic vss. It is reassuring to here from ones who feel I'm heading in the right direction.If the customer will bring the car back I plan to check the tight wiring harness first. Also the rerouted plug wires were an interesting ...
2001 Pontiac Aztek 3.4L Cooling fans VIN: 3G7DA03E41
Many thanks for the replies recieved. I guess I should have added that the vehicle will reach 245deg without the fans activating. The PCM was at fault. This was the only problem with this vehicle. Noone had experienced this but I was reassured by the res...
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