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Prev Professional Automotive Repair Technical Discussions for March 13, 2008
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Open Help Requests for GM
Help Request Answers
1995 Buick Park Avenue 3.8L Instrument cluster & HVAC VIN: 1G4CW52K5S
When I got the vehicle in I put my fault finder in the circuit and found nothing. Installed new fuse and road tested. Never did feel an engine miss. Everything is still working. This fuse controls the instrument cluster, door chime & info center according to t...
1992 Chevrolet K2500 Cheyenne 6.5L Cuts out, Stall VIN: 2GCGK29F9P
after replacing turbo on truck, it will now die out after snapping the throttle. the truck will die even at highway speeds if clutch is pushed at high rpm. I checked over all tha turbo and everything looks good. I did find that the lifter pump was dead so I re...
1995 Chevrolet G30 Chevy Van 5.7L Failed HC's Too High VIN: 1GCHG35K6S
Customer Went For Test & Failed Only On HC's By A Little Bit.Actual Reading Was 2.2459 State Limit Is 2.0000.This Van Runs Beutifuly.I Checked O2's To Make Sure They Were Switching Ok & They Were.Checked Injector Pulse Width & Feul Trims All Were In Normal Ran...
1998 Chevrolet Venture LS 3.4L No Start VIN: 1BNDX03EWD
this vehicle is not running. get nothing coming out of relay to fuel pump checked wires and no breaks, replaced junction box where relay is located. at wits end with this vehicle any help is appreciated. Trouble codes: P0230
1998 Chevrolet C1500 Cheyenne 4.3L No Start VIN: 1GCEC14W9W
The truck is hard to start after is sits awhile, more than six hours or so. It cranks real good, has spark, injector pulse and around 60 lbs of fuel pressure. It tries to fire right after you start to crank but then quits tring. If you keep tring to start the ...
1998 Chevrolet C1500 Cheyenne 4.3L No Start, Stall VIN: 1GCEC14W8W
Hello This truck came to the shop on the hook. It would crank and stall. I checked for codes and it had a U1192 loss of communication and code P1626 pass lock data invalid. We pulled shrouds and covers and wiggled the wires on coloum from connector at bottom t... Trouble codes: P1626 (Pass lock data invalid)
2001 Chevrolet Express 1500 4.3L No Start VIN: 1GCEG15W31
Hello GM Techs, I have a van that got towed in for crank no start. Found spark, fuel pressure from pump, but no injector pulse. Also tried to check codes and data with Snap-on Modis and no communication at all. Tried other scan tools and same thing. I checked ...
2001 Chevrolet Cab & Chassis Silverado 3500 6.0L Fuel pump operation VIN: 1GBJK34U51
Vehicle has 2 fuel tanks. Rear tank will not drain down always stays full. Have no info on Shopkey on operation or diagnosing system. Have tested the basics. I can power up the rear pump from the realy so I know wiring is good from front to back. Any info woul...
2001 Chevrolet Venture LS 3.4L No Start, Cuts out VIN: 1GNDU03E71
hi everyone we replaced cam sencor , crank sencor , module fuel pumps working no cam sencor signal has rpm reading only starts when cold , then stalls Trouble codes: P0463
1993 GMC C1500 Sierra SLE 5.7L Cuts out, Stall VIN: 1GTEC19KXP
Runs fine when cold. After reaching operating temp, it will stall on decel or at idle. Will usually restart right away. In the shop it will idle for about 3 min and then just stall as if I turned the key off. Fuel press stays constant. If I unplug the IAC the ...
1999 GMC K1500 Suburban SLE 5.7L MIL Lamp on VIN: 3GKFK16R1X
Hello fellow techs,I have a suburban that is driving me nuts.I have a P0141 that keeps coming back.I have changed sensor twice with delco sensor. I have used a head light to check power and ground,both lit the headlight brightly.I followed the pipe from the ma... Trouble codes: P0141 (Bank 1 Sensor 2 Heater Circuit Fault)
2003 GMC Sierra 1500 SLE 5.3L folding mirror VIN: 1GTEK19T43
power mirrors adjust fine but power folding function does not work on either side. does not have any codes or any other concerns. thanks for any input
2003 GMC Sierra 1500 SLE 5.3L MIL Lamp on VIN: 1GTEK19TX3
I have codes 461 and 463 fuel sender volts high the gas guage reads empty. I changed the fuel pump and sender assembly and for 10 mins the gas gague read full after turnning the truck off and restarting it the guage read empty. I let it sit for a while and the... Trouble codes: 461 (fuel level sender), 463 (fuel level sender volts high)
1996 Oldsmobile Cutlass Ciera 2.2L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G3AJ5545T
car came in missing on cylinder two and dumping raw fuel out the exhaust. confirmed the injector had good pulse (which it did) and replaced the injector under the assumption it was stuck open. well afetr the new injector it is still dumping fuel in cylinder #2... Trouble codes: P0302 (cylinder 2 misfire)
2003 Oldsmobile Alero GL 3.4L Odometer VIN: 1G3NL52E93
We have a odometer that the lady says blinks every once in a while . It also has a code B1365 in the history code too. Has any one seen this? Thank -You for your help
1995 Pontiac Grand Am SE 2.3L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 1G2NE55025
This car has been a pain. When the car first came in the customer had already replaced the coils, module, and plugs. When I checked all four cylinders were running very rich. The car acts like it is missing it runs so rich. All four plugs were black. Checked t...
2000 Pontiac Grand Prix GT 3.8L headrest VIN: 1G2WP12K0Y
I am looking for some help. We have a 2000 Grand Prix GT 2 door that the drivers side seat belt guide got broken off. It mounts to the underside of the headrest with 2 screws.. The problem we are having is we can not remove the headrest to replace this piece! ...
2001 Pontiac Grand Prix SE 3.8L ignition switch VIN: 1CKEG123S1
key will stick from turning to off position intermittantly in wifes car. I removed the shifter knob but it still occurs. wait for a couple to a few seconds, sometimes more, and it will release and turn back to off position and come out fine.. any pontiac guys ...
1997 Saturn SL1 1.9L Ignition VIN: 1G8ZH5283V
This car was pushed from another shop. They had installed another engine, the car ran and test drove, mechanic pulled car back in to fix ground wire at the back of the engine, and apparently the ground hit the positive wire on the starter, sparked, and the car...
2000 Saturn LS1 2.2L No Start, MIL Lamp on VIN: 1G8JU52F4Y
Car came in as a no start. We have fuel pressure, injector pulse, and spark. The spark appears to be a litle weak (won't reach end of coil boot on either coil). Plugs were wet, had low compression on 3 & 4, over 120 on 1 & 2. Oiled 3 & 4 and got over 100. Car ...

Fixes & Summaries for GM
Fix/Summary Answers
1990 Cadillac Fleetwood 4.5L digital guages VIN: 1G6CB5339L
one of the first things that I checked on the car was that the 16 volt wire going to the radio was not shorted to ground or that the radio was bad I pulled out radio which is after market and found that the wire was not connected to the after market steroe at ...
1993 Cadillac Eldorado Touring 4.6L Poor Idle Quality, Misfire, BACKFIRE VIN: 1G6EL1291P
Thanks everybody for your help and advice. Many people here on the boards and other people I talked to felt that it could be fuel related, as in a leak in the fuel rail/injectors. I was very sure it was not, because I had a fuel gauge on it for almost an ent...
1995 Chevrolet Monte Carlo LS 3.1L MIL Lamp on VIN: 261WW12M3S
Thanks for our help, guys. Most of you pointed toward carbon in the intake passage, some found broken wires ar poor connections. Mine was carbon in the passage. A badly frayed spedometer cable in the drill went into the passage and some good sized chunks di... Trouble codes: 77 (egr solenoid 3).
2001 Chevrolet Silverado 1500 4.8L MIL Lamp on VIN: 1GCEK19V01
Replaced the intake manifold gaskets and both knock sensors.Knock sensors were full of water cleaned and replace them,intake gaskets were hard and flat,customer very happy now I thank all of you that helped me out with this wish yall the best of luck in this v... Trouble codes: P0171, P00, 174 (fuel lean bank 2).
2001 Chevrolet Silverado 2500 HD 8.1L all gears VIN: 1GCHK29G11
Thanks for the replies, but they all covered items & areas we had already tested. As said in original post the only DTC that kept recurring was P1571. We ran the diagnostic procedures forward, backward & sideways with the same result "Replace TCM" but I just ...
2002 Chevrolet Impala 3.4L anti-tehft VIN: 2G1WF55E62
Thanks Dan [...] was stupid did'nt perform the relearn properly I was,nt going to crank positon every time.Thanks for your time its out of here.
2002 Chevrolet Tahoe LS 5.3L Poor Idle Quality, Misfire VIN: 1GNEK13Z12
Thanks to all that replied. This vehicle has not return as of this date and the repair not made. About half of the response's I received suggested intake gaskets followed by leaking fuel regulater. This vehicle will return when the condition presents itself ... Trouble codes: P0300 (Multiple Cylinder Misfire).
2003 Chevrolet Impala 3.8L rotors VIN: 2G11WF55K3
Thank You All for your replies, most said never turn these rotors always replace, well we put 4 brand new Raybestos rotors ( the good ones) brand new Raybestos pads on front and rear.customer drove for 300 miles with no problem, we re- checked for run-out on r...
2004 Chevrolet Silverado 1500 4.3L Misfire
Thank you to everyone who took time to assist me. The problem was from a plugged catalytic converter as many people had suggested. I did not know that this truck with a V6 had two converters. I received many helpful and detailed suggestions that contained g... Trouble codes: P0300, P0101.
2004 Chevrolet Cavalier LS Sport 2.2L rack&pinion VIN: 3G1JH12F84
As many of you suggested I shut vech. off at speed the pull stopped, replaced rack&pinion and all is well! Once again iatn rocks! Thanks KEVIN
2007 Chevrolet Silverado 2500 HD Classic WT 6.0L transfer cas VIN: 1GCHK29U07
The general thought was a fluid issue. Not being full or wrong fluid. The trans shop thinks it is a magnet that is located under the pickup tube. The material that is being attracted to the magnet is another problem. I will check and change the fluid in thes...
1997 GMC C2500 Sierra SL 6.5L No Start, Stall VIN: 1GTGK29FOV
First of all I would like to thank those who replied. Everything pointed to the PMD and as most of you know there is no test for this. I picked up a module from the local Stanadyne shop for 279.00 and made my own bracket. The bracket mounts on top of the upper...
1997 Pontiac Bonneville SE 3.8L Blower VIN: 1G2HZ52K3V
Hello Everyone. First I would like to thank everyone who responded to my call for help.Well it has been a couple of weeks and I have not had this vehicle come back. as I stated in my post That I had tried a control module and that was not the problem. In the w...
2000 Pontiac Grand Prix GTP 3.8L MIL Lamp on VIN: 1G2WR5211Y
Well, unfortunately the customer said they would return for futher diagnosis; and I waited as long as I could, but IATN want's a close. I did have lot's of usefull pertinent information from a few people: Bob [...] gave me great information regarding the hi ...
1994 Saturn SL 1.9L Misfire, MIL Lamp on, #4 cyl in 4th gear
Thanks guys for all the replies. what it took to repair this vehicle was to decarbonize the engine three times. The reason it was so carboned up was not only the fact that it had 100,000 plus miles but also a defective thermostat that was stuck partially open ... Trouble codes: P0300, P0304.
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