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Prev Professional Automotive Repair Technical Discussions for April 28, 2009
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Open Help Requests for GM
Help Request Answers
1985 Buick Century Limited 3.0L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G4AL19E8F
Thank you in advance for any help.This car will surg-idle rough-then idle ok at times-you can start the car and just let it set and idle and at times it will stall like somone turned the key off.Im not real sure what to look for on this 42 code-electronic spar... Trouble codes: 42 (electronic spark timing problem), 34 (map sensor circuit problem)
1999 Buick Century Custom 3.1L evaporator VIN: 2G4WS52MXX
Does anyone know the correct procedure to remove the evaporator from this car? Mitchell is pretty much useless.Gives a time of 7.4 to change.Makes no mention of removing cross brace or pedals. got the day sunk in removing Instument panel & misc. According to p...
1991 Cadillac DeVille 4.9L Excessive Emissions, Poor Idle Quality VIN: 1G6CD53B0M
i have blocked off the egr, unpluged the evap line ,checked for leakage at the fuel pressure regulater .
1999 Cadillac DeVille 4.6L Electronic VIN: 1G6KD54Y2X
i havent delt with alot of these systems but here goes. this caddy when heat is on is hot on drivers side and cold on pass side. i have it set to defrost but it comes out floor on drivers side and defrost on pass side...anyone run into this...i put a new blend...
2003 Cadillac CTS 3.2L stability control VIN: 1G6DM57N33
Hi techs. I have a 2003 Cadillac cts. Came in with a c1241. I tested the solenoid at the gear and found it shorted to ground. I replaced the solenoid and came up with code c1287/ I then performed the steering wheel position test. It passes the test. So where d...
1995 Chevrolet Blazer 4.3L Poor Idle Quality VIN: 1GNCT18W45
got this vehicle in smells rich, last one of these i got had a leak down of the inj spider harness. desided to run compretion test and found 80 psi on all cylinders give or take 5psi. this seam real low. just wanted to see what you experts think. stop and put ...
1995 Chevrolet K2500 Cheyenne 6.5L Excessive Emissions, black smoke VIN: 2GCFK29S5S
truck blows heavy black smoke under med to heavy acceration. replaced map sensor no change, reolcated the inj control mod to cooler location no change, checked the boost sensor, testing wiring to sensor, short from ref volt to signal 220kPa and from ground to ... Trouble codes: 33 (map sensor input high)
1995 Chevrolet Corvette 5.7L No Start VIN: 1G14422P7S
Hello GM tech's. This Corvette has spark, compression, fuel pressure and injection pulse. Cranks over at a normal speep and sounds like it has compression. This is one of those half breed OBDI with an OBDII connector. Every so often the engine does run backwor... Trouble codes: 24 (vss), 34 (map), 44 (Lean Exhaust), 54 (Skips over)
1998 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W7W
This thing is driving us crazy.It was towed in as a no start.Cranks fine but backfires through intake,and when this happens the rpms jump up to 7500 on scanner.If you keep cranking it acts like it wants to start but won't,even on carb cleaner.Fuel pressure is ...
1999 Chevrolet K3500 6.5L fuel gauge VIN: 1GBJC34F6X
this had just started jumping back and forth (space is 1/8 on the gauge) no matter how much fuel in in the tank to me it seems to be a short but have looked every where for a short replace the fuel control mod and relay that controls fuel levels in the rear ta...
2001 Chevrolet p 30 5.7L MIL Lamp on VIN: 5B4HP42R01
We have a truck with a 5.7 that wount pass emmistions due to a code p1345. The problem we are having is that out of two scanners we have it doesnot list a diffintion for this code. IATN doesn't even list it, thats a first. If any one knows this code please hel...
2001 Chevrolet Impala 3.8L information center VIN: 2G1WF55K71
Data stream shows no funny reading on engine or ABS but still getting codes and warning lights in the information center. Could this be a BCM problem and if so how do I check it ?? Thanks for any ideas on this one.
2001 Chevrolet Silverado 2500 HD 8.1L Stall VIN: 1GCHK23G81
hello group 01 chevy 2500 with an 8.1 need to get broken crank sensor out of the block, i am thinking i will need to pull the trans then push the sensor out, does anyone have a better way. read about another guy that removed the oil pan but ended up pulling tr...
2002 Chevrolet Malibu LS 3.1L abs VIN: 1G1NE52J52
All right I have this malibu it came in with a customer complaint of an intermittent abs inop complaint. At the time the car came into our shop the abs light was not on. Pulled history codes in the ecbm and got c1226 rf excessive wheel speed variation, and c12...
2002 Chevrolet Silverado 2500 HD 6.6L trans shift VIN: 1GCHK24102
Looking for help on this Allison Trans. Not a Trans. expert here. Truck came in running in 3rd gear, limp-in mode. Codes P0748 and P0872 were present. P0748 was a shorted A solenoid, dropped pan and replaced. Also, replaced both filters and fluid. I thought th...
2002 Chevrolet Astro LS 4.3L Misfire VIN: 1GNEL19X82
greetings to all this astro van had come in for misfire codes.started doing some testing and i saw cylinder 4 misfiring while watching my misfire counters.i swapped plugs and wires with cyl2 and the mis stayed acylinder 4.i proceeded to do a compression test o... Trouble codes: P0300, P0304
2006 Chevrolet Impala LS 3.9L Tire press Monitor VIN: 2G1WV58166
Car has beeb interm. setting light for 6 months,Check it and will have code for 1 wheel check press good have reset and drive and will be good for week or two.have reset with O.T.C tool,Tech 11,and w/car horn chirp,remote.Did have 1 bad sensor at one time and ...
2001 Oldsmobile Aurora 4.0L random missfire VIN: 1G3GS64C61
I got a 2001 Olds Aurora 4.0l that has a p0300 random missfire code. replaced the plugs and boots and the code was still present. suspected a bad coil pack and replaced bank 2 coil pack. Coil pack did not affect the missfire condition. Missfire occurs on cyls ...
2004 Oldsmobile Silhouette Premiere 3.4L evap core VIN: 1GHDX13E34
customer returned w/inop a/c - very low pressure in system we recharged it, had him return to leak test it and found dye coming from evap drain. has anyone come across repeated failures in these evap cores? van has approx 70,000 miles on it thanks in advance

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Regal 3.8L No Start, MIL Lamp on VIN: 2G4WB14L1N
after trying reman computer, crank sensor, cleaned grounds,ign. module, & cam sensor I have put this one on the back burner for a while. so far nothing has made a difference. Trouble codes: 34 (MAF sensor), 42 (EST error), 43 (EST failure).
1997 Buick Regal GS 3.8L Ignition VIN: 2G4WF5214V
Thanks to all who replied. After replacing the ignition switch, we found a wire pulled out of the connector at the bcm, repairing the connection fixed our problem.
1988 Chevrolet V30 Silverado 7.4L Cuts out VIN: 1GCHV34N8J
Some Bozo had tapped in an alarm or navigation unit, Used the wire from fuel guage, or the connection was loose and affected the circuit stopping the transfer of pumps. Thanks for all who responded. Joe
1998 Chevrolet K1500 Cheyenne 5.7L No Start VIN: 2GCEK19R8W
in my original post I didnot mention the fuel pump was replaced by antoher shop but found the fuel pump faulty. replaced with a airtex assembly problem solved. THANK YOU TO ALL THAT RESPONDED TO MY POST !!! KIRK
1998 Chevrolet Malibu 2.4L Excessive Emissions, Poor Idle Quality, Misfire VIN: 1G1ND52T3W
Thanks to all of you who replied. I did check EGR, as many suggested and it was fine. Like I said in my update, a manual vacuum test (12hg) is what led me in the right direction. Again, I was using the vacuum reading from the scanner, which was 17-18hg, so I n... Trouble codes: P0300 (Random mifire).
2000 Chevrolet Corvette 5.7L Electronic column lock VIN: 1G1YY32G8Y
We repaired this vehicle by replacing the relay which was added as part of the TSB. Problem was you cannot buy just the relay you must buy the kit and GM has none available until June. My dealer tried to locate one but everyone they found was ordered for a car...
2001 Chevrolet Suburban 2500 6.0L Ride control VIN: 3GNCK26U41
Want to thank all of you for the help. One member suggested arnott industries and they have a large inventory BUT not for a 3/4 Ton 4WD. The owner and I have searched the net but the 3/4 ton is the deal breaker. I dont know if it can be un/programmed or not. A...
2007 Chevrolet Malibu LS 2.2L wipers VIN: 1G1ZS57F46
Thanks a lot for your help. The wipers have been working fine for several days now so the customer decided to leave them alone. I am pretty sure it needs a BCM but I would like to see it happen more while monitoring the relay control circuit at the BCM. If ...
2002 GMC Yukon XL 1500 SLE 5.3L Stall VIN: 1GFK16Z52J
Well thanks to all that replied to my request. The customer hasn't been back with the vehicle. I have no information to give you that would help, just the great help from the other techs. Thanks again to ALL.
2001 Saturn L200 2.2L shift interlock VIN: 1G8JU52F41
I got 2 replies about the ground circuit, we checked this and cleaned it. Not the problem. Installed used BCM, no better. One reply asked if the bcm saw the brake comand. Is this shifter unlock comand? If so it is not getting this. PCM not communicating to BCM...
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