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Prev Professional Automotive Repair Technical Discussions for October 7, 2004
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Open Help Requests for GM
Help Request Answers
1994 Cadillac DeVille 4.9L Cuts out VIN: 1G6KD52B7R
When you put engine under load it acts like you have a rev limiter on it. Checked and found that half the injectors are cutting out from ECM. Still have the source voltage, but looses ground from ECM. Any help is welcome. Tried removing servo wiring at ECM and... Trouble codes: P0099, 1039
1989 Chevrolet Camaro Iroc-Z 5.0L MIL Lamp on VIN: 1G1FP21E2K
car has intermittent mil for code 32.lite will come on then go off.check with scanner for codes, only 32. if you try to flash codes it will flash code 12 3 times then when it tries to flash 32 it will start getting very dim then go out completely.have gone to ... Trouble codes: 32 (egr)
1994 Chevrolet K2500 Cheyenne 5.7L Cuts out VIN: 1GCGK24K6R
vehicle was in our shop 2 months ago for identical symptom. I diagnosed a bad speed sensor buffer because it lost the squarewave from the buffer to the computer .we replaced buffer and truck was it's back!the symptom is at cruise speed the truck lose...
1997 Chevrolet C1500 5.7L Pinging VIN: 2TEK19R9U1
We have this vortec 350 that came in for a pinging complaint , Customer has installed a new EGR , knock sensor and full tune up . No codes in the system , data stream revealed nothing out of the ordinary , fuel trim is 128 , O2 sensors tested good , fuel press...
2000 Chevrolet S10 4.3L MIL Lamp on VIN: 1GCCT19W61
veh came in with check engine lamp on , scanned for codes , found cts code , used a dual trace scanner on it and found that every once in a while it would spike up or down , i think this is causing the computer to pick up on it and set a code , replaced cts an...
2000 Chevrolet Astro 4.3L Misfire, MIL Lamp on VIN: 1GKEL19W2X
Hi everyone: This one came to us with a Mil light on. It had a missfire code. Checked the missfire counters and #5 and #4 were missing at wide open throttle, high rpm's just when the trans shifts gears. #5 seems a little worse but they are both missing. Custom...
1996 Oldsmobile Cutlass Supreme 3.1L Poor Idle Quality, MIL Lamp on VIN: 1G3WH12M5T
This vehicle runs fine, but idles poor. I have random misfires on most cylinders but mainly on #2. I thoroughly checked out the EGR system and found nothing. I don't think it is a fuel trim problem. Adding or subtracting fuel does not help. The O2 cycles well.... Trouble codes: P0300
1994 Pontiac Grand Am SE 3.1L dome lights VIN: 1G2NE15M6R
vehicle towed crank.charge battery.start vehicle,check charging charging voltage and battery failed test.replaced battery and alternator.retest.starting and charging system now work.noticed no dome light.checked and found all bulbs missing.inst...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Cadillac Catera 3.0L Blend door ? VIN: W06VR52R1V
Good morning, Well i have checked everything I can without taking the car apart.The heater hoses are both hot going in and coming out.I cannot get to the blend door without taking the dash apart wich I do not want to do because I do not have a lot of info on...
2000 Cadillac Catera 3.0L abs VIN: W06VR54R5Y
Thanks Allan from texas!!! you were correct the EBTCM was defective and the replacement was the fix we found a salvage unit for a resonable price and all is well...Thanks to all three who replied.
1996 Chevrolet C1500 5.7L Misfire, MIL Lamp on VIN: 1GCEC14R8T
thanks to all who posted help messages, the truck has now been gone for about a week with help from you all i found the problem to be dirty valves, i used top engine cleaner and motor vac to clean the dirty valves and customer called yesterday and said the tru... Trouble codes: P0300.
1996 Chevrolet S10 4.3L temp gauge
Thanks For all the help. It seems to be after market themostat a good one BUT NOT factory. Factory did the trick.
1998 Chevrolet C3500 Cheyenne 7.4L Excessive Emissions VIN: 1GBKC34J1W
hey guys i have fixed this truck. all i did was injector clean twice. thank you for all your help guys
2000 Chevrolet Silverado 1500 5.3L No Start VIN: 2GCEK19TXY
Thanks so much for the help from everyone. Most were correct in the suggestion to look in to the theft system. Prior to my shop receiving this vehicle, someone had cleared bcm codes. After the suggestions were made, I attempted to start several times until a c...
2001 Chevrolet Silverado 2500 HD 6.6L Surge VIN: 1GCHK29161
Well, the FP regulator is not under warranty. cost customer $100 to find that out. That's why i'm out of the dealer shops now. crazy. any way, i'm pretty sure the prob. is the FP regulator. FP pid on tech 2 is erratic even with current commanded steady. looks ...
2002 Chevrolet Trailblazer LS 4.2L Rad fan control VIN: 1GNDS13592
The fix was a new fan clutch, as four of the seven replies had suggested. There seems to be a problem with the feedback to the computer on these fan clutches.
2003 Chevrolet c2500 6.6L unknown VIN: 1GTHC24113
You guys are good. Many of the replies stated that GM is having a problem with leaky injectors. They are warrantying the injectors up to 200,000 miles. I took it into the dealership for the injectors and it's now operating great. Thanks.
1996 GMC Jimmy 4.3L hot VIN: 1GNDT13WXT
Thanks to every that responded, after flushing at least 10 times, we replace the radiator. this fixed the problem. The heater core was blocked too. About a week layter, the motor went, was over heated previous. So im into this deap. Thanks everybody your comme...
1998 Oldsmobile Aurora 4.0L Stall VIN: 1G3CR6ZCXW
Thank you to all for the input. Seems replacing the cps (there are 2 identical sensors on this engine) Did the trick. I changed both. It was very intermittent, so I wanted to wait until the customer reported that all is well. Again, thank you all for your time...
1994 Pontiac Bonneville SE 3.8L Fuel Injection Pulse VIN: 1G2HX52L3R
I would like to thank all of people who responded to my request you all gave me the insight to be able to fix this vechicle Okay here we go I went to the key and tumbler as many of you stated and found that there was a wire not broken but the insulation was go...
1994 Saturn SL1 1.9L No Start VIN: 1G82H559XP
map sensor wire returning to pcm shorted thanks to dan h. and everyone for pointing me into the correct direction
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