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Prev Professional Automotive Repair Technical Discussions for August 24, 2007
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Open Help Requests for GM
Help Request Answers
1998 Cadillac Catera 3.0L fuel door and trunk release inop VIN: W06VR52R9W
Hello techs, what a dreaded car to work on. Today will be a good day to fix this one. Vehicle has several issues. first issue and main concern at this point. The Fuel Door and Trunk will not release when you press the dash buttons. However the BCM via Solus i...
2002 Cadillac Escalade 6.0L Suspension VIN: 1GYEK63N02
I have in my shop an 02 escalade rides very rough, almost like the shocks dont work, the shocks are new and the suspension is tight. This vehicle rides so rough that on certain bumps it almost feels like it is out of control. Also the service stabiltity light ...
1962 Chevrolet impala 327CID genarator VIN: 21867L1144
Hey guys we are looking for a wiring diagram for the generator to voltage regulator, wires melted boyond reconigtion. any help would be gratly appreciated thanks. email [...]
1986 Chevrolet Nova 1.6L Excessive Emissions VIN: 1Y1SK1949G
This is a nice one right here. This vehicle came to my shop for a California smog test. Initially it failed for tailpipe, and visual. Originally the tailpipe emissions were gross polluter level for CO (2.8% @ 5015, and 3.42% @ 2525) and slightly elevated HC (...
1991 Chevrolet C1500 Cheyenne 5.7L Poor Idle Quality, Stall VIN: 1GCDC14KXM
Hey all you Chevy/GM guys. I am normally a Euro tech but I have a Chevy that fell into my lap today. The customer complains that it runs really bad when cold. It "hunts" for an idle and almost dies doing so. It hesitates during acceleration. It does this until...
1992 Chevrolet K2500 Cheyenne 6.5L engine VIN: 1GCGK24F1N
I have in our shop a 1992 chevy truck with a 6.5 turbo diesel, it is not an electronic pump so there is not much to this system. This truck starts perfect in the morning and after it sits for a few hours but when it is warm it will not start. I have replaced t...
1993 Chevrolet Camaro Indianapolis 500 Pace Car 5.7L No Start VIN: 2G1FP22P8P
This is a interesting one. Vehicle originally died after customer replaced water pump. He installed "used dist. from a running vehicle". Didn't run so he rebuilt PCM. Vehicle will run(poorly) if you feather throttle. Code 43 then appears. Seems to loose inject... Trouble codes: 43 (esc module or sensor circuit problem), 1NF0
1996 Chevrolet S10 4.3L No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GC1S67X9T
Just fixed a wierd one. Above codes and no 5 volt refernce from VCM to TPS or MAP. At times it had 1-2 volts on 5 volt reference wire. This truck had a Dealer install a VCM and no fix- they said it spiked all the sensors and needed them all replaced. Sounded l... Trouble codes: P0122, P1122 (tps), P1406
2000 Chevrolet Blazer LS 4.3L convertor VIN: 1GNDT13W2Y
Vehicle came in with a strong shudder on engagement and disengagement of torque converter. no codes set. fluid clean. replaced torque converter, tcc solenoid, and filter& gasket. Customer returned days later saying that now the converter shudder is fixed but...
2000 Chevrolet Impala 3.4L odometer/shift indicator display VIN: 2G1WF52E2Y
On this vehicle the digital display for the odometer and shift indicator is very dim, and very difficult to see in daylight hours. There is no change with the dimmer switch or daytime running lights being active. There is a tsb about the operation of daytime r...
2000 Chevrolet Malibu 3.1L a/c control head VIN: 1G1ND52J9Y
Fellow Techs, A/C control head goes from recirculate to normal on its own. Occasionally, it will shut air compressor off when it does this. Car can be sitting still or moving, no difference. A/C system cools normally and pressures look good.
2003 Chevrolet Cavalier 2.2L windshield wipers VIN: 1G1JC52F23
Hello, problem is when the left turn signal is applied the wipers come on sometimes they pulse only once and other times they run as long as the left turn signal is on. I have replaced the pulse board inside the wiper motor and added a redundant ground it did ...
2005 Chevrolet Silverado 3500 6.0L abs VIN: 1GBJC34U34
customer complaint of pedal going to floor on application whith light load in truck (below 1 000 pounds. abs light came on. we could not duplicate the problem and checked base brakes. all in order, slight pulsation from front rotors. replaced brake master and ...
1995 GMC Yukon 5.7L abs VIN: 1GKEE13K4S
this yukon has a soft pedal. i have replaced master cyl. booster, abs control valving assembly. it has been bled several times, i am talking about over a gallon of fluid! i can dead head master cyl. and the pedal is rock hard. its was pressure and manually ble...
2003 GMC Yukon Denali XL 6.0L ride control VIN: 1GKFK66U33
customer claims he had a vibration in the seat at about 118kmh. The vibration existed with customers exisiting tires, the new 22" tires as well as a test set of P265/70R16 from another vehicle. We have balanced and road force balanced the 22" wheels. The unive...
1985 Oldsmobile Cutlass Salon 5.0L Hard Start VIN: 1985OLDSCU
This a show car so it is not driven much. Earlier this year the customer was having trouble keeping the car running. After diag we suggested eliminating the Computer Controlled Carb... We replaceed carb and dist and the car ran great "better than new" the cust...
1994 Pontiac Bonneville SE 3.8L Air flow VIN: 1G2HZ52L1R
Hey fellas, this one has very low air flow from the vents only. the defrost and floor vents seem to work good. The evap is clean and doesn't seem to have any blockage. The foam seals around the vent outlets look o.k. I think it is a problem within the air box....
2004 Pontiac Grand Am SE1 3.4L all VIN: 1G2NF52E54
Thanks in advance to all. I replaced transmission due to the owner running it out of fluid. I replaced with a trans that had 10k miles on it. Hooked everything up and am getting 4 dtc's all from the tranny like its not hooked up. I checked the connector pins a...

Fixes & Summaries for GM
Fix/Summary Answers
1989 Chevrolet G20 Chevy Van 5.7L fuel circuit VIN: 1GCEG25K2K
Hey guys! I appreciate the rapid response(especially Ted [...],who responded with the right answer in less than 45 minutes. I knew that I had read somewhere that these throttle body cars got their secondary fuel pump signal through the oil pressure sending un...
1996 Chevrolet S10 2.2L Misfire VIN: 1GCCS1440T
I finally figured it out. Cleaned out the spark plug recess, kept monitoring the recess (hot and cold engine) for fluid pooling, it is coolant seeping out from under the outer head bolt that is near #3, running down and pooling up. Since this is my own vehicl...
1997 Chevrolet Venture 3.4L Hesitation, Misfire, Trim VIN: 1GNDX06E3V
Well this sucker is fixed. After the update post, I tried some known good parts. I did not scope the primary, but installed a known good ignition module to no effect. Next, installed a new upstream O2 sensor and to my surprise the cruise Trim came down to a...
1998 Chevrolet K1500 Cheyenne 5.7L Misfire VIN: 2GCEK19R4W
Hi guys and gals, this one is fixed and thank you for your replies.Bob,Josh,Michael,chet,Larry,Richard,and Steve [...].We puchased a carbon cleaner from chevy. dealer and vehicle works like a charm.Richard you might try cleaner on your vehicle. Trouble codes: P0300 (random misfire), P0304 (Misfire cyl 4).
2002 Chevrolet Impala LS 3.8L low tire warning VIN: 2G1WH55K72
hey thanks to all that responded IATN is still the best tool in the shop! Turns out that the general was right on this one with a low tire I was able to keep the car in my shop for the entire week and on friday the rt ft tire had lost 5psi over the other 3. Th...
2002 Chevrolet Avalanche 1500 5.3L speedometer VIN: 3GNEK13T32
Thanks for the three replies I got. After checking further I found that I had voltage on the load side of the BRAKE fuse in the I/P. This is a brown wire, circuit 441 and it supplies voltage to the EBCM and to the stoplamp switch.I also saw that Exact voltage ...
2007 Chevrolet Corvette 6.0L vibration VIN: 1G1YY36U67
The high speed vibration was a tire, but we knew that. The low speed shudder is intermiant and the local dealer has given me the classic NPF both times I have taken it in. We are convinced that it is from the tranny, but can't duplicate it enough to nail it d...
1998 Pontiac Grand Am SE 3.1L shift interlock VIN: 1G2NE52M7W
Thank you for all your suggestions. After several hours, found that the A/C compressor clutch was drawing too many amps intermittently. Replaced assembly and draw returned to specs. Thanks again for your suggestions.
1995 Saturn SL1 1.9L Stall, no tach at times VIN: 1G8ZG5289S
Thank you to everyone who replied. Matthew from NC...your a lifesaver!! I pulled the white wire (ckt 121) out of the tan connector (pinK) at the back of the IP cluster and the problem disappeared. For the price of a new cluster, customer decided he can live ... Trouble codes: 19 (Ignition control 6x signal fault), 83 (low coolant switch open).
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