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Prev Professional Automotive Repair Technical Discussions for June 28, 2010
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Open Help Requests for GM
Help Request Answers
1997 Buick LeSabre Custom 3.8L Proportioning Valve VIN: 14HRS2K6VH
Brake lines are leaking on this one and I am at wits end trying to find brake proportioning valves for it. GM has on backorder for a few weeks allready and I have not been able to find any listings either looking myself or from calling the parts stores. Anyone...
1990 Cadillac Brougham 5.0L Compressor VIN: 1G6DW54Y1L
Cadillac experts, please help. This cadillac has had a carbureted 454 chevy +th400 swap. Done to it.the wiring harness has been cut out of the eng compt.the cust wants a/c to work again.i am wondering the best way to wire a basic relay for compressor operation...
1992 Cadillac DeVille 4.9L Compressor Clutch VIN: 1G6CD53BXN
This vehicle came in with a failed compressor clutch about 2 months ago. We replaced the compressor, accumulator, and orifice tube, charged it up and everything worked great. Now we are on our 3rd compressor, the clutch keeps coming apart. this last time it on...
2003 Cadillac DeVille 4.6L Pw Pmirror Pl VIN: 1G6KD54403
I got this car from a collision shop about 2 weeks ago. They sent it here because nothing worked on the front drivers door. At that time we checked all fuses and connections going to door modules. Then everything started working again. Delivered car back to co...
1998 Chevrolet K1500 Suburban 5.7L No Start VIN: 1GKFK16R7W
Hey Fellow techs. I have a Suburban that intermittenly will not start. When it will not start I have no injector pulse. Turn key forward the security light goes out but will not start. There is no codes. I have replaced pass lock sensor and housing. Also repla...
1999 Chevrolet S10 4.3L Oil Pan VIN: 1GCCSI4X1X
A local part store wants me to replace the oil pump in one of their delivery trucks.mitchell says remove engine first,but has comments saying its not a problem to change in the the truck. Has anyone removed the pan without pulling the motor.we have no faith in...
2000 Chevrolet Blazer LS 4.3L Misfire VIN: 1GNCS13WOY
Vehicle was towed into our shop. Customer was told by another shop that it had # 6 misfire and needed a head gasket. Found # 2 and # 6 plug wires switched. FIXED NOOOO. The vehicle now has # 4 misfire from idle to approximately 1774 RPM's. Between 1774 RPM's a... Trouble codes: P0300 (Engine Misfire Detected)
2002 Chevrolet Trailblazer LS 4.2L LR Brake VIN: IGNDT13S62
Hi Guys, I am helping a friend with his brake problem on this TrailBlazer. Initially the Left Rear brake started to not completely release so he replaced the calipers, rotors, pads, hardware, and hoses. I told him that the system would gravity bleed when he h...
2002 Chevrolet Silverado 1500 5.3L Transfer Case VIN: 1GCEK19T42
Vehicle came in with no 4 wheel drive and service 4x4 light flashing.The 4x4 switch on the dash will not light up in any mode.The only time it lights is when key is cycled to start and just for a split second.Checked for codes and no communication to 4x4.All o...
2003 Chevrolet Silverado 3500 LT 6.6L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1GCJK33163
Truck came into shop with complaint of low power, missfire and smoke at idle. Performed injector cut out test. Cyl's 2&8 failed. Replaced #2 and # 8 injectors. (we were unaware of previous dealer repairs to same cylinders prior to performing initial cut out te...
2005 Chevrolet Silverado 2500 HD 6.6L Cooling System VIN: 1GTHK29225
This truck has some of the same symptoms that other post under Fix Data, the cooling system has excessive pressure, and it will blow out a gallon of antifreeze in a week of driving. The truck does not over heat; you can hear the radiator cap reliving quite reg...
2006 Chevrolet Malibu SS 3.9L Radiator VIN: 1G1ZW53126
I have Replaced Head Gaskets an Head Bolts OEM Parts,Heads were Sent To Machine Shop Pressure Tested Cleaned an Surfaced. New Thermostat, Water Pump, Cooling system was bled properly. Drive Belt Installed Corectly, Air Dams Seem to be in place.Radiator Fans wo...
1999 GMC Sonoma SL 2.2L MIL Lamp on VIN: 1GTCS1947Y
Group, ihave a 99 sonoma that i just replaced the pcm for a bad injector driver & now runs fine but has a code p1336 crank relearn not complete, have tried several times with the relearn procedure, but no luck, have tried to clear the code but will not clear e... Trouble codes: P1336 (Crankshaft variation relearn)
2002 GMC Envoy XL SLE 4.2L rear suspension VIN: 1GKBS13SX2
i have this 02 envoy. the customer is interested in replacing his air bags with coil springs due to a small leak in each airbag. i have performed this procedure many times on town cars., but never on anything else. i was wondering if anyone out there has and h...
2003 GMC W4500 Forward W4S042 6.0L MIL Lamp on VIN: 4KDB4B1U83
Vehicle came in with P0120 and P2135. Previously worked on by another shop and throttle body assm. replaced. I only found codes in system never could duplicate fault or see anything on scanner, voltmeter or scope. Warrantied T/B assm. through local dealer and ... Trouble codes: P2135, P1516, P0120
2005 GMC Sierra 1500 5.3L MIL Lamp on VIN: 2GTEK13T75
Vehicle has been to my shop on three occasions with MIL on and PO171 stored. Vehicle has no running problems. All of the data looks normal. Fuel trims always look in spec. Can not find any vacuum leaks. I can clear the codes and MIL will stay off for about a w... Trouble codes: P0171
2006 GMC Sierra 1500 SL 5.3L a/c VIN: 1GTEK19B86
Vehicle came in because freon was blowing out around the compressor seal. we drained the system and did a complete rechare. We than ran the truck with the guages still hooked up and all was well for a few minutes, untill the low side pressure spiked close to 2...
2006 GMC Canyon SL 2.8L Starting VIN: 1GTCS13616
Dear fellow techs. Thank you for your time.I have this truck that has intermitate security issues it has [...] and B2957 stored. Sometimes the security light is on solid but still runs other times it flashes and truck starts and dies. I tryed different ke...
1992 Oldsmobile 88 Royale 3.8L No Start, mil off VIN: 1G3HN53L6N
Hi every body, tihs olds 88 wastowed in 4 a no start.i started inspecting it the next am.it was ok. By lunch it would not start.when the car is cool it will start and run untill turned off.then it will not restart untill the next am.engine temp does not seem t...
2001 Pontiac Grand Am SE 2.4L directional VIN: 1G2NE12T91
directionals work intermittently,4 way flashers work intermittent. When directionals inop 4 ways work when activated.directionals will then work after 4 ways are activated. Clicking comes from 4 way switch. New flasher /switched installed,now directionals work...

Fixes & Summaries for GM
Fix/Summary Answers
1964 Chevrolet Corvette 5.4L Rear Wheel Bearing VIN: 40867S1001
Thank you all for the responses. As we disassembled the problem hub, we found out it was the one that had a new spindle. We had the tools and shims to do it. But the hub had the smallest shim in it already. So no shim on this one at all. It was a little tight ...
1988 Chevrolet C1500 Silverado 5.7L No Start VIN: 1GCDK14K8J
My thanks to everyone who offered help. The guys that suggested check grounds nailed it. I got the vehicle to start with a new ign. module, but it was back to where I started: Poor performance. I noted the vehicles negative battery had two leads, one to the e...
1993 Chevrolet Corvette 5.7L Stall VIN: 1G1YY23P4P
thanks for all the help i did ohm check all the injectors they checked out ok .the customer decided he didnt want to spend any more money on the car and was going to sell it as is so i never got a chance to check out the distribtor.
1996 Chevrolet K3500 Silverado 6.5L Unknown VIN: 1GCHK33F0T
Thanks for the replies. What we found was if we removed the power steering pump belt and drove the vehicle the problem went away, so we replaced the hydraulic power booster and problem solved.
1999 Chevrolet Tahoe 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1GNEK13RXX
Thanks everyone. Most of the fuel system tests were borderlined ok. Ordered an ACDelco distributor cap and rotor. Installed and it runs like a champ now.
2000 Chevrolet S10 4.3L cruise control cable VIN: IGNDT13W7Y
Thanks to all who replied. The cable is the newer type and does not slide toward the firewall like the old ones. There is a small fragile plastic clip the I pried up slightly with a small pick just enough to get it off. You don't have to take the clip off all...
2002 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHK23182
Thanks to all that replied. The crankshaft position sensor reluctor was loose and causing the poor signal waveform to the ECM and the FICM. Not a small job to repair! Trouble codes: P0374 (Timing reference high resolution).
1991 GMC C1500 Sierra 4.3L Control Head VIN: 1GTDC14Z4M
Thanks to thosed who responded to my request. Replacing control head did not cure the flashing temp arrows. Neither did following the specific clearing procedure. Replacing the temp and recirc servos DID make system fully functional. Customer refused to go...
1987 Pontiac Fiero Sport 2.5L Clutch VIN: 1G2PM11R9H
2002 Pontiac Grand Prix SE 3.1L No Start VIN: 1G2WK52J62
Thank you guys for taking the time to read my post and send help. I am sorry to say that I did not get the chance to fix this one. I was trying to help out a friend on the side, and she didn't understand that paying customers have to come first. She came an...
2001 Saturn L200 2.2L shift interlock solenoid VIN: 1G8JU52F11
After checking everything out, we replaced the bcm and all is well. Thanks for the help!
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