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Prev Professional Automotive Repair Technical Discussions for December 28, 2010
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Open Help Requests for GM
Help Request Answers
1979 Buick LeSabre 5.7L paint code
i have a customer looking for the body # plate . the G.M. service manual say's it is located on the upper horizontal surface of the shroud,can not find it not sure of what shroud the manual is talking about
1995 Chevrolet Blazer 4.3L Differential VIN: 1GNCS13W5S
We serviced/lubed/ck.fluids on a 1995 chev.blazer.the service was done in oct.2010 @ 229,239 miles. The car was towed to our shop on 12/27/2010 @ 232,239 miles.the drain plug was not in differential.the differential had no fluid in it.my tech said he knowed wi...
1995 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Misfire VIN: 1GNCS18W3S
ok been a while since i did emmision diagnosis. this blazer came to us failing provincial emmision test. on idle it fails on hc an co: results are listed but limits are 200 for hc and 1.00 for co. fails on cruise portion too, hc limit is 54 nox limit is 595 an...
1999 Chevrolet Malibu 3.1L Surge, Misfire VIN: 1GDC1XTJ1Y
So I started to assist one of my coworkers with this car after he had replaced the intake manifold gaskets and the upper plenum (gaskets were leaking coolant, plenum cracked). This is a 1999 3.1L Malibu, and this surge when returning to idle was present before...
2000 Chevrolet Malibu 3.1L No Start VIN: 1G1NE52J4Y
Greetings to all this malibu was towed in last week for a crank no start checked real quick had spark and fuel pressure.the following day we tried to start car and sure enough car started checked for codes and only found po300 cylinder misfire.we checked the p... Trouble codes: P0300
2001 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1WCJ52J0
initially the customer brought in the car with the cooling fans always running while car was on. after tracing all wiring and checking relays and the like we found that the PCM was creating the always on condition. We ordered another PCM from the local parts s... Trouble codes: P0650
2001 Chevrolet Silverado 2500 LT 6.0L convertor VIN: 1GCGK29U9Y
this truck has bad vibration/chatter that shakes whole truck that only happens after lock up and under slight load. it just comes in and then goes right out if you let off gas or accelerate hard. if you hold gas steady it will continue to vibrate and if you ti...
2002 Chevrolet Monte Carlo LS 3.4L Radio VIN: 2G1WW12E82
Hi Guys, Ive got a good one! Vehicle came in with "highbeam out" message on the dash yet the lighting on the car works perfectly. Diagneostics brought me to a bad BCM. Replaced BCM and reprogrammed with Tech 2 and fixed the problem. Customer picked up car and ...
2003 Chevrolet Silverado 1500 5.3L t-case VIN: 1GCEK19T73
replaced transfercase last week with a jasper and the new one had no 4wd high did have 4wd auto checked with the scanner and found no output speed test wires and found that the case was missing parts replaced with a new jasper and now have my output speed but ...
2006 GMC Sierra 2500 HD SLT 6.6L No Start, Poor Idle Quality, Stall, MIL Lamp on
I am thinking there are bad wires in the harness. I checked the connectors for computer and they are all making good contact. Trouble codes: P0090
2000 Oldsmobile Silhouette GL 3.4L Heater VIN: 1GHDX03E9Y
This van came in for lack of airflow from the heater. When in vent position and the fan on high you can feel some air if you hold your hand in front of the vent but thats it. The problem is only when temp is set to hot, airflow is pretty good when set on cold....
2005 Other GM business cla .0L adjusters
2005 freightliner buisness class with air ABS brakes. The truck came in with the rear shoes completely worn into the drums. Replaced shoes, hardware, one speed sensor (due to broken wire) and drums adjusted slack adjusters and sent truck out. Truck came back i...
1980 Pontiac Firebird Formula 4.9L Turbo VIN: 2W87TAN139
Hello and thanks for any help any hotrodders out there can give me. Am trying to reassemble the engine and turbo into this car after someone else did the teardown and i need help with the oil lines that feed the turbo. Any help with pictures or discription of ...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Chevrolet K2500 Suburban 7.4L Front Axle VIN: 3GNGK26J0T
Thanks for all the replies and the one that really helped was checking the wire harness. Last summer the vehicle had a blown head gasket and another shop did the work. The wire harness that was close to the right head laid down on the back of the motor and bur...
2000 Chevrolet Silverado 1500 4.3L No Start VIN: 1GCEC14W4Y
thanks to all who replied, esp mark [...] who provided clarifying info and good stuff for future problems. as suggested i tried ign mod, unplugged maf and cam sensor, even subbed known good maf, reverified +&- to pcm cranking, tried new ckp s...
2004 Chevrolet S10 LS 4.3L MIL Lamp on VIN: 1GCDT13X74
After re checking all readings several times to be sure, I finally concluded the O2 sensors had to high of amp draw when cold in the first 2 seconds of use. We did replace them using factory O2 sensors and found a substancial drop in initial amperage draw. To ... Trouble codes: P0135 (HO2 Sensor heater performance bank 1 sensor 1), P0141 (HO2 Sensor heater performance bank 1 sensor 2), P0155 (HO2 Sensor heater performance bank 2 sensor 1).
2004 Chevrolet Tahoe LS 5.3L Unknown VIN: 1GNEK13T74
thanks to all that replied first we checked the front dif fluid it was black so we changed it it had a little metal on the magnet also changed both wheel bearings sofar no noise ill be the fist one to hear about it its my wifes truck thanks agian jeff
2004 GMC Yukon XL 1500 Denali 6.0L Accesseries VIN: 3GKFK16T84
vehicle never came back yet, for draw goes away with wiper fuse pulled out. so costumer taking their time due to holidays. will post if wiper motor fixes problem or not. thanks for the help.
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