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Prev Professional Automotive Repair Technical Discussions for January 20, 2012
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Open Help Requests for GM
Help Request Answers
1990 Chevrolet K1500 Cheyenne 5.7L Mechanical VIN: 1GCDK14K4L
Vehicle barely stops it takes a lot of foot pressure for braking. It's like there's no power assist. Good vacuum at booster. I saw a post about incorrect wheel cylinders, i checked them and there are the right ones. What am i missing
2000 Chevrolet Blazer LS 4.3L 4WD operation VIN: 1GNDT13W0Y
Blazer came in for no 4WD operation. TCCM module, in RF kick panel, had water damage to both mod. and connector. could not communicate with mod. Selector switch(2hi,4hi,4low), no auto, had 2hi illuminated all the time, no matter what button was pushed. Sold TC...
2004 Chevrolet Colorado LS 3.5L Rack & pinion VIN: 1GCCS19654
Truck came in for hard steering. Found u-joint siezed on steering shaft and leak at steering rack bellows area. Replaced steering shaft & rack. Used GM parts. Approx. 3 months later truck is back with hard steering. Replaced p/s pump with aftermarket pump. Tru...
2004 Chevrolet Silverado 3500 6.6L Surge, Misfire
This truck has had an on going issue. The engine will surge while cruising between 1600-2000RPM. It can occur very intermittently but with lower ambient temperatures lately (-30*C) it seems to be more noticeable. While the issue appears to be a surge it is ac... Trouble codes: P0303 (Cylinder 3 misfire detected)
2006 Chevrolet Aveo LS 1.6L MIL Lamp on VIN: KL1TD56646
Greetings: Vehicle came into our used car lot with a check engine light on. P0420 in system. It also had a few air bag codes. Reseating a connector and clearing the codes made the air bag light go away. Usually I can monitor the rear O2 to see if it is mirr... Trouble codes: P0420
2006 Chevrolet Colorado LT 2.8L Temp Gauge VIN: 1GCCS14806
Temperature gauge is a little over halfway. Never over heats. Could be cluster or sensor . Seems like a frequent problem on these models. Customer just bought the car waanted to know if it was normal or if it was a lazy gauge . Any issues concerning this probl...
2004 GMC C5500 Topkick C5C042 6.6L Shifting VIN: 1GDE5C1174
This wrecker was brought to our shop after the company that owns it burned up the "lectra shift" solenoid and wiring on the PTO by jumping 24volts directly to the pto solenoid. They claim that the truck had no transmission issues prior to this event. Now withi...
2006 GMC Envoy SLT 4.2L wipers VIN: 1GKDT13S26
customer complaint is that wipers and washer will come on by themselves while driving. when you turn on the wipers the washer comes on with it. i checked wires from what i can see everything looks ok. i was thinking it may be a problem with the wiper motor ...
2006 GMC Sierra 1500 SLE 4.8L Block Heater VIN: 1GTEK19V36
This truck has a thermostat type switch in the end of the engine block heater cord. I think it will only flow current below -18 C. Is there any way to test it other than waiting for it to get cold enough?
2007 GMC Sierra 2500 HD Classic SL 6.6L defaults to neutral
Hi everyone Thank you all in advance for any input you may have. According to the Vin this truck is 2007 but the emission label states 2006, just FYI. This truck came in with the listed codes, along with P0826 Up and Down shift switch circuit, and P0827 Up and...
2008 GMC Savana 1500 5.3L No Start, MIL Lamp on VIN: 1GTFH15468
Thank you for looking.. I'm looking for more info on testing this van. Has no fuel pump power . Mitchel is a little odd when it comes to the relay. We tried grounding pin 16and powering pin 47,at FPCM. pump dident run.(from direct hit). Tried buypassing the re... Trouble codes: U0109 (loss of fuel control module)
1999 Saturn SC2 1.9L Misfire VIN: 1G8ZR1270X
check engine light on. scaned and has a po300- multiple cyl. misfire. under load cyl. #1&4 misfire. if you unplug the egr valve the misfire goes away. intake is not leaking' replaced ign. coils,module,wires,and plugs with oem pts. tried a new egr valve also. n... Trouble codes: P0300

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Park Avenue 3.8L intake exploded VIN: 1G4CW52K8V
After removing what was left of the upper intake,I pressurized the fuel rail and found 4 of the 6 injectors leaking fuel.This along with a junk battery that allowed the engine to kick back during cranking is what set off the explosion.The responses where great...
1994 Chevrolet C1500 4.3L Clutch throwout bearing
Hello everyone, I followed through with my parts representative from O'Reilly and they gave me the third clutch kit replacement; however, in addition to this I ordered the clutch throw-out bearing directly from the local Chevrolet dealership (this way I cover...
1999 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1WL52M1X
hey guys thank you all.After replacing the knock sensor and checking the circuit for tons of times and replacing the ecm , i researched ALLDATA info and at the end if diag tree it mention to check my crank and cam signal which could create a p0327, so i did an... Trouble codes: P0327.
2002 Chevrolet Silverado 2500 6.0L ABS system VIN: 1GCHK24U02
Well my suspicions about the tone ring turned out to be true. I got a better view of the tone ring and as we slowly turned the driveshaft we could see some good teeth and some smeared and heavily dinged up teeth. Removed the drain plug from the transfer case a...
2005 Chevrolet Trailblazer LS 4.2L oil light VIN: 1GNDT13S15
Thanks to all for your help. I`m sorroy that i did`nt make it clear that we did press the gas pedal three times to clear the light. That`s what i ment when i said we cleared the change oil soon light. But the oil can with the wrench next to it stays on for lon...
2009 Chevrolet Malibu LT 2.4L Electronic VIN: 1G1ZJ57B29
Thanks for the replies. We referred the customer to the dealer. Problem was very intermittent and I did not want to start throwing parts at it to try and fix it. Thanks again.
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