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Prev Professional Automotive Repair Technical Discussions for December 21, 2010
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Open Help Requests for GM
Help Request Answers
2004 Cadillac CTS 3.6L ebcm VIN: 0G6DM57704
Car came in with service stability sys and service brake assist going across information center. The traction off light was on. Scanned all computers. Engine drag control, traction control system, and vehicle stability enhancement systems all showed failed in ...
1994 Chevrolet C1500 5.7L Poor Idle Quality, Misfire VIN: 1GCEC14K2R
does not want to idle very good can unplug est wire runs better, check ac millivolts found in iatn, orignal dist 200 millivolts,got what oriellys says new same thing rechecked over [...] on inital crank steady at 480 millivolts,customer had new ingitio...
1994 Chevrolet Astro 4.3L Hesitation VIN: 1GNDM19W5R
Hi All Thanks for taking a minute to look at this post. It's eating my lunch and dinner. came in with a stumble or hesitation on accelration aroun 30 mph average to moderate accel. dose not die but acts like it holding back then sometimes it clears and it acc...
1997 Chevrolet Tahoe 5.7L high idle VIN: 3GNEK18R4G
Hello all, me again from martins. have a 97 tahoe with idle problem. after driving down highway and come to stop, truck wants to idle anywhere from 1200 to 1800 rpm. Watching modis Iac is commanded to around 46, and i know the counts should be around zero at i... Trouble codes: P0507
1998 Chevrolet P30 7.4L Poor Idle Quality VIN: 1GBMP37B9W
hello I have a 1998 chevy 7.4 fuel injected with allison 545 has a banks power pak headers and air filter no electronics modified. this is in a class A motor home. intermittent power loss. when driving i can step on the accelerator quickly to wot it performs w... Trouble codes: P0131, P0151
1999 Chevrolet Blazer 4.3L leak VIN: 1GNDT13W2X
leaking anti freeze and I can not tell where it is coming from even thou I see anti freeze dripping off the bell housing and small amounts around the intake manifold.I can not tell if its the intake manifold or hose coming back from the heater core inside that...
2000 Chevrolet K2500 LS 5.7L hard start VIN: 1GCGK24U3Y
customer came in about 1 year ago for same problem. at times in the morning it would take a couple of crank attemps to start the truck. after it started, who knows when it would do it again. i check fuel pressure and everything was ok. cleaned throttle body an...
2001 Chevrolet S10 4.3L Hesitation, Cuts out, Stall, MIL Lamp on VIN: 1GHK45SD34
I have another 250,000 mile S10 4.3 that is kicking my butt once again. The main complaint is that it will cut out and fall on it's face while driving mainly at highway speeds. It's a very intermittant problem. Happened to me once while I had a fuel pressure g... Trouble codes: P0300
2002 Chevrolet Silverado 1500 LS 5.3L Transfer Case VIN: 1GCEK19T62
Gentlemen (Ladies), We have got a problem that we can't seem to solve. This truck came to us stuck in 4-whl. dr. high. We replaced the encoder motor on the side of the transfer case & have also replaced the frt. diff. actuator. It's still stuck in 4-whl. high....
2003 Chevrolet Silverado 1500 4.8L ignition switch VIN: 1GCEC14V63
Hello Everyone.This truck came in intermittent no crank.when it did crank it would start.gear shift indicator would show to be in drive but it would be in park.we replaced module on the side of the transmission fixed that problem.now it won,t crank at any time...
2007 Chevrolet Monte Carlo LT 3.5L Radio, Blower VIN: 2G1WJ15K17
When driving this vehicle the radio volume will shut off. The ligts stay on the radio and you can turn the volume up and change radio stations but there is no music at all. As soon as you stop the car and turn the key off and back on the radio will work again ...
1995 Pontiac Trans Sport 3.1L Traction control VIN: 1GMDU06L8S
The TCS light comes on pretty much as soon as you move off going forwards, does not activate in reverse. No current or history codes in ABS module (None in eng' or trans' either), if there was an open or short then I would expect a "C111" or a "C136" for low v...

Fixes & Summaries for GM
Fix/Summary Answers
1955 Cadillac DeVille 5.4L Vacuum Booster
Well I want to thank everybody that responded to my call for help on this car. The brake system is 100% in good condition shoes and cylinders all serviced. Vacuum is good and throttle return spring has good tension. Customer obtained a rebuilt unit and that to...
1989 Chevrolet S10 2.5L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 1GCBS14E5K
The customer just returned with this vehicle today. That gave me some time to get advice and think about it. What I ended up doing today was removing the EGR valve and checking to see if it was stuck open from carbon. The valve looked good, but I cleaned it wh... Trouble codes: 33 (MAP Sensor Circuit Signal Voltage High).
1999 Chevrolet Monte Carlo LS 3.1L Abs VIN: 2G1WW12M6X
Thanks for all the replies guys...it ended up being a right front reluctor or toner ring had cracked from rust buildup. Replaced right front axleshaft w/ring-test drove-A-ok. Some 10 replies said sensor issues, but 3 guys nailed it with the cracked toner rin...
2000 Chevrolet Monte Carlo LS 3.4L No Start, MIL Lamp on VIN: 2G1WW12M1X
Several posts said BCM and or communication were the most likely. Correct on both counts. The BCM has powers and grounds. When it was disconnected some dash lights came on. Then reconnected and the car would start. It would run a while but still had no com w...
2002 Chevrolet Astro 4.3L trans case VIN: 1GNE19X72B
We replaced shift motor and sent transfer case out for rebuild. Cleaned all wiring connections, cleared codes and test drove. Vehicle operated as new. Thanks to all that read our post and took the time to respond. Gyle @Salt Spring Auto Service
2003 Chevrolet Trailblazer LS 4.2L Poor Idle Quality, Hesitation, Stall VIN: 1GNES16S53
Customer needed to take vehivle and never returned for further testing. We may never know the root cause of this malfunction but thank you all for your suggestions.
2004 Chevrolet Tahoe LT 5.3L Fuel Smell VIN: 1GNEK13T74
Thanks for all the replies. Most common response was fuel pump assy - evidently these can crack or have seal failure and no apparent leak, but a definite fuel smell. 2nd most common response had to do with evap system. Right now I'm leaning towards the evap sy...
2007 Chevrolet Silverado 1500 HD Classic LT 6.0L Poor Idle Quality, Surge VIN: 1GCHK23K77
OK, It was just the process of cleaning the throttle plate assembly and idle relearn that fixed this problem. We went through the motions and it runs perfectly. More often than not,the fix isn't as hard as finding good info and knowledge. Thanks for all your a... Trouble codes: P0507 (Idle Speed High).
2006 Pontiac G6 3.5L power steering VIN: 1G2ZG52865
Thanks for all the responses guys. I did contact the dealership and they did say it falls under the extended warranty claims, but only if it had certain things going wrong with it. They said they would have to check it out to make sure, but if it didnt fall un...
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