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Prev Professional Automotive Repair Technical Discussions for March 7, 2008
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Open Help Requests for GM
Help Request Answers
1993 Cadillac Fleetwood 5.7L No Start VIN: 1G6DW5276P
I have run out of ideas. This vehicle has a very extended crank when temperature is below about 35 degrees farenheit. I has spark and fuel and will eventually start. Has no codes in pcm but shows quad driver fault-yes, also noticed the Intake Air temp jumps ba...
1996 Chevrolet Tahoe LS 5.7L No Start VIN: 1GNEK13R5T
I have a hair puller. This 1996 Tahoe will not start when it is cold; around 40 degrees or less. It will crank fine, has good fuel pressure according to Mitchell, and fuel pressure holds good without leaking off. When it cranks it will try to start. It sounds ...
1999 Chevrolet Silverado 2500 6.0L Heater VIN: 1GCGK29U1X
Car came in loses heat intermittently.You will just be driving along and the heat just fades away to nothing , not even lukewarm.Will not come back even when RPM's are raised. Will not happen all the time. Replaced thermostat ,same problem occurs.Outlet heate...
2001 Chevrolet S10 4.3L #1 Spark Plug VIN: 1GCCS19W01
We are a Euro car repair shop but 1 of the guys has an ongoing problem with personal vehicle. He has replaced plugs several times, valve guides/valve job, oil consumption very high...intake full of carbon & oil ...would appear to be some type of PCV/ breather ...
2003 Chevrolet Trailblazer North Face 4.2L Hesitation, Cuts out, Stall, MIL Lamp on VIN: 1GNDT13S63
Vehicle came to us with very bad runability symtoms, started with basic maintanance ( filter, fi service ). Solved problem and ran great for 3 days, returned with check engine lite on 1345, cannot duplicate and crank signals good, no drop, vref ... Trouble codes: P1345
2005 Chevrolet Colorado Z85 2.8L Mechanical VIN: 1GCCS14815
Help please. I have a fleet truck here from Napa and have a reaccuring brake issue. The problem is every time you brake it wants to nose dive just on the front brakes. Brought it in and clean and adjust rear brake because they were barely touching and all is f...
2006 Chevrolet Silverado 3500 LT 6.6L Poor Fuel Economy VIN: 1GCJK33D96
we havent done any physical testin yet other than scanning or dtcs.the vehicle emits an odor that customer describes as ammonia like. when i drive it the smell is awful and will come through the heater vents, and is worse on the passenger side near the cat. if...
2006 Chevrolet Silverado 3500 LT 6.6L No Start VIN: 1GCJK33D86
I have a customer that just bought this 2006 K3500 6.6l duramax truck at an auction yesterday. It was sold "as is" because it won't start. He had it towed to my shop to have me get it running. I don't have any experience with the Duramax but I have worked on t... Trouble codes: P0336
2003 GMC Envoy SLT 4.2L alternator VIN: 1GKDT13S23
hello iatn world, thanks in advance! customer brought this in complaining of a louder than normal noise coming from the engine compartment. the only thing that sounded un-normal was the sound of the alternator working too hard. scaned for codes, found none. pc...
2000 Oldsmobile Silhouette GL 3.4L Surge VIN: 1GHDX13F3X
Help, GM techs! This vehicle is owned by a very good customer of ours. The 2 complaints, are Check Engine Light coming on (numerous times last year - most not documented) and jerking while driving down the road after a hot run, such as interstate driving then ... Trouble codes: P0131 (HO2 1-1 voltage too low), P0137 (HO2 1-2 voltage too low)
2000 Pontiac Sunfire SE 2.2L Radio VIN: 3G2JB124XY
We've got this Sunfire that came in for a battery going dead. Checked for draw, nothing significant - 70mA - not enough to kill it overnight. Noticed the radio was inop, fuse was pulled. Installed fuse and now radio display stays on even after exiting vehicle ...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Cadillac Seville STS 4.6L Transaxle input sensor VIN: 1G6KY5294P
Thanks to all that replied. After driving the car more and check the transaxle input sensor wave form at the pcm another code come up P029 shift solenoid 'B' which is also pretty common on these cadies. I pulled lower pan and saw the shift solenoid Broken I re...
1989 Chevrolet C1500 Cheyenne 4.3L Poor Idle Quality VIN: 1GCDC14Z1K
thanks to all that replied, all the info received was of great assistance but phillip hit this one. i know i checked the grounds at the timming control module earlier but may have bummed the harness and got a pretty good reading.however g107 at tstat had up t...
2000 Chevrolet Express 3500 5.7L stalls at high rpm VIN: 1GCHG39R8Y
Thanks to all who answered my cry for help. As time went on and the test drives continued, the fuel pressure started dropping down to 50 psi at 50 mph. It was a noisy ride with the engine cover off but many of you suggested I make sure the fuel pump could ke...
2004 Chevrolet Suburban 1500 LS 5.3L No Start VIN: 3GNFK16Z94
Thank you to all who replied. As I stated the customer picked up the vehicle. It is a flex fuel vehicle and this was only the second tank which had been used of E-85. After 200 miles the customer added regular fuel and the vehicle started to run and start bett...
2003 Hummer H2 6.0L RF Dash VIN: 5GRGN23U53
Thanks for all the information. I tried all the suggestions but could not locate the noise. The owner did not want to persue the noise any farther. If I get the vehicle back in and find the problem I will edit this fix. Thanks again.
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