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Prev Professional Automotive Repair Technical Discussions for March 23, 2009
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Open Help Requests for GM
Help Request Answers
1994 Cadillac DeVille 4.9L Surge, MIL Lamp on VIN: 1G6KD52B0R
code 41 will not reset and the service engine service soon light stays lit. any help would be great Trouble codes: P0041, P0053
1994 Cadillac DeVille 4.9L No Start VIN: 1G6KD52B4R
no start when its cold. fuel pressure is ok, i got injector pulse good. spark is ok. to start we have to advance the distribuitor. no codes. new timing chain replaced. new ingnition module, pick up coil. i have check the timing base, it is correct.
2002 Cadillac DeVille DHS 4.6L tcc siloniod VIN: 1G6KE57Y12
customer came in saying ses light would come on then go out after awhile. Now stays on all the time. scaned for code, p0741 came up.Doesn't seem to have any driveablity problem, and drives alot further before ses light comes on after changing filters, fluid, a...
1984 Chevrolet C10 Suburban Silverado 5.7L not sure VIN: 1G8EC16L9E
Ok, I didn't find out until the customer came to pick up the vehicle that what my "service manager" had wrote up as "check thumping noise in front end", has been a problem he has been chasing for awhile that was refered from another shop after they balanced th...
1997 Chevrolet K3500 Cheyenne 5.7L very high idle VIN: 1GCHK33F6V
engine rpm @ 2800 rpm. smoke tested - okay. throttle plate closed. scanned for codes - no codes. swap iac, and pcm - no change. tried unplugging other sensors,no change. iac reads .o counts. unplug tps- still high, also has 5 vol ref. has 4.8v ref sweep(wot). ...
1998 Chevrolet Cavalier 2.2L dash lights VIN: 1G1JC5242W
hello fellow techs, need some help on this one. car came in with all the dash lights on check engine, theft, low coolant, oil light, abs, park brake drl light flashes. vehicle has extended crank and seems like it is flooded but will start and run fine. cust h...
2001 Chevrolet Impala 3.4L No Start VIN: 2G1WF55E81
i have no prior repair history since this is a used car wouldlike to know if anyone has ahad this problem and if it can be related to passlock system security light is not on
2002 Chevrolet Corvette Z06 5.7L temp VIN: 1G1YY12S52
hi guyz thanx in advance.i have 02 drividility issue.sitting still temp goes to 230 comes on and than auge goes back to normal in middle which is 220 deg.when driving gauge stays at 220 and do not go up.come stop minute later see the gauge s...
2002 Chevrolet Venture LS 3.4L top end VIN: 1GNDX03E82
This motor has an intermittent slight ticking noise at idle and certain intermediate rpm ranges coming from top end.From ice cold start, no ticking usually.After slight warm up but not full temp, tick may appear.I have heard similar ticking on 3.1, 3.4 and3.8s...
2002 Chevrolet Impala 3.8L Battery/Alternator VIN: 2G1WF55K72
Hi All! Any help would be greatly appreciated, thanks in advance. Vehicle was towed in approx. 2 months ago with dead battery. Tested battery with "Snap On MicroVat". Failed. Replaced and ran complete system test (batt, alt and starter) Alternator failed. Repl...
2004 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDS13S14
Thanks in advance. Car came in last week with p410 code. Was able to command pump on and watch O2 mv drop below 75. It didn't stay below 75mv long the diag info didn't say how long it should. There was no water in the lines and the air sol opened and closed an... Trouble codes: P0410
2004 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 1G1JC12F44
Have all standard test for evap leaks.Looking for some G.M. exsperience as to known weak parts.(tank sensor,solenoids etc.. Thanks guys Trouble codes: P442
2004 Chevrolet Silverado 2500 HD 6.6L driver side heat VIN: 1GCHK29254
customer complains that driver side will quit putting out heat. passenger side works fine. this has dual climate controls. replaced heat/ac control module still same problem. checked wiring TSB and it seems to be ok. have the mastertech but can't seem to get i...
2006 Chevrolet Silverado 2500 HD LS 6.6L torque converter
this truck came into the shop with a complaint of will not move if you try to climb a hill from a dead stop. verified customer complaint. if you try to climb anything more than a 5% incline from a stop, the truck will not move, and will not rev past 800 rpm, w...
1995 Oldsmobile Silhouette 3.8L TCC Code VIN: 1GHDU06LXS
GM Trans Experts: This van with a 4T60E came in for electrical diagnosis because the problem will go away imediately after an ignition switch cycle. Symptom is it starts out in 3rd gear. MIL is on and a P0740 TCC is set along with an occasional P1630 System V...
2000 Saturn LS2 3.0L speedometer VIN: 1G8JW52RXY
Hello Fellow Techs, A two part question if I may please. I am working on a 2000 saturn LS2. The speedo does not work at all. I do get accurate vehicle speed readings on the scanner through the PCM. Also, I can do a gauge sweep through the BCM and all gauges s...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Riviera 3.8L Poor Idle Quality, MIL Lamp on VIN: 1G4GD2217S
i would like to thank everybody for their help. i borrowed a smoke machine,the vacuum leak was between the intake and the supercharger.those smoke machines are worth every penny Trouble codes: 171 (fuel trim lean).
1999 Buick Century Custom 3.1L Poor Idle Quality VIN: 2G4WS52M4X
Thank you to the people that offered replys. My customer has not returned to let me try some of the things suggested by you people. I had a lot of people ask about the coolant tempature sensor. This can't be the problem because I'm unable to adjust the idle us...
2002 Buick Rendezvous CX 3.4L check engine light VIN: 3G5DB03E72
Customer has been driving vehicle for over 2 weeks with no check engine light on and no known drivability issues. I appreciate all suggestions and everything everyone said was either already done or checked but unfortunately none fixed the problem. Transmissio...
2003 Buick LeSabre Custom 3.8L Cuts out, Stall VIN: 1G4HP52K23
replace transmission.need valvebody and overhaul and torque converter Trouble codes: P1811, U1040.
2006 Buick Terraza CX 3.9L Rt slider door VIN: 4GLDV13146
thank you for responses. we removed the access panel at the rt rear and exposed the module for the rt slider door. we had discussed the problem with identifix also and checked power and ground. noted the add on module for the Braun controls. it had connectors...
1979 Chevrolet Monte Carlo 5.0L pinon VIN: 1Z37H9B425
thanks for all the repiles i took it apart it was a pitted pinon and the pinon barings are shot ps i am takeing a spelling class i do fix car better then i spell---mike s
1994 Chevrolet Astro CL 4.3L No Start, ecm1 shorted VIN: 1GNDM19ZXR
Thank You To All who Replied, Alex [...]. You were Close when you said the injector wiring near the throttle body. The wire loom that runs over the Bank 2 Valve Cover had rubbed through and the Smallest wire Chafe i've ever seen was grounding out on the Middle Val...
2002 Chevrolet Monte Carlo SS 3.8L security light VIN: 2G1WX15K22
Thanks to all who replied this Monte is fixed. I replaced the ignition switch and key and cylinder w/ passlock sensor. I appreciate all your help. Trouble codes: B1440 (Power mode mismatch), B2958 (Passlock), B2964 (Key in Ignition).
2003 GMC Envoy SLE 4.2L radio VIN: 1GKDT13563
It seem that i have a hard radio to get unlocked. Ive tryed the the codes you can get off ebay but it does not work. They say because my radio is a RDS radio it can only be turned back on by a tech 2 or the dealer
2005 GMC Yukon Denali 6.0L rear overhead dvd VIN: 1GKEK63U45
There dvd/tv unit was sent back to the rebuilder for repair, there was not a program procedure for the region setting. Thank you for the replies.
2000 Pontiac Bonneville SE 3.8L Poor Fuel Economy VIN: 1G2HX54K8Y
Finally got the chance to fix this car. First repaired the exhaust leak. Then apon further inspection I found the fitting for the vaccum hose to the brake booster had a crack in it. The customer has drove the car for little more than a week and said the mileag... Trouble codes: P1602 (Loss of electronic brake traction control module serial data), P1626 (Vehicle theft deterrent fuel enable signal lost), P1811 (Maximum adapt and long shift).
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