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Prev Professional Automotive Repair Technical Discussions for January 24, 2012
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Open Help Requests for GM
Help Request Answers
1996 Buick Park Avenue 3.8L air distribution, errant temps VIN: 1G4CW52K0T
When going uphill, the air output drops from the dash registers to the floor, and returns on letup or decelleration. Also, with the dual zone system set on manual, and target temp set at 90, the passenger's side set at it's coolest setting, the passenger's sid...
2002 Buick Rendezvous CX 3.4L whole truck VIN: 3G5DA03E32
I hope someone has run into this one before. This truck (SUV) has a very annoying vibration ( like engine is resting on frame)at idle in or out of gear. It can be felt throughout the whole vehicle. The engine does not seem to have excessive vibration when plac...
2000 Cadillac DeVille DHS 4.6L Dash/cluster/HVAC display VIN: 1G6KE57Y3Y
I do have communication with DIM,IPM AND IPC. Data shows good on dim & ipm but on ipc scan data shows no data on all values. This thing is eating my lunch. Any or all advise greatly apearicated... (-:
2003 Cadillac CTS 3.2L Timing Belt VIN: 1G6DM57N03
Have this Opel powered Caddy that needs a water pump & Timing belt. Can this job be done without the aid of the crank positioning tool?(K/M J42069-10) I have universal cam holding tools, but nothing that even looks like this. Are the marks on the sprockets pre...
1977 Chevrolet Caprice Classic 5.0L th200 trans VIN: 1N47U7C172
Hi Guys This trans came in needing a rebuild. 5.0L, th200 trans. I have been told the th200 can not stand up to the 5.0L engine. It has the 2 barrel carb. The guy wants to keep it all original. I want to know, will that trans will shell with that motor stock?...
1991 Chevrolet Camaro Z28 5.0L No Start VIN: 1G1FP33F9M
vehicle will not start without adding fuel to system[carb cleaner] engine will start and run normally until you restart engine.compression 150 all cylinders/fuel pressure 41-45 on cranking/has good spark[new distributer and coil new plugs and wires.road test r...
1996 Chevrolet Astro 4.3L Misfire VIN: 1GNDM19W1T
Vehicle has a mifire mostly when cold. It happens under acceleration, goes away at speeds over 30 mph when in top gear. Once engine warms up, a very slight miss occasionally, but is almost completley gone. Symptoms seemed to match those for a bad injector asss... Trouble codes: P0300 (Random misfire detected)
2001 Chevrolet Express 3500 5.7L No Start VIN: 1GCHG35R61
When the vehicle first came in it would idle but had a heavy misfire under acceleration. MIL kicked a P0335 code. We had been burned by one before so we started by adding washers to the crank sensor. When that didn't work we watched the scanner and reference w... Trouble codes: P0335
2004 Chevrolet Tahoe LS 5.3L 4 wheel drive VIN: 1GNEK13Z14
Ok I have seen moat of the things that go wrong with the controls for the 4 wheel drive on these, but this is different. I have no 4 wheel drive , all the lights on the switch are out , i can get no codes out of the system but the dash is telling me i need to ...
2004 Chevrolet Astro 4.3L No Start, Poor Idle Quality, Hesitation, Cuts out, Misfire VIN: 1GCDM19X04
Cust states vehicle will not start. Had at dealership in another state and was told they needed an engine due to excessive crankshaft endplay. Dealer stated it had.110 end play. Vehicle was towed to us. Vehicle starts and runs fine. No codes. Has 65lbs of fuel...
2006 Chevrolet Malibu LT 2.2L No Start VIN: 1G1ZT51F76
have this 06 malibu here the customer has tried to fix and gave up. have scanned all modules and found no indication of a VTD problem. however it acts like a VTD problem. it will run on carb spray, has spark, has compression, has fuel, just no inj pulse. is i... Trouble codes: P0463 (fuel level sensor ckt)
2008 Chevrolet Silverado 1500 WT 5.3L Cruise Control System VIN: 2GCEK19J88
Greetings! Looking for some direction on this - Alldata is a bit scant on detailed information. System is inop - indicator on Cruise Control on/off switch does light up when turned on. Scan tool reads all switch buttons are working properly. For lack of any ot...
2004 GMC Sierra 1500 SLE 5.3L drain VIN: 1GTEK14T54
Vehicle came in with a drain on the battery. With the truck off, when the positive is pulled away from the battery and then reconnected there is a buzzing noise in the area of the instrument cluster as if it is powering up. Is this normal? Or could this be whe...
2007 GMC Acadia SLT 3.6L Passenger door and Heated seat VIN: 1GKEV33757
Hello have a intermittent problem with passenger door. The passenger side power window, door lock, mirror and passenger side seat heater will all stop working. The seat heater switch is located in the center console so I do not know why it would stop working a...
2008 GMC Canyon WT 2.9L dash lights VIN: 1GTCS19988
The dash light intemrmittently are inop. The codes were erased and only b2622 returned at this time. The lights are now working. We removed the bcm, checked ciruit board for corrosion as we noted some problems on this model were due to corrosion as per identif...
2008 GMC Acadia SLT 3.6L radio VIN: 1GKER237X8
hi i hope all of you haveing a good year so far,we working on 08 GMC arcadia,the truck has fw problems some times the radio coms on wt everyting off,and the other problem sometimes it wont tunr off get the key out and still running, i wonder if eny one seen th...
2006 Pontiac Montana SV6 3.5L abs sensor VIN: 1GMDX33LX6
have this awd .set code for rf speed sensor malfunction.and awd disengaged.my question is why does the abs still work?anytime i see a abs fault the abs is disabled.i am not formilable with this car so i am puzzelled.also needs rear wiper motor ,i dont think th...
2002 Saturn SL2 1.9L noise VIN: 1G8ZK52712
Good morning! i have a 2002 saturn sl2 here, customer requested drain and refill on transmission. Had no issues before this. I drained and refilled transmission and replaced spin on filter. Test drove vehicle and had no issues at all. Customer came back after ...

Fixes & Summaries for GM
Fix/Summary Answers
2002 Cadillac Eldorado ETC 4.6L Cuts out VIN: 1G6EC12962
Thank you for all the replies on this one. We had suggested to customer monthes ago to replace both crank sensors and he did not want to open his wallet at that time. After seeing all the replies from other technicians the customer was willing to put them in. ...
2007 Cadillac Escalade ESV 6.2L suspension VIN: 1GYFK66857
The fix for this vehicle was the electronic suspension control module. The High speed serial data circuits were open at the module. The diffaculty diagnosing this was the operation of my tech 2. The vcm in the tech 2 would not work on this truck but would on o...
2004 Chevrolet Tahoe LS 5.3L Pcm VIN: 1GNEK13T44
I want to thanks everyone for giving me the strategy for this truck. We only received it for the diagnosis the shop that sent it will do the missfire repair. Thanks again Seth
2005 Chevrolet Suburban 1500 LT 5.3L odometer VIN: 3GNEC16Z45
I am going on my instincts and some of yours,I am a former chevrolet tech and I will be shipping it,That is the way to go and that is what we did as chevrolet techs.Thanks for your input guys
2006 Chevrolet Express 2500 6.6L Poor Idle Quality, noise/vibration VIN: 1GCGG292X6
Didn't receive many replies on the theory of a failed turbo, that was a major clue. We looked elsewhere. This is what we found, the Duramax engine when mated to a 4L80E transmission instead of the Allison, there is an adapter flex plate to step down to the sma...
2007 Chevrolet Cobalt LS 2.2L MIL Lamp on VIN: 1G1AK15F97
2010 Chevrolet Equinox LT 2.4L Engine VIN: 2CNFLEEW3A
Thanks to all who replied. I tried most of the suggestions. I installed a cut-off valve before the high pressure injection pump, once closed the pressure dropped 20-30 psi within 3-5 mins and in 10 mins pressure stayed at 10 psi. Oil had strong odor of fuel bu...
1988 Oldsmobile Cutlass Calais 2.3L fuel injectors VIN: 1G3NF54D3J
Sorry for the delay, but this is a car that has been on the back burner for a long time, bottom line found rub through on crank position sensor wire and repaired, started right up and ran for 20-30 mins, died same problem. when cold it will start and run. Tri...
1994 Other GM HEAVY RESCUE 330CID Low fast idle
thank you to all whom replied. seems that we'll have to purchase prolink for our fleet of fire trucks. after this, maybe we can upgrade the rpm's. shame that dealers and reps don't even carry this stuff anymore. thank you to all again whom replied.
2003 Saturn Vue 3.0L canmshaft VIN: 5GZCZ53B23
Thanks everyone for your replies, all were helpful. Special thanks to Mathew from Tenn and Troy from Penn. The cams indeed did have A's and E's. Machine shop had used an etcher to put their own marks on the cams which happened to be right next to and on top o...
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