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Prev Professional Automotive Repair Technical Discussions for January 26, 2012
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Open Help Requests for GM
Help Request Answers
2001 Buick LeSabre Limited 3.8L Surge, Stall, hunting VIN: 1G4HR54K91
Totally stumped! cust brought vehicle in for no start, when it arrived at our shop I hopped in and it fired right away. test drove and it surged/hunted unless under heavy load. there are/were no codes present however it was surging and hunting. if I was tappin...
2004 Cadillac SRX 4.6L Warning Light VIN: 1GYEE63A44
There is a warning light that comes on ONLY when the vehilce is driven. Service vehicle soon light comes on in the radio which is a non emission related malfunction. The 1st scan we noticed a ABS fault in history CO241. Cleared fault and it does not come back....
1989 Chevrolet S10 2.5L No Start, Hesitation, Cuts out, Stall VIN: 1GCBS14E6K
the car intermitantly has trouble starting cold. can restart all day after the first start. next morning will sometimes die out. when it starts, once you put a load on the engine or hit the gas it dies. once the car has been running for aprox 2 min it runs fin...
1997 Chevrolet K1500 Cheyenne 5.7L Hard start VIN: 2GCEK19R8V
This vehicle will barely crank over after heat soak. When it does start to crank it often cranks way to long until it starts. Always starts perfect when cold. Its worst when turned off for a few minutes. We are leaning toward fuel pressure regulator but not su...
2001 Chevrolet Blazer LS 4.3L MIL Lamp on VIN: 1GNDT13W41
Help !!! this is driving me crazy the 171 code will set within 5 min, after two trips it will turn light on every time.even after clearing codes the ltft % will still be at +25 % but the avg will be at 0 is this normal for a snap on modis? tried to disconnect ... Trouble codes: P0171
2001 Chevrolet S10 4.3L MIL Lamp on VIN: 1GCDT19W11
customer wants a inspection,it has a code p0418.circut a relay on secondary air pump.ok we had volts at the fuse ign e , but no volts to the relay,85 we fixed broke wire in harnes, we ran another wire,so key on or running, we have volts now to relay. 3... Trouble codes: P0418
2004 Chevrolet Tahoe LS 5.3L No Start VIN: 1GNEC13ZX4
The FCP measures alcohol content is 38% and the scanned value is 43. Spec is 45 to 145 for content. Fuel trim observed cold and during warm up is -17 on LT and -1 to -3 on ST. No start occurs only below 50 degrees, when warmer after over night sit will start, ... Trouble codes: P0178 (FCP sensor value low)
2004 Chevrolet Silverado 2500 HD 6.6L Trany codes and now engine wont turn VIN: 1GCHK23174
Thanks in advance for your help. We have a Chevy Durmax with an Allison trany that came in for transmission service (routine maintanence). Our tech did the service and took it for a test drive. Shortly the check engine light came on and felt like it was stuck ...
2007 Chevrolet Suburban 1500 Z71 5.3L fueling vehicle VIN: 3GNFK16337
customer came in with check engine light on. and also said that she can only put about .50 cents of gas in tank at a time. pulled codes and got p0446 evap emission system vent control circuit. and p0496 evap emission system high purge flow. i have never had a ...
2007 Chevrolet Tahoe LTZ 5.3L No Start, MIL Lamp on VIN: 1GNFK13047
Group I had this tahoe towed in with a start then dies problem. Scan showed 6 codes so I erased to see what showed up when retrying to start. Gets a hard p0641 for the reference voltage. I looked on alldata and followed the tree and while in the engine area I ... Trouble codes: P0641
2000 GMC Yukon XL 1500 SLE 5.3L cluster VIN: 3GKFK16T4Y
Greetings to all the instrumant cluster at times when going over bumps will stop to work.speedometer goes up and down battery light comes on air bag light comes on gas gauge stops working the gear selector goes blank and i believe customer says cruise control ...
2005 GMC Sierra 1500 SLE 5.3L Torque converter VIN: 2GTEK13T75
Truck has an intermittent shudder when torque converter engages. Another shop replaced fluid and filter(not flushed)two months/5000 miles ago. They filled with five quarts Dexron VI. The shudder did not start until recently.On a twelve mile test drive yesterda...
2006 GMC C4500 Topkick C4E042 6.6L abs? VIN: 1GDE4E3266
Thank you for reading,well first off i dont have access to HEAVY DUTY MITCHELL or any sort of diagnostics or diagrams for this gmc 4500 topkick, with a 6.6 duramax. the abs module continuosly sets c0272 thru my GM Tech2, C0272 description thru tech2 is( base b...
1999 Oldsmobile Alero GL 2.4L Poor Idle Quality, Surge, Stall, Misfire VIN: 1G3NL52T5X
Vehicle Starts But Does Not Idle Had Codes For Crank Sensor, Map Sensor, Idle To High/ to low

Fixes & Summaries for GM
Fix/Summary Answers
1991 Chevrolet Camaro Z28 5.0L No Start VIN: 1G1FP33F9M
This vehicle is fixed. The problem was the injectors. We had initially done an ohm test on all of them and they were all within spec.After numerous testing of all parts of the system we went back to the injectors. We pulled the fuel rail and connected it to my...
1996 Chevrolet Astro 4.3L Misfire VIN: 1GNDM19W1T
Many thanks to all who replied. First I must acknowledge that the mileage I posted was a few miles short of the actual odometer reading. The correct mileage is 174,732. We replaced the distributor. Given the amount of cam retard, the distributor had to be turn... Trouble codes: P0300 (Random misfire detected).
1998 Chevrolet C1500 Cheyenne 5.0L Poor Idle Quality, Misfire VIN: 2GCEC19M2W
Well thank you all for the quick responses!!! I have fix it. Hoping it was not a mechanical engine problem, decided to try a new injection unit, and pulled the upper plenum off and there stairing at me was the problem. The injector lines for cyl. 1 and 3 we... Trouble codes: P0300.
2004 Chevrolet Tahoe LS 5.3L 4 wheel drive VIN: 1GNEK13Z14
OK first thanks for all the help this board is great. I took a long shot and replaced the encoder unit on the transfer case and it fixed the truck , all the lights on the switch now work and i can see the controller in the scanner , I would have bet the hous...
2006 Chevrolet Silverado 2500 HD LT 6.6L Misfire VIN: 1GCHK23DX6
Thank you everyone for your help. This request was only for a referral to a shop in my area that specializes in duramax diesel engines, as I stated in the description we do not work on these. We did find a local shop to take the truck, my friend has been dea...
2008 Chevrolet Express 2500 4.8L Theft Deterrent VIN: 1GCGG25C68
The votes were 4 yes and 2 no but the no's have it. The TDM had to be programmed with a Tech 2. I had the dealer do it and the truck is done. Thanks for all the replies. Jim
2008 Chevrolet Equinox LT 3.4L noise VIN: 2CNDL43F38
we disconnected the sway bar links and noise was gone we replaced bushings and links Thanks to all Scott
2008 Chevrolet Silverado 1500 WT 5.3L transmission VIN: 1GCEK190X8
Replaced Vehicle Speed sensor in tail shaft housing and so far no further problems reported by customer. thanks to everyone for there help and suggestions.
2000 GMC Jimmy Diamond Edition 4.3L transfecase motor VIN: 1GKDT13W8Y
After rechecking all connections and also manually moving the tc case to verify all gears still work (even with truck running and in gear the gears could be manually changed )The customer wanted the truck back ,I think it had something to do with the pcm becau...
2006 GMC Sierra 1500 SLE 4.8L Block Heater VIN: 1GTEK19V36
Thanks to all those who responded.I was looking for something to try that would not take too long. I ended up using a can of compressed air.It is used to clean computers,keyboards,etc. You can get it at a computer store.Hold the can UPSIDE DOWN and spray it at...
2008 GMC Canyon WT 2.9L dash lights VIN: 1GTCS19988
Need to update some info on this vehicle, it is fixed, the problem was the rear park light fuse to left rear lights was blown due to an aftermarket rear trailer harness shorting out and hooked into that wiring park circuit. The dash bulbs customer said were in...
2008 GMC Acadia SLT 3.6L radio VIN: 1GKER237X8
well we replece the ignition switch, costumer took the car and so far so good thanks to all for your help.
2006 Hummer H2 6.0L Hesitation, Misfire, MIL Lamp on VIN: 5GRGN23U66
Thank you all very much for the assistance in repairing this Hummer . Checked fuel trim and bank 1 was at 26 and bank 2 at -3 so i removed the injectors to flush and noticed that the bank 1 injector's was full of rust ?mostly in #3 and 7. Cleaned injectors ... Trouble codes: P0300 (Misfire).
2002 Oldsmobile Intrigue GX 3.5L c0040 VIN: 1G3WH52H92
After replacing Front Left Hub, the Right Front Speed Senor kept checking bad, replaced Right Front Hub, no more codes... Thanks To All...
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