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Prev Professional Automotive Repair Technical Discussions for July 1, 2010
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Open Help Requests for GM
Help Request Answers
1999 Buick LeSabre Custom 3.8L Excessive Emissions, No Start, Poor Idle Quality, Cuts out, Stall, MIL Lamp on VIN: 1G4HP52K4X
Car was towed in with the complaint of customer was driving and went to make a turn and the car shut off on her. Customer also stated that the oil light and check engine light came on at that time. I went out to start it had to hold the gas pedal at about half... Trouble codes: P0172 (Fuel System too Rich Bank 1), P0101 (MAF Performance/Range)
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1994 Cadillac Fleetwood Brougham 5.7L No Start VIN: 1G6DW52P2R
Thanks in advance. we have this 1994 fleetwood brougham that was towed in. the opt spark dist had been taken out and no one marked the rotor position. Mitch and Alldata dose not tell me hot to set the timing, all they say is its none adjustable. do anyone have...
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1993 Chevrolet S10 EL 2.8L turnsignal VIN: 1GCCS19R8P
Need alittle help. All data does not give clear instuctions on removal of turnsignal stock and switch . This being my first on this older style column I am having trouble getting this apart . I have removed the wheel,turnsignal switch but need help with the st...
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2001 Chevrolet Silverado 2500 LS 6.0L wipers horn VIN: 1GCGC24U51
The wipers only work on high. The w/s squirters work but the wipers don't move when squirters are on. The wipers don't park in the down position either. Also the horn does not work. Fuse is good and the horn works on the bench. Thanks in advance, Dustin.
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2001 Chevrolet Silverado 1500 5.3L MIL Lamp on VIN: 2GCEK19T41
Intermittant code PO442. Sometimes doesn't come on for 3 days. Cleared and sometimes comes on in a few hours. I replaced the gas cap since it seamed to come on the first time after I filled it up. After I cleared the code the first time it didn't come on for 3... Trouble codes: P0442
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2001 Chevrolet Silverado 1500 LT 5.3L dash battery Light VIN: 2GCEK19T21
Help!! Good long time customer, came with intermittent battery light displayed on dash (volt meter shows 13V) when this happens. Had failure while in shop,with light on, per history responses in iatn disconnected conector from alternator dash light should go o...
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2003 Chevrolet Tahoe LT 5.3L rear auxillary a/c VIN: 1GNEK13Z33
Greetings techs. I am having a problem with the rear HVAC system in this Tahoe. At times you can't control the air temperature coming from the rear a/c unit. One year ago the mode door actuator and control module were replaced. It has worked properly until rec...
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2004 Chevrolet Silverado 1500 LT 5.3L evaporator VIN: 2GCEC13T74
a/c blows about 52 degrees at idle actually goes up to 56 at speed. not cold enough in this heat. all vents about the same temp. Checked about everything we could think of, did not find an answer. Has anybody seen this problem? thanks in advance for any help.
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2007 Chevrolet C5500 Kodiak C5C042 6.6L MIL Lamp on VIN: 1GBESC32X7
Ses lamp on all the time now, has po299 stored. Dealer said it may not be under warranty anymore, outside the 2 year warranty. We are not diesel techs but have great electrical experence. Is there any problems with map-turbo system that may arise from sitting/... Trouble codes: P0299 (Map/turbo)
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2007 Chevrolet Colorado LS 3.7L MIL Lamp on VIN: 1GCCS14917
Every few weeks the check engine light will illuminate in this vehicle with no driveability complaint. Each time we pull two codes: P0326 Knock Sensor Perf and P0171 Lean O2 Sensor and read 3 freeze frames. Two of the freeze frames are for Code P0171 and were ... Trouble codes: P0326 (Knock sensor performance), P0171 (Lean o2 sensor bank 1)
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2007 GMC Sierra 2500 HD Classic SL 6.0L Tire Monitor System VIN: 1GTHK29K07
This truck has manual window and locks. The tire monitor works through this system. The stock wheels have been replaced with none monitor wheels. Can i disable the tire monitor system so the light and info center message will not come up when started?
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2001 Pontiac Aztek 3.4L Cooling Fans Inop VIN: 3G7DB03E71
This is a friends car he just bought. Vehicle overheats the fans don't come on. The fans work when the AC is on and they will come on when commanded with the Tech 2 low and high. Replaced the PCM and no change. Replaced all 3 relays no change. I don't have the...
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Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Century Limited 3.1L Hesitation, Surge, Cuts out, Stall, Misfire VIN: 2G4WY52M7V
Godd morning. Much thanks too everyone that took time to reply. Marvin, Kelley, Randy and Bill you hit the nail on te head. This car too had the ckp wires melted and shorted to the rear exhaust manifold. Also thanks to Craig who told me that these engi es hav... Trouble codes: P0420.
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1990 Cadillac Brougham 5.0L Compressor VIN: 1G6DW54Y1L
THANKS ESPECIALLY TO KENT .WE USED A NPN TYPE TRANSISTOR INLINE WITH THE GREEN+YELLOW WIRE. CONTROL HEAD TO BASE,THE EMITTER WENT TO GROUND,THE END WITH DIODE HOOKS TO RELAY TO GROUND THE RELAY COIL.THE REST OF THE SYSTEM SO FAR SEEMS TO FUNCTION PROPERLY. TH...
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1989 Chevrolet Corvette 5.7L No Start VIN: 1G1YY2184K
Thanks for all the replys to my reguest for help. This is the first time I experienced injector problems that could cause a no start. The injector ohms ranged from 1.2 to 16 ohms. They were all different, this was the problem. Installing new injectors solved s...
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1995 Chevrolet Blazer 4.3L Electronic VIN: 1GNDT13WXS
Have returned truck to trans. shop, they think in valve body. Had also installed comp. same problem. Also had replaced ing. switch didn't help. Thanks for all the help
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1999 GMC Sonoma SL 2.2L MIL Lamp on VIN: 1GTCS1947Y
THANKS FOR THE REPLIES, I TRIED ALL SUGGESTIONS, BUT WAS UNSUCCESSFUL, TOOK VEHICLE TO DEALER FROM WHICH THE REPLACEMENT PCM WAS PURCHASED & THEY USED A TECH 2 & GOT IT TO RELEARN, I THINK THEY REPROGRAMMED THE PCM BECAUSE IT DIDNT GET DONE CORRECTLY THE FIRST... Trouble codes: P1336 (Crankshaft variation relearn).
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2004 GMC Envoy SLE 4.2L Poor Idle Quality, Reprogramming VIN: 1GKDS13S34
we were able to reprogramm the ecm. i was able to call GM at 1-[...] and talk to a real person. I gave him the codes and line details. the codes have to do with an aftermarket radio. thanks for the number to GM tech line. Trouble codes: E4491 (Reprogramming error), E4423 (Unknown reprogramming error).
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2002 Pontiac Grand Prix SE 3.8L air flow VIN: 1G2WP52K92
Sorry I dont have any good info for you. The blower motor is turning the correct direction. I pulled the blower motor and the resistor but no access to the evap core. It is on the driver side of the car. Could not find any debris in the system. Customer does n...
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2002 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZF52852
When the customer came back to further diag the problem, I removed the pcm and checked all inputs,power,ground...I activated the air pump with the scanner and did not get any signal directly out of the pcm to the relay. So,I gave the customer an estimate for t... Trouble codes: P0410 (Air management).
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