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Prev Professional Automotive Repair Technical Discussions for December 2, 2009
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Open Help Requests for GM
Help Request Answers
1997 Buick Park Avenue Ultra 3.8L heater operation
i am leaning to the mode motor.occassionally i can change thr modes with the scanner but it takes a lot of switching on to off.any past frustration would be appreciated.thanks
1999 Buick Park Avenue Ultra 3.8L Electronic VIN: 1G4CU5214X
Hello everyone. Vehicle had cold air blowing on driver's side and hot on passenger side when calling for hot on both sides. Cold as in the A/C cold air was blowing. Consulted IATN and determined it was highly probable the blend door actuator was faulty. Tested...
2004 Buick Century Custom 3.1L pcm/ipc/bcm VIN: 2G4WS52J44
customer dropped off car- no speedometer, no coolant temp, gear indicator shows drive in park, no radio. car starts and runs fine with no cel. tried to scan for codes- no communication with pcm,bcm or ipc. checked fuses to modules for proper voltage. seem ok. ...
1992 Cadillac DeVille 4.9L Poor Idle Quality VIN: 1G6CT53B1N
hi techs got a super clean caddy true 50000 miles complaint of poor idle quality did complete tune up wires plugs etc still at idle runs rough once off idle it is fine no codes fuel pressure is good any ideas would be helpful thanks.
1997 Cadillac DeVille Concours 4.6L No Start, NO SPARK VIN: 1G6KF5496V
Someone please help with this headache. we just replaced this northstar with a used engine. We now have no spark at all. replaced moduals with known good ones, replaced both crank sensors, and ran a jumper harnes from ckp's and icm. Have triple checked all pow...
1994 Chevrolet Camaro Z28 5.7L No Start, HARD START VIN: 1GCEC19K4S
This car has done something I didn't think was possible. It intermittently loses injector pulse (on all injectors) BUT will still run. I had the engine running and was checking pulse one injector at a time with my noid light.Every injector connector didn't sho... Trouble codes: 18 (injector fault)
1997 Chevrolet Blazer 4.3L Poor Idle Quality, Hesitation, Surge, Cuts out, MIL Lamp on, Poor Shift Quality VIN: 1GNDT13W4V
Vehicle came in for a transmission problem. Shift quality was poor. Traced problem to the TPS where there is a TPS low voltage code. I am not get my 5v ref from the VCM. I checked all power and grounds to the computer and all are good. I got and re-flashed a r...
1998 Chevrolet P30 7.4L emergency brake VIN: 1GBLP37J5W
Help!!! I'm lost!!! I have zero knowledge or experience with this E brake system!! I do have a schematic off of Mitchell, although it has no wire colors. I know the switch on (under) the dash is good (power to and through it). I can apply power to the hydrauli...
2000 Chevrolet Silverado 1500 4.3L Stall VIN: 1GCEK14W4Y
truck starts fine for e sec. or two unplug maf no change , no data at aldl there is power at the orange wire at aldl fuel pressure is 60psi security ligh is on but not blinking try to do a relarn but it acts like it donīt need a relearn or i canīt tell if it n...
2002 Chevrolet Impala 3.8L converter? VIN: 2G1WH55K42
Hi there! I sure hope someone can help me. I have this Impala that came from auction and has a wicked noise. This thing has a VERY LOUD knocking or popping noise coming from the bell housing. The noise happens under load driving down the road or in the shop in...
2005 Chevrolet Express 3500 6.0L trac control & engine operation VIN: 1GAHG39U95
Customer complaint: "Vehicle doesn't want to accelerate after a stop. Motor still running but it just won't go" Under slow acceleration the "traction active" light comes on and the motor stumbles slightly and you can feel some type of abs activity in the accel...
2006 Chevrolet Cobalt LT 2.2L No Start VIN: 1G1AL55F36
We had this 2006 Cobalt Lt that worked fine before the battery went dead over time sitting at a used car dealer. Then the car would sometimes start, and sometimes not start. We have the car here, and have charged the battery fully, left ignition key on for 15 ...
2007 Chevrolet Impala LS 3.5L Starter VIN: 2G1WB58K67
Greetings GM guys and Gals. This one was towed in by customer. Said he had shut it off one night and the next morning it wouldn't crank. NO aftermarket auto-starts or other goodies attached. Thought it would be simple but it's eating my lunch at this point. St...
2008 Chevrolet Suburban 1500 LT 5.3L tpms,remote door locks VIN: 2GCEK19J08
tried to program receiver with tis, programming failed with error codes line 04 operation 53 error code 00, line 05 operation 53 error code 00. does anybody know what these errors are and what to do now?
2008 Chevrolet Colorado LT 3.7L Poor Idle Quality, Hesitation, Surge, Misfire, MIL Lamp on VIN: 1GBDS14E38
Hi guys got another problem child here! Ok we bought this truck with a blown motor so we got a motor from a local salvage yard. The motor came out of a 2007 year model which said it was supposed to work if you swap out the cam sensor. So we did all that and go... Trouble codes: P0014 (Camshaft position timing over advanced or system performance), P0366 (Camshaft position sensor B circuit rangeperformance), P0300 (Randommultiple cylinder misfire)
1998 GMC Jimmy SLE 4.3L No Start VIN: 1GKDT13W8W
First thank you to anyone who replies. I have seen this vehicle 3 times for a crank and no start. Everytime it is at the shop it starts perfectly. I have been able to retrieve one code but it is so intermitant that I am not able to run the diagnostic test prop... Trouble codes: B2958
2007 GMC Sierra 2500 HD SLT 6.6L Starter, VIN: 1GTHK29D77
vehicle started out internimtantly loosing power and stalling, and then when i got in my bay was check out wiggling wires got to pcm and stalled and hassnt restated yet, no codes have data and can control out puts through scanner bur wont start san jump starte...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Buick Riviera 3.8L air bag system VIN: 1G4GD2218T
Thanks for all your help! This one's fixed and down the road. Two replies stated that the load tool is basically a 2.7 ohm resistor. I wasn't able to locate one , but then I figured if it's supposed to be 2.7 ohms, why can't I disconnect SDM, of course aft...
1990 Chevrolet Corvette 5.7L ABS light on VIN: 1G1YY2381L
Thanks for all who responded. I went all little farther on module testing and found left front channel in module had 1.3m ohms resistance, other three channels read 480k ohms. Took forever to get a module, not availible new anymore. Just got used one, checked ...
1997 Chevrolet Malibu 2.4L Horn VIN: 1G1ND52T3V
Thanks to all that Replied. They headed me into the direction of a short to ground. I removed the plug at the horns. And installed a door buzzer in place(much quieter for the sake of shop mates). Then begun the long process of wiggle tests. Finally found the p...
1998 Chevrolet S10 4.3L No Start, Hesitation, Surge, Cuts out, Stall VIN: 1GCDT19X3W
well another one chalked up to victory, let me re-phrase that...another LEARNING experience. went through all my previous steps and started from scratch again. under load fuel pressure would fall to 40 psi and the engine would surge. ok...what would cause this...
1998 Chevrolet Tahoe 5.7L passlock VIN: 1GNEC13R7X
Yes, this year did not have a body computer, but does have an antitheft module that controls the security light etc. Yep this one needed a new antitheft module. I got one from the dealership, I plugged it in, turned the key on, and the security light blinked 4...
2001 Chevrolet Silverado 2500 HD 6.0L steering VIN: 1GCHK29U51
Thanks, Replaced pump that a friend of customer recently replaced. He left off rear support bracket. He did not install the bolts that hold reservoir to tank so there was the probable source of the leak. It looked like the return tube was leaking and it may h...
2003 Chevrolet Avalanche 1500 5.3L airbag light on VIN: 3GNEK13T33
after getting a new set of front impact sensors with no change i pulled the connector apart and put the wires on the the right impact sensor also no change. I then switched the two wires and bam the code was gone. we are not really sure how or when the wires w...
2006 Chevrolet Silverado 1500 LT 5.3L Poor Idle Quality, Misfire VIN: 2GCEK13T76
the truck still has a slight miss very seldomly, we did a motor vacc on it and reflashed the comp,we chose not pull the engine to far apart to look at cam/lifters at this time because it seems to be getting better with drive time. thanks all for your help hop... Trouble codes: P0300.
2006 Chevrolet Silverado 2500 HD LS 6.6L Brake Pedal VIN: 1GCHK29D46
first of all thanks for all the advice.special thanks to carl for getting my wheels to turn.THIS took narrowing the problem down by caping of lines to the abs unit .It was on the outlets that went to the front brake lines to the abs unit were the loss of brake...
1995 Pontiac Grand Am SE 2.3L overheat VIN: 1G2NE55D4S
Thank you to all who replied. This vehicle seems to be fixed. Many suggested the water pump and other said head gasket. I did test for head gasket leak and test was negative. Some replies said that the stat would only open if the heater core had flow so I took...
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