GM Automotive Technicians Technical Discussion and Fixes for Jun 21, 2006

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Open Help Requests for GM

	Help Request	Answers
	1997 Buick Skylark Limited 2.4L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1G4NJ52T3V Okay. I need help. This car was brought in on the hook. Customer stated that he had ben on open highway for about 10 minutes, slowed down to 45mph to pass through a neihboring town and when he went to accelerate back up to speed the car started to shake violen... Trouble codes: P0300 (multiple misfire detected)	View
	1996 Cadillac DeVille 4.6L a/c compressor VIN: 1G6KD52YXT a/c compressor cycles when vehicle is in motion. A/C COMPRESSOR WORKS NORMAL WHEN SITTING STILL IN GEAR AND ALSO WHEN RPM'S ARE RAISED.	View
	1997 Cadillac Catera 3.0L ride control VIN: W06VR52R8V This is for all of you cadillac experts. This is a 97 Catera with a rear end that goes up intermittently. No codes that we can find other than Red Brick says it has undefined communications code. The car can be driven for 3 or 4 days with no problems then all ...	View
	1990 Chevrolet Corsica LT 3.1L temperature VIN: 1G1LT54T1L This car will not cool to very cold. (see related repair history) Thought compressor was bad again, a reman, so we put on a NEW Delco(V5)same problem, not that cold. The evap was flushed, no debris. The problem is with the outside temp above 90 degrees and the...	View
	1995 Chevrolet Tahoe LS 5.7L Excessive Emissions, Poor Fuel Economy VIN: 1GNEK13K5S cust complains of poor fuel milage. No runability problems. If engine is snap throttled from idle in park black smoke from exaust, but not during driving or accel. Sorry no smog numbers ,our smog scope is down. Scan data indecates long term fuel trim at 130-14...	View
	1996 Chevrolet C1500 Cheyenne 5.7L a/c control pannel VIN: 2GCEC19R8T I keeps shorting out the a/c control unit. I've used my power probe and acuated all the door acuator(blend door, tempeture door, front mode door) they all seem to work correctly. We've also replaced a few of the control pannels because they keep shorting out. ...	View
	1997 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1WL52MOV This Lumina has an intermittent problem where the 15amp PCM IGN fuse in the right side underhood fuse box blows. When the fuse blows it sets trouble codes for the Mass airflow frequency being low and the purge solenoid fault. When this fuse blows it loses the ...	View
	1997 Chevrolet Cavalier LS 2.2L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G1JF5243V This car is over fueling. It is loading up so bad that it will miss at idle. The o-2 stays at .9 most of the time untill the short term get to about -34%. Then it tries to switch rich- lean. This car has no test port for fuel presure test. I thought it was lea... Trouble codes: P0172, P0300	View
	1998 Chevrolet S10 2.2L exhaust glows red VIN: 1GCC51945W the injector pulse width never drops below 4.6ms. normal? had computer reflashed. Replaced o2 sensor they are going from lean to rich normally. replace map sensor checked for vacume leaks plugs are burning great exhaust leaks were repaired and theres no exhaus...	View
	1998 Chevrolet Blazer 4.3L Unknown VIN: 1GDRTYUW7W Greetings to all GM gurus out there... Got a easy one for you. Car comes in with complaint of no AC. Hook up guages and can visually see the compressor locking up. I replace the compressor, drier and orifice tube and flush syste... Charge system and have great...	View
	2001 Chevrolet Impala LS 3.8L No Start VIN: 2G1WH55K31 Greetings GM wizards. This vehicle came to us after being at a GM dealer where it had the plugged converter replaced. When it arrived at our shop it was seeping coolant at the intake manifold/throttle body area and when we removed the throttle body we found th...	View
	2001 Chevrolet Silverado 1500 4.8L ABS applies VIN: 2GCEC19V01 i have this chev truck that when stopping applies the ABS when stopping and the pedal falls to floor we changed the speed sensor in the trans because the rear sensor was reading like 5 miles per hour faster then the front sensors were and both the front were r...	View
	2003 Chevrolet Silverado 2500 6.0L Hesitation, Cuts out, MIL Lamp on VIN: 1GCHK23U43 Well everybody this is my first post and i want to say thanks in advance. This is one for the GM folks, I'm working on one of my first throttle by wire systems and have multiple codes p1516, p1518, p2108... all are for the TAC module. Which is the throttle act... Trouble codes: P1516, P1518, P2108	View
	1985 GMC C1500 5.0L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1GETC14H4F This vehicle was towed in due to blown head gaskets. Did the usuall repairs, replaced head gaskets and had heads completely rebuilt. Also had the carb rebuilt as well, twice in fact. The problem is the vehicle is running extremely rich hot or cold. Had the ori...	View
	1987 Oldsmobile Cutlass Ciera Brougham 2.5L Engine VIN: 2G3AM51R1H Car towed in, died while driving on the highway. Pulled the valve cover and found no valves moving. It looks like either a broken timing chain or a sheared key. I was wondering if this is common on these engines[2.5L] and if the pistons can hit the valves when...	View
	1989 Oldsmobile Delta 88 Royale 3.8L Front pads VIN: 1G3HY54C5R Hello group, I have a vehicle here with rapidly wearing front pads, the owner recently aquired this vehicle, has low mileage and seems to be in good shape. Brought in a few thousand miles ago, needing brakes. Virtually all wearable items expect the rear drums ...	View
	1997 Pontiac Firebird Formula 5.7L No Start VIN: 2G2FV22P3V this pontiac has a mind of its own it will start sometimes and some days it wont. It came to us this way and we diagonsed the problem to the weak fuel pump we drove the car and we felt this car was done. Well the customer drives the car and this is why Iam ask...	View
	1999 Pontiac Sunfire SE 2.2L charging system VIN: 1G2JB5249X vechile came in with the battery light on not a problem put an alternator in it charging system test was fine light out vechile left shop came back two days later with DRL light, charging system light, high beam light always on and hard starting. so once again...	View
	2000 Pontiac Bonneville SSEi 3.8L abs VIN: 1G2HZ5410Y Greetings to all this pontiac at times will have the abs light,traction light ,and red brake light come on at times.I have road tested this car monitoring all my speed sensors and all is well.I did retrieve a code c1214 for open coil circiut.I got the light co...	View
	2000 Pontiac Firebird Formula 5.7L clutch pressure plate VIN: 2G2FV22G2Y Car came in for new clutch, trans rebuild due to no 6th gear and regear the rear axle. All fine except clutch won't release. I've bled it 4 times with various techniques, no luck. Gravity bled, full pump and open bleeder, 1 inch travel, open bleeder and push t...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1996 Cadillac DeVille 4.6L No Start VIN: 1G6KD52YXT Hi: This one is fixed. Several techs suggested I install a injector cleaner cannister to the fuel rail with just gas and set it to system pressure and see how it started. It worked great. Even though we had what appeared to be good pressure and volume the pump...	14
	1998 Cadillac DeVille d'Elegance 4.6L compressor VIN: 1G6KE54Y1W sorry i should have added that i did flush all lines and no blockage was evedint however most of you were right the compressor was a reman and was faulty replaced compressor again and all is well thanks all charlie	6
	1990 Chevrolet Corvette 5.7L electric antenna VIN: 1G1YY238XI The fender nut that holds the top of the mast is round, and therefore no tool fits it, I finally grabbed it with some pliers and unscrewed it, and accomplished the install of the new mast assy, as it was described by the guys who replied. I just wonder where t...	3
	1994 Chevrolet C1500 Cheyenne 6.5L MIL Lamp on VIN: 2GTEC19S4R Thanks fopr the respones, two were not to worry about the resister, one said the resister pack can be removed with a pick or snap ring pliers. Yes there is a resister pack in the module, normally the new module does not come with it. They are numbered 1-9 this... Trouble codes: 35 (pulse injection error).	4
	1995 Chevrolet Blazer 4.3L No Start, Stall VIN: 1GNDT13W5S This vehicle finally wont't start at all. The fuse was ok, but fuel pressure was at 35 psi. The fuel pump didn't sound all that good anyways. I definitely suspected fuel pump. I replaced fuel pump and pressure was now in specs. High amperage draw from the fuel...	8
	1996 Chevrolet Monte Carlo Z34 3.4L timing belt VIN: 2G1WX12XXT I found that one of the cam pulleys was wobbling when the engine was runing, I replaced it and everything was fine. thanks for all the help.	14
	1998 Chevrolet K1500 Cheyenne 5.7L Poor Idle Quality, MIL Lamp on VIN: 2GCEK19R9W Thank you all for the info. most replies were dist. cap or valve spring problems. Afew said internal vacuum leaks and that got. Plugged off all crankcase ventilation and put vac gage in dipstick hole and saw instant vacuum. Pull intake gasket had shifted or bo... Trouble codes: 300 (misfire).	15
	1997 Pontiac Grand Prix SE 3.8L shift lock, ignition switch VIN: 1G2WJ52K0V Most replies suggested a sticky shifter. I took the console out and checked out the solenoid, and all seemed good. After sitting for the weekend I actually had this thing act up long enough for me to test the wiring. Turned out I had a power supply problem to ...	25
	2000 Pontiac Bonneville SE 3.8L Window VIN: 1G2HX54K2Y Thanks for all the help, most replies said to check the tan/ white wire in the door jamb. All wires in dooe jamb were good. After studying the wirng diagram, the signal from the drivers switches to the windows and door locks go down that single wire. Started t...	4
	1999 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZK5275X The customer has declined further diagnosis at this time. I did receive several replies stating to check the air pump itself more closely, especially for signs of internal comtamination. Someone even explained one way to test the motor for a dead spot. If the ... Trouble codes: P0410 (secondary air injection system).	7
	2002 Saturn SL2 1.9L alarm system VIN: 1G8ZJ52752 thank you for the help, a contact at saturn gave us a tip the rear door switches have issues, visually they will check out, if you rock the door hard with the alarm set, the problem will show. the right rear door switch was found and replaced	3

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