GM Automotive Technicians Technical Discussion and Fixes for Jun 15, 2006 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1998 Buick Park Avenue 3.8L sluggish VIN: 1G4CW52K2W This vehicle has a low power condition. It acts like the timing is either retarted or fixed. We have checked all sensors with Modus. No codes, has rough acceleration when pulling out. Will not rev high enough to make wot shifts	View
	1999 Buick Regal LS 3.8L shifter,inst. cluster/abs/mil lamp VIN: 2G4WB52K5X Hello, 1st time calling for help but,i have to say this site has truly amazed me, what a great info source. This buick came in for cutting off while driving,I did duplcate concern,note ABS light on, service engine light on, some times, p1602c code before repai...	View
	1999 Buick Regal LS 3.8L compressor clutch VIN: 2G4WB52K2X check engine light is on 1 code "evap pressure switch code" reset comes back on . tested comp clutch relay power on 2 of 4 terminals, no power to high side cycling switch, has no low side switch under hood. my question to gm techs is were is the evap pressure ...	View
	1995 Chevrolet Camaro Z28 5.7L cooling system VIN: 2G1FP22P3S hello techs, this vehicle came in overheating and loosing coolant. we diagnosed it as a water pump and did the repair. problem is now it still overheats. i think i have an airlock but i can't get it bled out. it has no heat from heater we have flushed it with ...	View
	1997 Chevrolet C1500 Cheyenne 5.7L radio VIN: 1GCEC19R3V hello group, we have a 1997 chevrolet c1500 pickup. finished replacing leaking intake manifold gaskets. started up engine, radio shows loc optained codes from radio 23 172 / amfm 176 gm dealer wants 85.00 to unlock and 3 days from today anbody who can help, ...	View
	1997 Chevrolet Tahoe LS 5.7L fuel gauge VIN: 1GNEK13R4V please help gm tecs! we have an irratic fuel gauge reading-replaced failed fuel pump- on test drive we noticed fuel gauge bounces back and forth. called customer and he stated it had been that way prior to the fuel pump failure. after performing wiring testing...	View
	2000 Chevrolet Impala LS 3.8L Cuts out, Stall VIN: 2G1WH55K1Y Good challange here. The customer has had this problem since fall of "04. Flickering MIL and the car will shut off. *NO scan data! It will not restart for 40-60 seconds. If you try to restart, it fails to enable starter relay erraticly, it backfires and tries ... Trouble codes: U1016 (in other modules--no communication to pcm)	View
	2004 Chevrolet Silverado 3500 6.6L No Start VIN: 1GCJC33184 Please help. I have a 2004 duramax that has a hard start after engine is warmed up. Fuel pressure will not reach of 38.6 mpa if commanded to by tech 2.	View
	1991 GMC K2500 Sierra SLE 5.7L Poor Idle Quality, Surge, Stall VIN: 1GTFK24K3M Truck will start and run fine until after it is warm. Then when you let it idle in park the rpm's slowly drop to about 500. I can watch the iac drop with it to about 10 counts. Then the idle will surge up a little and then die. It seems as if the computer is c...	View
	2000 GMC Sierra 1500 SL 5.3L Shift Feel VIN: 1GEK19T7YE This truck was brought in for a harsh shift. The first thing that struck me odd is that there were no codes. After verifying that the shifts were indeed harsh we monitered data coming into the computer as in mass air flow and tps and everything seemed in range...	View
	2001 GMC Savana 2500 5.0L Poor Idle Quality VIN: 1FTGG25M11 Hi guys got this GMC van here with these 2 codes I have never seen the P0507 code and I was wondering if anyone else has ever seen it and what do I need to do to repair the vehicle. The random misfire code I am suspecting that the vehicle needs plugs and wires... Trouble codes: P0507, P0300	View
	2002 GMC Envoy SLE 4.2L Poor Idle Quality, Cuts out, Stall VIN: 1GKDT13S52 Under most circumstances, truck runs perfectly. Occasionally, it will stumble, or stall completely, on the freeway (60 to 75 mph). Does not stumble at all around town. No codes in memory. We are 20 miles from the nearest interstate, and our mountain roads make...	View
	2000 Hummer H1 6.5L Ignition switch VIN: 137ZA8439X Hummer Limo was towed in with a blown 40 amp ignition fuse located in the power distribution box. When the ignition switch is turned on the fuse blows immediately. We can not get schematics for this vehicle so we traced the short to the igntion switch. The sho...	View
	1995 Oldsmobile Aurora 4.0L No Start VIN: 1G3GR62C75 HELP!! The anti-theft module turns the starter on and off while cranking. You just said "What?" didn't you. When holding the key in the crank position on this 4.0L V8, power to the small wire on the starter is comming on and off randomly. I checked power into ...	View
	1997 Pontiac Grand Prix SE 3.8L 1-2 shift VIN: 1G2WJ52K8V Hi everybody and thanks in advance for your help. We have a customer here with the ever since syndrome. We flushed their trans back in feb. and now we have they say we caused their trans to slip. Help needed! It slides into 2nd. Other gears are just fine. Tran...	View
	1999 Pontiac Grand Prix GTP 3.8L Hesitation, Surge, Stall, Misfire VIN: 1G2WR1212X one more for the gm tecs! this vehicle came in with a complaint of surging then stalling at stops- we duplicated a misfire hot only and found original tune parts and customer using cheap gas. did full tune with wires- ac/delco parts- motorvaced injectors and h...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1997 Buick Park Avenue 3.8L Poor Idle Quality, Stall VIN: 1G4CW52K8V hey guys, sorry for the delay had some computer troubles. We found the car to have a faulty upstream O2 sensor. Car has been gone since monday and talked to customer today and said it was running great. thanks for all of your help	20
	2000 Buick Park Avenue 3.8L theft deterrent VIN: 1G4CW52524 I am extremly thankful for the replies to my post. The replies indicated that first accessing the theft deterent module, then testing the inputs and outputs, would provide final diagnosis. Their was no real most likely problem, as previous repairs ranged from:...	6
	2002 Buick Century Custom 3.1L Hesitation, Surge VIN: 2G4WS52J02 Hi,Thanks to all who responded. I found that the converter was about one-half plugged up. I first unhooked the exhaust tube at the egr valve and started the engine, on acceleration there was a tremendous amount of exhaust comming out of the tube so I suspected...	8
	1994 Cadillac Eldorado 4.6L transmission VIN: 1G6EL12Y5R Hi everyone and thanks for all your great ideas. We installed the new PCM and everything seems to be doing great now that everything is reset. The SES light still does not come on for the bulb check but it does come on when you crank the car and when there is ...	6
	1992 Chevrolet K2500 Cheyenne 5.7L Excessive Emissions, Poor Idle Quality, Surge, Stall, Misfire, Poor Fuel Economy VIN: 2GCGK29K4N The problem with this vehicle was the fuel injectors. Spray did not look abnormal, even when shining a timing light on them. The biggest clue was that the plugs that were fed by one injector were darker than the other 4. Vehicle ran fine when fuel pressure was...	18
	1997 Chevrolet Lumina 3.1L Surge, Cuts out, Stall, Misfire VIN: 2G1WL52M5V got a lot of answers, but i think i am chasing a broken wire. thanks for all great advice. ignition sw,fuel pressure& volumn mass air flow ciol pak & mod. crank & cam sensors thanks again,will add to post when i find problem.	14
	1999 Chevrolet Express 2500 4.3L Hesitation, Stall, Misfire, MIL Lamp on VIN: 1GCFG25WZX Further diagnostics resulted in faulty PCM. PCM throwing cam retard from -8 to -10. Replaced PCM. No further problems reported by customer. CAM retard at 0 and remains at 0. Trouble codes: P0339, P0300.	7
	1999 Chevrolet C2500 Suburban 5.7L Power door locks VIN: 1GNGC26R6X I had one reply regarding replacement of the BCM, one reply indicating a bad rear cargo door switch could cause the problem, two replies telling me to perform voltage checks, and two replies regarding the actuators going bad. I had already performed all the vo...	6
	2000 Chevrolet Malibu 3.1L stearing VIN: 1G1ND52J8Y Ok,Thanks to all the responces to this problem i was having.I replaced the rack and stab links in one car and did the tsb and stab links in the other car and both are fixed.Thanks again	20
	2000 Chevrolet Express 3500 5.7L Hesitation, Cuts out, Stall, hard start thanks for the help guys.The pcm checked ok-no cracks, I did adjust the timing slightly but the main problem was the coolant temp. sensor was intermittantly reading way too cold. I was able to duplicate the concern today on a test drive and saw coolant temp at...	5
	2001 Chevrolet Blazer LS 4.3L abs module VIN: IGNDT13WXI Thanks to thoes that helped. The light is still om intermitently. The code co265 is still there. replaced with used abs mod, and used motor. Tried to test with Tech 1 and would not because of code. Cleared code and scanner turned it back on. Very hard code. No...	13
	2004 Chevrolet Express 3500 6.0L oil loss VIN: 1GBHG31U04 Thanks, for all the help. With the miles on this engine the customer has decided to replace it. It is a fleet delivery vehicle. The kind responses and our inspection took us to the rings.	4
	1999 Oldsmobile Alero GL 2.4L traction control VIN: 1G3NL52TXX checked tps already,sweeps fine at this time,only code stored,replaced tps	1
	2000 Pontiac Grand Prix GTP 3.8L unknown VIN: 1G2WR5217Y Thank you to everyone who replied. The last thing I tried was cutting the suspected circuit between the PCM and the 2-3 shift solenoid and putting in a jumper wire to eliminate if the wire was somehow making contact with something (I could not see any visiable...	3
	2002 Saturn SL 1.9L Hesitation, Surge, Misfire VIN: 1G8ZF52812 well thanks to all that responded to this problem, most responses centered around checking or replaceing ign. coils, aparently this engine uses the ign. coil pulses to determine cam position, {hence the cam position sensor code}although it has no sensor, deale...	6

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