GM Automotive Technicians Technical Discussion and Fixes for Dec 4, 2006 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1992 Cadillac Fleetwood 60 Special 4.9L Misfire VIN: 1G6CG53B7N This whole thing started with a MIL complaint,rich running,misfire. DTC for ECT ckt open. Replaced sensor,clear code,ship it. Returns in a week,same problem,same DTC plusE42 data comm error. Test everything and replace PCM. Runs good for 45 minutes, then rich...	View
	1988 Chevrolet C1500 Cheyenne 4.3L No Start VIN: 1GCDC14ZDJ I am disgusted with what should be a simple fix here. This truck recieved a terrible engine swap from a backyard hamburger flipper with too much ambition. It came in after it was done to straighten it out and I got it running really well by misc repairs. A wee...	View
	1994 Chevrolet K2500 Cheyenne 6.5L No Start, Cuts out, Stall VIN: 1GCFK29S4R I have a immaculate low milage 6.5 that started to died with immediate restart 3 months ago, now it has progresed to a daily event with no correlation to ambient, engine temp or load. now it can can take between 1 and 20 minutes before a the engine will start.... Trouble codes: 64 (mil circuit fault)	View
	1996 Chevrolet C1500 Suburban 5.7L tach & speedo VIN: 1GNFK16R9T the vehicle came in because the gauges and radio went haywire. The tach and speedo quit all togther but the tach sometimes works for a short while then quits the radio works then quits sometime if u tap on the dash it comes back but not always it makes no diff...	View
	1997 Chevrolet S10 LS 2.2L No Start VIN: 1GCCS1942V Good day GM Techs! I have a S10 pickup with a cranks, no start condition. Has good spark. No fuel pressure. When I hook up the fuel pump check connector, the pump runs and vehicle fires right up. OK, my question is, what does the ECU look at to determine if i... Trouble codes: P0121 (TP sensor or APP sensor 1 problem), P0172 (Fuel system too rich bank 1), P0300 (Random cyl misfire), P0530 (AC Refrg pressure sensor ckt)	View
	1998 Chevrolet Tahoe LS 5.7L Misfire, MIL Lamp on VIN: 1GNEK13R8W I have been messing with this one for about six months on and off. Vehicle runs great, no problems, until you hit a hill. As soon as you hit a hill it starts to miss and buck and SES light comes on with codes P0303, PO304, PO305. 3 of the injectors and tubes h... Trouble codes: P0303, P0304, P0305	View
	1999 Chevrolet K2500 Suburban 6.5L MIL Lamp on VIN: 3GNK26FXXG It's me again with this suburban. I put a injection pump on and I can not set the timing on the pump.The timing is 3.5 and it's 10.3 and it want set.It also set a code po251.I need to know what going with suv and what am I doing wrong. Trouble codes: P0251	View
	2001 Chevrolet Silverado 1500 5.3L Heater control VIN: 1GCEK14T41 Hot/cold heater control won't work when the truck is warmed up. This truck came in today, and while it was still cold I tested all 3 knobs to see how they worked. 1)Blower knob all five leavels were fine. 2)Blend temp knob Blew colder on the far left (blue) an...	View
	2001 Chevrolet Impala LS 3.8L lf abs sensor VIN: 2G1WH55K31 Hi All, I have this 2001 Impala with an intermittant ABS problem. Intermittantly, the ABS/Traction control message will pop up in the instrument cluster. Back in September, I replaced the left front hub/bearing/abs sensor as it tested bad--no voltage output--...	View
	2002 Chevrolet S10 LS 4.3L radiator VIN: 1GCDT13W62 The radiator hose on top shows 160 degress and the bottom radiator hose shows 90 degrees. The hose to the heater core both check out at the same temp. Thank goodness. My only question is, do you think there is any way it could be the water pump even though it ...	View
	2004 Chevrolet Tahoe LS 5.3L Battery Drain VIN: 1GNEK13Z74 Thanks for looking at my request, The customer says that the battery will go dead after sitting for 5 or 6 days but sometimes it will not go dead after sitting for 5 or 6 days. He also says that the check engine symbol and the brake light on the dash will ligh...	View
	2005 Chevrolet Impala LS 3.8L tire pressure monitor VIN: 2G1WH55K15 Tire pressure monitor trouble. This customer has had repeated settings of this code even though the tire pressures have been good. There are no ABS codes(this system uses the ABS sensors to determine a low tire). I could find no service bulletins that cover th...	View
	1997 GMC C1500 Sierra GT 4.3L p0446 VIN: 1GTEC14W2V a few weeks ago this veh. came to us with the ses lt. on, p0446, vent sol. was operational, cleared code, checked for leaks, none found. veh. came back, same code, commanded w/ scanner found blowing with mouth on port the plunger would hang up after commanding... Trouble codes: P0446 (evap canister vent blocked)	View
	2001 GMC Sierra 2500 HD SL 6.6L Surge VIN: 1GTHK29131 Problem is a severe surge or shutter in cruise only, with slight load or slowing down, truck will actually buck. no codes in engine or transmission, cleaned map sensor no change, unplugged map sensor no change, fuel pressure steady about 7000psi when acting up...	View
	1999 Pontiac Sunfire SE 2.2L brake strut spring VIN: 1G2JB5245X Hope someone can help me on this one. Have a 1999 Pontiac Sunfire with the "rear wheel lock up syndrome". Replacing the shoes (rivoted only!), drums and hardware/retaining kit. The problem I am having is with the brake strut spring, they were both rusted/broke...	View
	2000 Pontiac Grand Am GT 3.4L front suspention VIN: 1G2NW52E3Y thanks for any help offered in advance.vehicle came in last winter with a complaint of knock\raddle or chuckeling noise over light bumps,at slow speeds such at parking lot driveing.noise is only evedent when ambiant temp is below around 30 degrees when it is w...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2006 Buick Lucerne CX 3.8L alignment. VIN: 1G4HP572X6 thanks to all that replied.after lucerne was taken back to dealership 4 times they finally took it to alignment shop for correction.dealership has state of the art alignment rack but apparently no one knows how to use it.alignment shop that car was taken to is...	30
	1990 Cadillac DeVille 4.5L Stall VIN: 1G6CD5331L I did a major tune-up, plugs, wires, cap, rotor, pcv, fuel filter, air filter, cleaned throttle bore, checked timing. I replaced fuel pump relay. I relocated ground strap to starter bracket, as per TSB. Car has not stalled since, it has been a week. Hopefully ...	5
	1994 Chevrolet C60 Kodiak C6H042 6.6L cooling system VIN: 1GBJ6HIJ6R we replaced the thermostat again, and made sure belt is not slipping, head gaskets are still suspect, if they are leaking it is only under a heavy load. time will tell, heads will be comming off if this continues. thanks for the help	6
	2000 Chevrolet Astro 4.3L No Start, Hesitation, Surge, Cuts out VIN: 1GBDM19W4Y Thank you. Great Replies. All the Same. If you test drive the car/van/truck as one Tech said, if you watch the 02 it will flatline below 200 milivolts, it needs a pump. Sure enough, I went back in the next morning after posting this. I have a graphing scanner,...	8
	2001 Chevrolet S10 2.2L engine noise VIN: 1GCGS14571 i would like to thank all the members of iatn, this is a great tool in the sometimes nightmare auto reapair industry. it turns out that the camshaft itself was the problem. you could barely see the lobes, with the lifters out. we should have looked further, on...	6
	2003 Chevrolet Trailblazer North Face 4.2L Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 1GNDT13S73 Hi and thanks to all who contributed. The vehicle indeed had a plugged exhaust system as many of you suggested. Also needed an o2 sensor and software reflash. Customer was able to get the dealer to warranty repairs but was kind enough to call and confirm our d... Trouble codes: P0171, P0172, P1171 (fuel system lean during accel.), P0300.	12
	1999 GMC Safari SL 4.3L Hesitation, Surge, Stall, MIL Lamp on VIN: 1GKDM19WXX I first tried to reprogram ECM still with no luck to communicate with I-Flash programmer. Ordered Dealer ECM, programed and all is well. I get codes and data with scan tool. Also after replacing ECM you must go through procedure to sync cam and crank. Using sc...	9
	2003 Hummer H2 6.0L seat heaters VIN: 5GRGN23U03 most info sent mentioned software updates for drivers seat module. i feel that the problems start from this module. As this truck is under extended warrenty it has gone back to the dealer for repair. If and when any more info is avalible i will post THANK YOU	4
	2000 Oldsmobile Intrigue GL 3.5L themostat Well we fixed this one but we had to get inventive. What we found was the coolant temp after being run through heater core was too cold to allow the thermostat to open. This only happened at idle with the heater fan on high, off idle or the fan on any other sp...	16
	1994 Pontiac Bonneville SE 3.8L f.pump-windows VIN: 1G2HX52L2R this car not only had corrosion on wire cluster under carpet bot one lead broken,made some new wires of these to a new location yhat is a little bit better to get at and all is well..thanks for the help..	10
	2001 Pontiac Firebird 3.8L engine VIN: 2G2FS32K51 The big drip is gone, finally! Once again, thanks for all of your replies, all 23 of them. After adding dye and taking a long test drive to get it showing, we double checked everything we could see with the transmission in the car. The leak was definatly...	23

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