GM Automotive Technicians Technical Discussion and Fixes for Jan 13, 2006

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Open Help Requests for GM

	Help Request	Answers
	2001 Buick LeSabre Custom 3.8L power door locks VIN: 1G4HP54K51 Good morning, techs. I'm in over my head and I could use some help from the GM Gurus. The complaint on this Buick is door locks inop. Using a Mastertech I am finding code U1255 - no communication with the DDM (driver door module) and the IPM (instrument panel ...	View
	2001 Buick Regal LS 3.8L Poor Idle Quality, Cuts out, Stall VIN: 2G4WB55K41 car stalls on start up after sitting for about 10mins. after being driven. it doesn't matter how long you drive it and it never stalls while driving or has any drivabiliry problems. starts good cold or hot if restarted right away. after it stalls the second ti...	View
	2000 Cadillac DeVille 4.6L cooling system VIN: 1GEEH90Y0Y The car can run inside the shop at idle for unlimited amount of time and will not overheat. About 20-30 minutes of highway driving before the car will start the gauge climbing. When car is overheating the pressure pushes the coolant out the overflow jug. The c...	View
	1983 Chevrolet Monte Carlo CL 5.0L check engine light VIN: 1G1AZ3772D purchased this car for myself, previous owner took carburator off, knocked out factory plugs for idle-air adjustment. i was told that he removed, cleaned, and "guessed" about where the idle screws were originally! the car does not run bad, just a little ruff i...	View
	1994 Chevrolet Camaro 3.4L Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 2G1FP22S1R Vehicle came in with misfire, black smoke, rich exhaust. Had low spark on cyl 2 and 5. Changed the coil pack, no change. Changed the spark plugs and the wires and it ran great. One month later returned with same problem. Compression is good, 130+/-5. The plugs...	View
	1994 Chevrolet Corvette 5.7L Power Seat VIN: 1G1YY22P4R This car has a short in the Power seat circuit, I have traced it to a defective circuit diode. It is installed at the connector on the body harness side of the circuit. If it was on the switch side of the circuit, it wouldn't be a problem, since it is on the b...	View
	1996 Chevrolet Beretta 2.2L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1G1LV1542T missfires on 1 & 4 cyl. hist stores for #2 & 4 cyl have swaped injectors, replaced ignition module,coils,plugs @ wires have replaced pcm compression 125psi ave per cylinder showes missfire counts on # 1& 4 in closed loop force open and missfire is #2 cyl only ... Trouble codes: 300 (randam missfire)	View
	2000 Chevrolet Express 2500 6.5L No Start VIN: 1GAGG25F2Y hey guys im sure this is a easy one, but replaced the fuel filter in this 2000 chev 2500 van with the 6.5 liter, started it ran fine for about 30 seconds then died and will not restart, i have no fuel press and no flow at the bleeder on the fuel filter adaptor...	View
	2000 Chevrolet Express 3500 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall hot soak idle down low, cannot accellerate, pops in intake, restart it runs fine	View
	2001 Chevrolet Tracker LT 2.5L No start VIN: 2CNBJ63451 Help! I Have a chevy tracker (suzuki engine) towed in as a no start. checked items listed above and initial no start procedures. then performed compression test, resultes showed bad. they are as follows: Dry: 1. 60 2. 30 3. 40 4. 30 5. 50 6. 30 Wet: 1. 140 2. ...	View
	2001 Chevrolet Silverado 2500 HD 6.6L Surge, MIL Lamp on VIN: 1GCHC29181 This truck runs fine untill its loaded pulling a trailer and after 20-30 miles it will like sudder on light throttle going up a slight incline at cruise and then evetually will lose power and the trans will keep downshifting and you can't get 20mph out of it. ... Trouble codes: P0093	View
	2002 Chevrolet Trailblazer LS 4.2L transfer case VIN: 1GNDT13S12 Hello all. I am working on a trailblazer that on occasion will not shift from where ever the 4wd selector switch is positioned. Generally after sitting for a while after the 4wd was used on the previous trip. When you start the vehicle the 4wd selector will f...	View
	2003 Chevrolet Trailblazer North Face 4.2L starting VIN: 1GNET16S53 there is a banging nose when staring & shutting off there don:t seem to be any thing lose feel like under driver seat or fllor board only feel during start up or shutting off help...	View
	1997 GMC C1500 Sierra SL 5.7L trans & gauges VIN: 1FABP37856 Hello i once found a fix on here that had to do with transmission problems and instrument problems and i can not locate it... The problems included codes p0740, p0785,p0758 & p1860 on 96 & up. The fix was the power relay system and I have no idea what exactly ...	View
	2001 Oldsmobile Intrigue GLS 3.5L temp VIN: 1G3WX52H21 I have a olds that overheats at low speeds therm. was replaced by a friend have removed water pump to check fins all is well rad has good flow the lower hose never gets hot upper hose does removed therm while eng was hot noticed it was barely open i replaced t...	View
	1998 Pontiac Trans Sport Montana 3.4L Sliding Door VIN: 1GMDX03EXW The power sliding door closes most of the way and then opens again. It will not close all the way. Alldata has a TSB that says to replace the wiring harness and contacts. We did that and it did not fix the problem. Alldata says that on extended wheelbase vans ...	View
	2002 Pontiac Aztek 3.4L oil cunsumption VIN: 3G7DB03E32 this vehicle will consume about 1 1/2 quarts of oil after an oil change within [...]. there are no oil leaks, pcv valve is working properly, and no oil residue in the exhaust pipe. it's a 3.4L and i havn't seen one that consumes this much oil w...	View
	1992 Saturn SL1 1.9L Poor Idle Quality, Misfire VIN: 1G8ZH5497N This one has a miss at idle with the engine hot and trans in drive. It is a random miss but a pretty hard miss. Replaced coils, plugs, wires. I am not sure if the miss is ignition related or fuel related. BLM is 108-120, (120 driving and 108 idling. Integrator...	View
	2000 Saturn LS2 3.0L No Start VIN: IG8JW52R7Y Friend's This Saturn, came to me on a tow truck with a no Start problem, Costumer bought the car not long ago and was at the Dealer for a no start problem about a month ago, the costumer also pull the Battery out to have recharge, so when i got the car all co...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1990 Cadillac DeVille 4.5L gauges VIN: 1G6CD1338L thank you Ted [...] the fix was cut the light blue wire circut 811 at the body control module in c2. it was the ground for the metric system vehcile does not have an e/m button it aslo has a dial type speedo. still doe not know why it ever swit...	5
	1993 Chevrolet Lumina Euro 3.1L lots of codes VIN: 2G1WN54T5P thanks out there for all the help this car had been to several shops went back to customer did just a little of pulling teeth and came up with some addtional info many parts replaced , by other shops... but wer tested ground they were good did the tap test whi...	20
	1996 Chevrolet C1500 Cheyenne 5.0L Excessive RPMs VIN: 2GCEC19M6T Well, it it fixed. A new ECM was the fix for this animal. After checking all of the suggestions received (possible vacuum leak under throttle body in particular can be very sneaky. A defect in IAC valve or cicuit, cruise control activity, a possible Instrument...	7
	1997 Chevrolet Tahoe LS 5.7L Misfire VIN: 1GNEK13R5V sorry it took so long .think i finlly fixed miss checked injectors found cyl 7 bad replaced with new one.but still had slight miss when cold got better when warmed up replaced lower intake gasket fixed miss found defective gasket.thanks for all the help Trouble codes: P0300 (random cyl misfire dectected).	35
	1997 Chevrolet Express 2500 5.0L No Start, no spark I would like to thank everyone again for responding. What I found was the new IC module had an internal open on the ground pin. When you checked for ground it was ok with the connector on because the wires were grounding, but internally the module had no conti...	4
	1998 Chevrolet Prizm 1.8L Poor Idle Quality, Hesitation, Surge VIN: 1Y1SK5281W Well, I received four replies. Two of those were just requesting more info from me, one suggested MAF but this car doesn't have one. The last reply said to check TPS. Customer has taken car and because this problem was so intermittant they have decided to live...	4
	1999 Chevrolet Monte Carlo 3.8L steering Hi guys. Thanks for all the replies guys a lot of great ideas. Special Thanks to Vern [...] and Sahag. They nailed it. It was indeed the starter drive broken. When you made a right turn the starter gear would slide to the left and just contact the flywheel ...	12
	1999 Chevrolet C1500 Suburban 5.7L Poor Idle Quality, MIL Lamp on VIN: 3GNEC16RXX First, thanks to all that replied to my service request. Most of you responded with the problem being the fuel pressure regulator. We did determine that to be the case and after a total review of the vehicles health (160,000 miles), we decided to change out th... Trouble codes: P00, 172 (System too rich left bank), P00, 300 (Eng. Misfire detected).	39
	1999 Chevrolet C1500 Suburban 5.7L Poor Idle Quality VIN: 3GNEC16RXX First, thanks to all that replied to my service request. Most of you responded with the problem being the fuel pressure regulator. We did determine that to be the case and after a total review of the vehicles health (160,000 miles), we decided to change out th...	6
	1999 Chevrolet Silverado 1500 5.3L MIL Lamp on VIN: 2GCEK19TXX Thanks to the iATN members this vehicle is fixed. I knew in the back of my brain this thing had to have a vacuum leak, but when smoked three times at different temperatures and none showed any sign, I went off in the wrong direction and wasted a lot of time. T... Trouble codes: P0171, P0174.	20
	2000 Chevrolet Silverado 2500 6.0L Lifters? VIN: 1GCGK24U3Y You guys came thru again. First a summary of good information that it could have been..The valve train is a roller lifter with a roller bearing pivot on rocker arms. TSB# 02-06-01-029 addresses the issue of rocker arm bearing failure..we inspected for that on ...	13
	2001 Chevrolet Silverado 2500 6.0L Misfire VIN: 1GCHK29UT1 Thanks too all that replied. Guys we found the fuel pressure regulator leaking fuel into the intake. Evidently #4 gets the majority of the fuel, #3 a little less. Replace regulator and problem is solved. Trouble codes: P0300 (Random), P0303 (3 miss), P0304 (4 miss).	11
	2002 Chevrolet Cavalier LS Sport 2.2L MIL Lamp on VIN: 1G1JH12F12 Some suggested the warped head bypassed enough coolant to bias the #1 oxygen sensor, but the oxygen sensor readings loked good to me. Several suggested that I had a vacuum leak, but the vacuum gauge did not waver from a steady 20' and spraying carb cleaner rev... Trouble codes: P1005.	10
	2002 Chevrolet Tahoe LS 5.3L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNEK13Z72 hello i finally fixed this one doug from utah fit it, the bank 1 sensor 1 was the problem .i was driving it to lunch with the tech 2 on it in live plot mode and 5 miles in to my drive the bk1 sensor 1 would start to slow down and drop out to near 0. sure enoug... Trouble codes: P0300, P0171, P0131.	11
	2002 Chevrolet Avalanche 1500 5.3L MIL Lamp on VIN: 3GNEC13T52 Thanks to all who responded. I did not get an answer to my original question about Mode $06 information, but am heading to a Mode $06 class this weekend, so maybe I'll find out. I manually tested the EVAP system on this Avalanche and it's been a couple of week... Trouble codes: P0440 (EVAP system).	6
	1996 GMC Safari SLE 4.3L Hesitation, Cuts out, Stall VIN: 1GKDM19W4T thanks every ones for your helps. i saw the ground at the t-stat housing been reppaired. i wiggle and look in my master tech scanner the misfire was gone. i though it was fix the problem so i remove and weld and sercured the ground at the s-stat housing and re...	13
	1996 GMC Sonoma SL 2.2L Hesitation, Stall, MIL Lamp on VIN: 1GTCS1446T First I would like thank all who have taken time from there already busy day to send help and information to us for this troublesome GMC. We are not sure at this time if the problem has been repaired, we did find bad connections to the battery. Cleaned and rei...	17
	1999 Pontiac Firebird 3.8L Misfire VIN: 2G2FS22K1X First of all, thanks for all the great help. I tried most everything suggested, and Jon from Nebraska gave me the winning combination. I used the test light to see if the module was firing the coil pack and it was. I had one bad original coil, and one of my ne...	28

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