GM Automotive Technicians Technical Discussion and Fixes for Feb 22, 2008 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2002 Buick Century Custom 3.1L Engine VIN: 2G4WS52J22 This car came into our shop with an appointment to change out the low cooloant level sensor. Upon removing the radiator cap it became obvious that there was a substantial amount of oil in the cooling system. Explains why the level sensor failed! The engine oil...	View
	2001 Cadillac DeVille 4.6L Poor Idle Quality, Stall VIN: 1G6KD54Y01 This vehicle owner is complaint is that the vehicle will start cold and run rough part of the time. Also the vehicle will start and stall. When the vehicle came in I checked for codes found p0106 map senser voltage. I looked at the freeze frame the code set at... Trouble codes: P0106	View
	1991 Chevrolet S10 4.3L Cooling system VIN: 1GCCT14ZOP Hey fellow Techs. I have never seen anything like this. But hopefully you have. This truck came in with no thermastat, customer took it out. Says will run hot if he leaves it in. He has put two in and we have put two 195 and the last 160.The problem is they wo...	View
	1994 Chevrolet C1500 Cheyenne 4.3L Poor Idle Quality, Hesitation, Stall, Misfire VIN: 1GCEC14Z8R Hi guys, this truck has me pulling my hair out. It came in with a complaint of misfire when wet. I tested coil and cap with water and both were arcing. Replaced and all was good (so I thought). Customer picked it up after it had been sitting in the cold all da...	View
	1994 Chevrolet Lumina 3.1L Excessive Emissions VIN: 2G1WL54T8R the scanner is showing lt fuel trim at 156 and fuel trim 148 tps .68 iac 18 map 40 kpa, 1.6v seems to run very nice but won,t pass emissions is the fuel trims supposed to be at 128? and are these readings showing a rich mixture?	View
	1997 Chevrolet C3500 Cheyenne 5.7L brake pedal VIN: 1GCHC33R1V customer states that when brake pedal is applied, it goes to the floor and does not return when released. road tested vehicle, verified that brake pedal does go to the floor. vehicle does have some braking, locks up right rear at times. when pedal is released ...	View
	1997 Chevrolet K2500 Cheyenne 7.4L timing chain VIN: 1GCGK29JXV This truck appears to need a timing chain and sprockets; the distributor isn't turning. I've received conflicting advice as to whether the valves won't hit the pistons, might hit the pistons, or will definately will hit the pistons. I have customer approval to...	View
	1998 Chevrolet C1500 Cheyenne 4.3L No Start VIN: 1GTEK14W2W ok guys i am lost again.customer had truck towed in,crank no start.it will start for a sec. and cut off like injecters shutting down. he said security light stays on all the time.i did relearn and the light stayed on never cut off or blinked no matter how long...	View
	1998 Chevrolet Malibu 3.1L power condition VIN: 1G1ND52M2W vehicle has lost power for items run off of ignition power, like blower motor turn signals etc. and it only happens to the cusomer, never in my shop, all i get are the codes, customer complains of no heat and other things related to power loss , all testing of... Trouble codes: B1379, P1602	View
	2003 Chevrolet Trailblazer LS 4.2L Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 1GNT13SX22 Has a clear #2 misfire at idle (seems ok under load) Replaced original plugs 175k. No change. Checked LTFT -12% Ckecked for CAM counts seems ok I'm not positive how they normaly work this one slowly counts up then starts over (no codes) When cam sensor is disc... Trouble codes: P0302	View
	2005 Chevrolet Equinox LS 3.4L MIL Lamp on VIN: 2CNDL23F65 Hi everyone Vehicle has no ground at vent control wire(white) at vent solenoid. Does have correct control at pcm. Wire goes through electrical center. Wondering if anyone has seen this or if anyone has pinout of electrical center. Alldata isnt much help. Or if... Trouble codes: P0449	View
	1995 Geo Metro 1.0L r/r VIN: 2C1MR2267S repaet wheel bearing failure in r/r any help??? would be great	View
	1998 Oldsmobile Aurora 4.0L block heater VIN: 1G3GR62C5W Hello all, This '98 Aurora came in for coolant leak repair. Pressure check showed it leaking on the driver's rear of the engine between engine and tranny. Couldn't put eyes directly on the leak but because of the area of the leak I condemmed the water crossov...	View
	2000 Pontiac Montana 3.4L abs VIN: 1GMDX13E4Y This one has a weird problem phoned GM TAC center as well when the traction controll comes on it applys the brakes hard enough to stop the vehicle if you stay on the gas the vehicle wont move, anyone encounter this? just a shot in the dark the controll valve m...	View
	2003 Pontiac Grand Am SE 3.4L fluid level VIN: 1G2NF52E03 I need to do a transmission maintenance service. I cannot find a fill amount or a procedure for checking the trans fluid level except in the owners manual saying to take it to the dealer. Help!!	View
	1994 Saturn SC2 1.9L Mechanical VIN: 1G8ZG1574R Hi guys I need help. This car came in it had a leak in the front of the trans manual 5 speed it would still drive fine but leaked out all the fluid. Romoved the trans and found the case was broken. I replaced the trans with one from a salvage yard. put it all ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2001 Buick Park Avenue 3.8L Excessive Emissions, Poor Idle Quality, Cuts out, Stall, Poor Fuel Economy, MIL Lamp on, RUNS RICH VIN: 1G4CW54K41 I would like to thank everyone for the great help that I got. As most thought it was a ground or a bad M.A.F. sensor (includes me) I cleaned all the grounds on body and block and tried a new M.A.F. sensor, but none of this fixed the problem. So I looked on the... Trouble codes: P0101 (maf).	11
	2002 Buick Park Avenue 3.8L horns VIN: 1G4CW54K32 thanks for the replies. I was checking connection at back of fues block and checking the wiring from fuse block to firewall short to ground on relay control circuit went away. Horns began working ok. Inspected wiring but did not find short. Customer did not wa...	3
	1992 Chevrolet C1500 Cheyenne 7.4L shift solenoid VIN: 1GCDC14NZ1 Found out vehicle pass through connector was updated from a 12 pin to an 11 pin when it was replaced there was originally two ign. powers changed to one ign. power feed, when this repair was done one lead was abandoned way up in the loom. the proper way is to...	13
	1994 Chevrolet Camaro 3.4L Hydraulics VIN: 2G1FP22S0R The shop that sent this vehicle to us declined our suggested repair. We agree with the many suggestions of replacing the hydraulics with a set up that comes out of the box from General Motors ready to go. We also wanted to remove the bell housing to inspect ...	19
	1999 Chevrolet S10 2.2L MIL Lamp on, loss communication VIN: 1GCC5144XX My first mistake was to buy a reman unit against better judgement vehile was hardly worth the money spent the ideas and knowledge from this site are awesome great response. The approach i took was abandon the reman replace with factory ecm program and flash no... Trouble codes: P0405, P0502, P0713, P0753, P0758, P1602.	7
	2002 Chevrolet Venture LS 3.4L No Start VIN: 1GNDX03E62 HELLO AND ONCE AGAIN THANKS TO ALL THOSE WHO OFFERED HELP. THE VENTURE IS FIXED MORE BY ACCIDENT RATHER THAN BY DIAGNOSIS. SOME HOW I KNEW IT WAS RELATED TO THE CHECK ENGINE LIGHT. THE SOLUS DATA ON ALL OF THE COMPUTERS WAS LIMITED ,A MAC MENTOR WOULD ACCESS A... Trouble codes: 1336 (crk relrn not done since comp replaced).	13
	2003 Chevrolet Suburban 1500 LS 5.3L MIL Lamp on, reduced power VIN: 3GNFK16Z43 Sent to dealer, they claimed that they could not duplicate symptoms, however they did recommend new TAC module. They ended up replacing TAC motor assy and connector,and reurned to customer. Customer said working fine so far. When truck comes back in for regula... Trouble codes: P1518 (TAC Module).	4
	2002 GMC Envoy SLE 4.2L transfer case clutch VIN: 1GKPT13S72 Most responses mention checking tire sise very carefuly. This unit had new tires of the same size. Checked anyway and are fine. No mention of any known electrical faults. The rebuilder warented the t-case and the customer was warned again about shifting out o...	6
	1989 Pontiac Firebird 5.0L Cuts out, Misfire, MIL Lamp on VIN: 1G2FS21E4K First- thank you to all who replyed! As you could tell, I had gone through the obvious, high age/mileage possibilities with this vehicle. All parts replaced were original, from factory, (except for plugs, wires and filters). The owner understood that many issu... Trouble codes: 32 (EGR error), 34 (map), 43 (ESC Failure Knock Sensor).	7
	1998 Pontiac Sunfire SE 2.2L clutch VIN: 1G2JB1247W Hi: I end up replaced the reservior and hose assmebly and another new master cylinder. Customer has been driving the car for two weeks now. Thank You for all the helping.	5

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