GM Automotive Technicians Technical Discussion and Fixes for Aug 10, 2006 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1993 Buick Park Avenue Ultra 3.8L alternator VIN: 1G4CU5313P original problem was volt meter in dash droped to 10 volts. customer did not wan't problem diagnosed, just wanted to replace alternator. on initial start no load voltage reading is 13.9 volts. alternator will put out 100 amps on request. loaded with headlamps,...	View
	2000 Buick LeSabre Custom 3.8L Performance VIN: IG4HP54K1Y This is not a dual climate control system. 68 degrees out drivers side and 41 degrees out of pass side. Car came in with no a/c complaint. Tech ck air on drivers side and it was 70 degrees. He sucked the system down and recharged to find that it was not low on...	View
	1987 Cadillac Allante 4.1L headlights, brake, parking, dash lights, no radio, VIN: 1G6VR3172H Hello I have a caddy, allante that runs but no outside lights of any kind, no heating system, no radio, no dash, check many fuses with no problem found. Has a very odd lighting system. The cooling fan on the radiator runs all the time the key is on. The heat...	View
	1996 Cadillac DeVille 4.6L Vibration VIN: 1G6KD52Y5T Hi guys. I have this caddy that I can't find this vibration. I have replaced the tires, rotors, axles, swapped hub bearings, still no help. I feels like right front. I used a vibration analyzer and it tells me it is the final drive. Starting to consider maybe ...	View
	1997 Cadillac Seville SLS 4.6L Mechanical VIN: 1G6KS52Y1V can any one tell me where the orvice tube is on this vehicle.it looks like it should be at the evaporator but there is not one there[someon may have removed it at the fitting was loose at the evaporator	View
	1998 Cadillac Seville SLS 4.6L Cooling Systems VIN: 1G6KS54Y3W Hi hope someone can HELP? Engine overheats under load. Previous shop replaced water pump vehical still overheating told customer needs head gaskets. First thing we did was block test. Passed block test. Thought T-stat may be stuck. Replaced T-stat still no cha...	View
	1994 Chevrolet Camaro 3.4L No Start, Hard Cold Start VIN: 2G1FP22S6R Thanks in advance for your help, this one is killing me. Originally vehicle came in as an intermittent hard start, customer would have to apply throttle 1/2-3/4 way before vehicle would start. This usually occured for him cold. Of course we verified the condit... Trouble codes: 82 (3X Sensor Error)	View
	1995 Chevrolet Cavalier LS 2.2L Stall VIN: 1G1JF5247S hi. car has died 3 times in six mo. restarts right away.it does this just driving along. it hasnt died for me. scan data looks normal except for injector pulse width is at 6.7 ms and long term trim is at 118. the only clue is in scan data , and it says quad dr...	View
	1995 Chevrolet C1500 Suburban 5.7L Internal Trans VIN: 1GNEC16K8S I am trying to rebuild my first transmission (do you here the jaws music playing in the background?). So please don't be critical of my ignorance. The trans is a 4l60e. Its problem was it would take off at first start up and start slipping after about half a b...	View
	2000 Chevrolet Malibu 3.1L No Start, HARD START VIN: 1GND52J8Y6 This ones a little strange . One of my techs started working on this and it started out as a classsic ign switch probelm ,anti theft light coming on ect, he replaced the key tumbler and switch ,was good for a few days then acting up again with out the anti the... Trouble codes: P1626 (loss of class 2 data)	View
	2002 Chevrolet Trailblazer LS 4.2L electric windows, door lock & dome light VIN: 1GNDS13S22 hey guys, this trailblazer has an intermittant problem with the ele windows, door locks and dome light that happens all at the dame time. when the dome light will not turn off, you cannot operate the door locks or the electric windows from the master door swit...	View
	2005 Chevrolet Aveo LS 1.6L pads VIN: KLITD62604 This silly little thing came in for a brake inspection. I removed all four wheels and found the brakes to be in like-new condition. However, when the brakes are applied at 55 mph +/-, there is an terrible noise coming out of the front. Sounds like a bearing go...	View
	2003 Hummer H2 6.0L ebcm? VIN: 5GRGN23U63 Hello I have this 2003 Hummer H2 With an ABS and TRACTION lights on and code c0110. I have checked power and grounds wich are ok Resistance of pump motor is about 50 Ohms checked with DMM resistance between pump motor wires and motor case approx 500000 Ohms. I...	View
	1994 Oldsmobile 88 Royale 3.8L No Start, Stall VIN: 1G3HN5219R This car came in with a complaint of dieing intermittenly.I have ran basic voltage test, chg. sys. , body and eng. gnds,voltage drops for these also and all were ok. Upon scanning the car to watch datasteram revealed nothing out of the ordinary. Car did die af...	View
	1997 Pontiac Grand Am SE 2.4L Hesitation, Surge, MIL Lamp on VIN: 1G2NE52T6V Vehicle came in with MIL on and DTCs in memory. Looking at the data w/engine running showed TP% at 23%, EGR% at 65% but engine running smoothly. Backprobing the EGR 5V reference showed almost battery voltage and same with the TPS. But, with KOEO, they were bot... Trouble codes: P0121 (TP sensor problem), P0404 (EGR feedback signal out of range), P1404 (EGR-2 position error/EGR closed perf)	View
	2002 Pontiac Grand Am SE1 3.4L No Start VIN: 1G2NF52F92 the car has no injector pulse due to theft system.i cannot find anything to point me in the right direction.i can reset system and it will work for awhile.thanks in advance.	View
	1999 Saturn SL2 1.9L Misfire VIN: 1G8ZJ5270X Hi fellow, This is problem here drive me crazy, car come in running rough, check for code found po301 cly one misfire, the shop before me had replace coil, module, wires, spark plugs, ecm, injector, rewires injector signal for #1 cyl. But none of that solve th... Trouble codes: P0301 (cyl one misfire)	View
	2000 Saturn LS2 3.0L Poor Idle Quality, Hesitation, Stall, MIL Lamp on, low power VIN: 1G85W52R8Y Car came in for engine noise. We diagnosed the problem as water pump and tensioner pulley noise. Pretty straight forward at this point. This engine ran normal before we worked on it. After the repair, noise still eminated from the alternator and engine ran poo... Trouble codes: P0343 (Cam sensor circuit voltage high)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1983 Buick Riviera 5.0L lock-up VIN: 1G4E25H687 i replaced lock-up solenoid but customer states still acts up at times but not like before?? ty for the help.	16
	1988 Buick LeSabre Custom 3.8L No Start VIN: 1G4HP54C1J Found the Dorman Balencer, Replaced the sensor, Measure over and over the air gap for the sensor the car hass been gone a week now with no return. Thanks everyone.	22
	1988 Chevrolet Caprice 5.0L MIL Lamp on VIN: 1G1BN51H5J Thanks to Dan [...] for getting me to thinking more about how this system looks for a knock during the functional teat performed by the ECM. I had my mind wrapped around the part of the trouble tree that looks for the ESC signal staying low for too long a... Trouble codes: 43 (ESC Voltage Low To ECM).	13
	1995 Chevrolet K1500 5.7L Cuts out, Stall, MIL Lamp on VIN: 2GCEK19KXS Thanks IATN!!! I got many great responses with a lot of helpful new tricks to add to my arsenal. Jim from AL and Gary from AZ got this one right. They pointed toward the MAP sensor. From their input and the testing I did, I felt good about replacing it. The tr... Trouble codes: 15 (Engine Coolant Temperature ECT Sensor Circuit High Low Temp.), 34 (Manifold Absolute Pressure MAP Sensor Circuit Low High Vacuum), 35 (Idle Air Control IAC Error), 54 (Fuel Pump Relay Circuit Low Voltage).	11
	1998 Chevrolet Express 1500 4.3L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1GCFG15W6W Sorry for the long wait. but I just got the car back on monday I got A used computer for it and sent it to the dealer to get flashed .The tip off was when this ran bad it would not set a code and it ran bad enough to at least set misfire codes when I pulled ou...	15
	2000 Chevrolet S10 2.2L 2nd, 4th, VIN: 1GCCS1958Y I monitored the A&B shift soleniod with a vantage multi-meter and the 1-2 solenoid had battery voltage when computer commanded the solenoid to turn off. I checked the wiring from PCM to trans and wiring was ok. Replaced PCM and cured problem. Thanks Ted from M...	4
	2002 Chevrolet Tahoe LS 5.3L p/s pump VIN: 1GNEK13Z62 after flushing system and verifying steering wheel position sensor was reading correctly , I replaced steering gear and problem was solved . I then had to argue with extended warranty company for 3 days to get paid on job	7
	1992 Geo Tracker 1.6L No start-runs rich VIN: 2CNBJ18U7N Many replies mentioned cam and crank alignment and THAT was the fix. Vehicle came in with cam pulley mark retarded 4 teeth and I thought that a Back-Yard Bob had mis-timed the cam. This vehicle MAY have an incorrect cam pulley on it. Alldata AND the shop manua...	9
	1998 Oldsmobile Bravada 4.3L temp control VIN: 1GHDT13WXW my boss started to fix the truck when i got to dive in. well he diagnosed it to be a blend door accuator and pluged it in to the truck and it didnt work so he bought a new one and did the same thing and it didnt work. so i then checked it out and came up with ...	4
	1999 Oldsmobile Silhouette GL 3.4L radiator VIN: 1GHDX03F8X Again I want to thank everbody who offered me help with this problem. I had bot the block and the heads tested for cracks, and nothing came up. I pressured check the oil cooler throuh the coolent passage, and nothing. So I clamped 2 steel plate to either side ...	5
	1994 Saturn SL1 1.9L Hesitation, Stall VIN: 1G8ZH559XR ok, well, we installed a factory ignition module, and according to the tech, it ran alittle better. the custome opted not to spend any more time or money on the car...	7

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