GM Automotive Technicians Technical Discussion and Fixes for May 2, 2005

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Open Help Requests for GM

	Help Request	Answers
	1995 Buick Riviera 3.8L Twilight Sentinel and Auto headlights VIN: 1G4GD22K6S Headlamps work in manual mode but not in automatic mode and Twilight Sentinel does not work.The headlight switch on this car grounds various outputs from the Lamp control module.The ambient light sensor changes resistance from around 1000 ohms with a flashligh...	View
	1998 Buick Regal LS 3.8L starting and dash lights VIN: 2G4WB52KW1 dash flickers from miles to kilometers while running. abs light and traction light on.. no codes. starts sometimes and sometimes when cranking starter ingages and disengages on its own. sometimes will not crank starter at all. seems to have a mind of its own. ...	View
	2002 Buick Rendezvous CX 3.4L oil leaks VIN: 3G5DB03E32 anybody ever replaced the front timing cover and oil pan gasket on one of these? this one has a huge oil leak. mitchell shows nothing for service procedures. labor times look a little high at over 8 hours. any advice would be welcome thanx	View
	1984 Cadillac Fleetwood Brougham 4.1L power seats VIN: 1G6AW4783E This Cadillac has what appears to be an intermittent short in the power seats. The car had a dead battery and when I hooked up the jumper box I heard a clicking in the passenger compartment. I traced the sound to drivers side power seat. I found that while the...	View
	1989 Cadillac DeVille 4.5L climate control panel VIN: 1G6CD5150K HELLO CADDY PEOPLE. I HAVE BEEN FIGHTING THIS ONE FOR QUITE AWHILE. CAR CAME IN WITH CLIMATE CONTROL PANEL AND FUEL DATA DISPLAY BOTH DISPLAYING A LOWERCASE C. BLOWER MOTOR AND COOLING FANS ARE ON FULL SPEED. ALSO RETREIVED A CODE 47 UART LINK PROBLEM (WITH SN...	View
	1994 Cadillac Eldorado 4.6L No Start VIN: 1G6EL12Y7R it was running we put head gaskets and resealed the lower crankcase, now it won't run, it tries to run all sputtered out, this code 53 is up. we scoped the crk a and b and cam sensor they all seem OK, and we rechecked the chain marks and they seem OK Trouble codes: 53 (4x not recieved)	View
	1996 Cadillac Eldorado ETC 4.6L No Start VIN: 1G6ET1298T Customers vehicle will occasionally not start. When no start occurs car has no security light,no drivers info,no radio,no climate control, and service engine soon light does operate correctly. Car will then start and run for 3 seconds and then stall. Car will ... Trouble codes: 1R, 1740, PC162	View
	1988 Chevrolet S10 2.8L No Start VIN: 1GCCR19R2J This is a truck with a very obvious DIY mechanical history. Wires have been cut, insulation stripped, parts changed with possibly wrong replacements, etc. The customer has another truck the same year and has changed several parts. Customer said to begin with, ...	View
	1993 Chevrolet S10 Blazer Tahoe 4.3L No Start VIN: 1GNDT13W7P Car was towed in would not start cranked fine after battery charged. I replaced the fuel pump and still only get 20 psi of fuel pressure with the tank removed and reading pressure directly at the pump. Any input more than welcome, Thank You. Bill	View
	1994 Chevrolet S10 4.3L 4wd VIN: 1GCDTP1W3R after sitting overnight sometimes this truck will show that its in 4hi even though it was in 2hi when it was parked. When it does this you can't get it to shift out of 4hi either unless you disconnect the battery then it shifts normally. This is intermittent i...	View
	1998 Chevrolet Astro 4.3L Misfire VIN: 1GCDM19W6Y replaced cap and rotor button everytime it is very wet out, cap seems to fit fine, but there it is always damp, 3 caps in 30,000 km. anybody seen thsi before?? thanks chad Trouble codes: 300 (missfire)	View
	1999 Chevrolet K2500 Suburban 7.4L No Start VIN: 1GNGK26J9X After brakes repaired, the engine wouldn't start so test drive could be performed. engine starts for only a second and dies, just like the fuel was cut. Checked for DTC's with the scanner and found a p1626. Checked alldata and found extremely limited info on t... Trouble codes: P1626 (loss of signal communication w/ vtd)	View
	1999 Chevrolet Malibu 3.1L Cooling system VIN: 1G1ND52M3X We put intake gaskets on this 3.1 about 2000 miles ago. Now, there is about a quart of oil in the cooling system tank. It definitely is engine oil. We used GM parts & the like. Has anyone seen this happen to this engine? There doesn't seem to be any oil pressu...	View
	2000 Chevrolet Malibu 3.1L cruise control VIN: 1G1ND52J6Y Hey everybody. this car intermittantly loses cruise control. you can always hit resume and it will work again for a second and cut back out again. this will hapen four or five times in a row and then it will work correctly for a long time. there are no codes s...	View
	2000 Chevrolet S10 2.2L Hesitation, Cuts out, MIL Lamp on VIN: 1GCCS144XY This truck will intermittantly lose power on acceleration and will not want to accelerate after engine is warm then service engine soon light will come on. Customer will turn ignition off then restart engine the engine will go back to running normal. After dri... Trouble codes: P0122	View
	2003 Chevrolet Suburban 1500 LT 5.3L compressor fuse VIN: 1GNFK16Z33 Hey GM techs this my own vehicle the wife drives. No a/c found 10 amp fuse for compressor blown. Replaced fuse, a/c sytem worked good for 1 day and blew again. Checked for tsbs and the archives for any common complaints, nothing. Before I go nuts has anyone ha...	View
	1992 GMC C3500 HD 7.4L No Start, no comunication VIN: 1GBKP37NXN Do you sometimes wish that you just said no? I do!! Say no to motorhomes!!! Anyway, I thought that this beast was fixed, but I guess not. I'm haveing computer problems now. This thing originally came in with a no poor running condition, and with process of e...	View
	2002 GMC Yukon Denali 6.0L master` VIN: 1GKFK66U42 this vehicle come to the shop with brake pedal, pulsation at 5mph or less ,is not something like the rotors it feel like the abs is actuating for no reazon i did replace the front brakes due to low brake pads but the simptom was there before we replace the bra...	View
	1998 Oldsmobile Aurora 4.0L p/d locks Everything was working fine and we tried to unlock and lock the doors several times using all the switches and the fob. All was well until we tried to move the car. We put into reverse and the doors locked like they are suppose to and when we put it into park ...	View
	1999 Oldsmobile Alero GL 3.4L suspension or body VIN: 1G3NL52E1X This noise occurs when you are backing up and while you are backing up you turn the wheels to the right and while backing up you hear a pop sound under the driver floorboard.Everytime you back up and turn to the right you hear just one pop sound.Going forward ...	View
	1985 Pontiac Firebird Trans Am 5.0L Poor Idle Quality, Stall VIN: 1G2FW87F0F hello all, thank in advance. this car has an erratic idle which is resulting in an intermittent stalling when decelling or when putting trans. into gear. suspected a possible idle air control motor, replaced with a known good one-no change. found the mass air ...	View
	1996 Pontiac Grand Am SE 2.4L MIL Lamp on VIN: 1G2NE52T4T THIS VEHICLE CAME IN WITH MIL LIGHT ON AND CODE P0134 STORED.CHECKED DATA AND FOUND O2 WAS 430mv AND NOT MOVING.WOULD NOT ACHIEVE CLOSED LOOP AS WELL.DATA ON TECK 2 SHOWS REAR O2 WITH NONE THERE.FOUND PLUG WIRE SOCKET FOR REAR O2 AND IT WAS FACTORY CAPED OFF.N... Trouble codes: P0134 (insufficieat activity sensor 1)	View
	2000 Pontiac Grand Prix GT 3.8L abs light VIN: 1G2WP12K6Y Car orignally came in for alignment, in suspension inspection we found both front wheel bearings were loose. A couple weeks later car came back in with abs light on & trac light on, customer says in comes on under 10 mph. When attempting to retreive code with ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2000 Buick LeSabre Custom 3.8L Misfire VIN: 1G4HP54K3Y I had 12 replies, alot suggested possible fuel contanmination & rusted up fuel rail. We had already inspected fuel rail & it was clean. We had also already replaced fuel filter & inspected screens in injectors. paul [...] from illinois susggested calling linde... Trouble codes: P0300.	12
	1990 Cadillac Seville 4.5L Blower motor VIN: 1G6K5537LU First let me say there was an overwellming responce to my request. To many to list them all. But I have to say thanks to Doug [...] at Altantic Auto Supply and Service in Norfolk VA. He has offered to help me do the relearned on the idle problem since I do ...	22
	1993 Cadillac DeVille 4.9L turn singals VIN: 1G6CD53BXP Well everyone we got the caddy turnsingle to work. Jeff from misouri had the location of the turn sing flasher, it was mounted on brake pedal bracket, repl flasher and works good. I wonder why the manuels are never correct on turn singal location you all have ...	8
	1997 Cadillac Seville STS 4.6L ac VIN: 1G6KY529XV I guess 'everything is fine' in the middle of a sentence was a poor way to say that there was NOTHING wrong with the system after I recharged it. This includes leaks...sure the freon leaked out, but the system still passed leak tests and has no concern there. ...	11
	2000 Cadillac Escalade 5.7L vtd VIN: 1GYEK63RTY WELL...this problem has only occured twice since I posted...neither time at my shop. However, I went to his house on one of the occasions and it appeared that the vtd/evo module was not powered up. I have a mastertech but not the proper software...still on mod...	3
	1972 Chevrolet CORVETTE 350CID power steering Hello Fellow techs, thanks to all that gave advice on this matter. I really appeciate it. Iatn is a great help, the customer was very impressed when I showed him the way It all works and he was very appreciative of my efforts to repair his corvette.Having said...	18
	1992 Chevrolet Astro CL 4.3L MIL Lamp on VIN: 1GNDM15ZXN traced to a bent pronge on the wiring harness plug at the reman ecu. we straightened out the connector and all is fine	9
	1992 Chevrolet G20 Chevy Van 5.7L No Start, Stall VIN: 2GBEG25K5N We replaced the distributor with a known good unit and let the owner drive it for the past week and a half and have not heard back from her so I take it that it is fixed. I do not know why with a new ignition module, pickup coil, distributor shaft this did not...	9
	1997 Chevrolet Camaro Z28 5.7L MIL Lamp on VIN: 2G1FP22P2V sorry so long wanted to be certain of fix. called customer this mouning and all ok. first we really need to do a better job of reading the information supplied. i went to great lengths to state that i verified heater power and ground supplies good at sensor an... Trouble codes: P0135, P0155, P0133, P0153.	9
	2000 Chevrolet Impala LS 3.8L Low Tire Pressure System VIN: 2G1WH55K3Y The tires had been replaced before the problem showed up. I checked the wheel speed sensors on the scanner and all checked good. Reset the moniters for the low tire pressure system, and it seems to be working fine so far. Had 11 very good replies. Most replies...	12
	1989 Oldsmobile Cutlass Supreme International 3.1L No Start, Poor Idle Quality, Cuts out, Stall VIN: 1G3WR14T4K Hi Techs, I received several replies on this problem,some thought it could be the EGR but I had checked that but didn't mention it,some said it could have jumped time so I Comp. checked a couple of cylinders and they were ok,so I was fairly sure that wasn't th...	23
	1996 Pontiac Sunfire SE 2.2L Ignition VIN: 1G2JB5246T First off THANK YOU to all who took the time to reply. This car had some major problems... It turns out it was a repaired car Hit in the right front...HARD. We checked everything finding and repairing corroded wiring where some hack had butt connected wiring b...	10
	1997 Saturn SL1 1.9L Stall VIN: 1G87H8283V i found that when it stalled i had power to the injectors but no ground it was the computer thanks for all the input dave	12
	2000 Saturn LS1 2.2L vtd VIN: 1G8JU52FAY To date this problem continues to be intermitent for this car and has not increased in frequency. One reply said to load test the battery...haven't done this... two said replace the passlock sensor which is part of the column housing, but the problem is so rar...	4

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