GM Automotive Technicians Technical Discussion and Fixes for Jul 12, 2004 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1986 Cadillac Eldorado 4.1L Excessive Emissions, low power VIN: 1G6EL5780G Car will run fine on open highway until you come to hill & try to accellerate, loses power, black smoke, goes into open loop, 9mv on o2 because of open loop (only goes into open loop because of keeping foot into it). Have replaced map sensor & fuel pressure re...	View
	1998 Cadillac DeVille 4.6L abs and traction control lites VIN: 1G6KD544XW abs and traction control lites are on. code # 1227 left rear excessive wheel speed variation. found no obvious problems but repaced wheel speed/hub assembly at that time because of pattern failures on past cars. also checked wiring, connectors and sub harness ...	View
	1999 Cadillac Seville SLS 4.6L Vibration VIN: 1G6K45491X Hello Cadillac Techs I have a Seville that has a moderate vibration only on deceleration. The car must be traveling 67 mph or faster to vibrate, if the brakes are applied or if the throttle is increased the vibration goes away. There is a TSB regarding a vibr...	View
	1990 Chevrolet BOUNDER 7.4L power steering VIN: 1GBKP37N8L this motorhome came in from another shop . the power steering pump is very noisy and fluid leaks out of resvoir through the cap,the pump has been replaced with a gm pump,when you drive down the road fluid is forced out of the resvoir, this motorhome is equipt ...	View
	1993 Chevrolet motorhome 454CID p/s pump VIN: 1GBKP37N33 Went thru GMs manual on bleeding the system.Got a lot of air. Noise goes away until you bring the rpms up and apply the brakes or turn the steering wheel. Rebleed the system and the air is there again. There are no external fluid leaks at all. I have worked on...	View
	1993 Chevrolet Astro CL 4.3L #6 cylinder dead VIN: 1GNEL19W8P Good afternoon everyone. We have a real brain teaser on our hands. We have a dead miss on cylinder #6. As you can see we have fuel, spark, compression and still #6 cylinder when shorted out makes no difference. When we apply the brake pedal makes stumble worse	View
	1996 Chevrolet C1500 Cheyenne 5.7L Poor Idle Quality, MIL Lamp on, Transmission slips VIN: 2GCEC19R5T We replaced the intake gasket for a coolant leak. Reinstalled everything and resynced Cam and crank together by procedures. Test drove home over night and returned to customer with no problem. 2 days afterwards came back to shop with Mil Lamp on with codes p01... Trouble codes: P0108 (MAP Sensor Circuit too high), P1106	View
	2001 Chevrolet Silverado 2500 6.0L codes VIN: 1GCGK29UO1 dont have much info on this the code is co265 ebcm relay circut. the problem is intermittent the code sets about every 30 miles or so. I checked connections at the ebcm and checked voltage on the motor connector and its ok. thanks for any help	View
	2001 Chevrolet Suburban 1500 5.3L compressor VIN: 3GNFK16T11 This vehicle came into us last friday with a broken AC belt. This 5.3 engine has a seperate AC compressor belt with it's own tensioner. we replaced the tensioner & belt because the tensioner has excessive side to side play. vehicle came back today with another...	View
	1997 GMC Jimmy SL 4.3L MIL Lamp on, trans complaints VIN: 1GKDT13W0V This vehicle came into the shop with complaints of the transmission slipping under moderate acceleration. Also he says the oil pressure gage is reading unusually high. Upon initial test drive without scanner noticed shift points were high, hard, and never the ... Trouble codes: P1406, P0122, P1122	View
	1999 GMC Savana 3500 5.7L drivers front VIN: 1GTHG35R7X One of our fleet accounts (of course the owner of the comany) is having trouble with his drivers side power window. We replaced the power window regulator a couple of years ago. Afterwards he brought the vehicle back for a noise from the window about 3" from t...	View
	1989 Oldsmobile Cutlass Calais 2.3L Misfire VIN: 1G3NK14AXM This car was brought in with a dead miss. The owner said it happened while driving and has not change since the onset. We started with a comp test and all cylinders were even at 170 psi. We checked the injectors for firing with a noid light. We than removed th...	View
	1996 Oldsmobile Cutlass Supreme 3.1L Misfire this car will intermitently miss and mil will flash when ever it feels like it. i have checked the crank sensors the cam sens. the ign. module the coil packs. in history codes no.6cyl has missed 63000 times somtimes others have missed but only a few and not al... Trouble codes: P0300	View
	1993 Pontiac Grand Am SE 3.3L Cuts out VIN: 1G2NE54NBP the MAF has 6.2v at atart as the engine warms up the voltage drops to 5.3. I can't seem to figure this out. the timing being at 86bdc can't be right. The engine runs fair until it gets up to 55 mph then it feels like it has a governor at 55mph. I have checked ...	View
	1997 Pontiac Bonneville SE 3.8L Surge VIN: G2HX52K8VH Ive been studing this car for a couple weeks mainly because its hard to duplicate the problem. what it will do is get a steady surge right around 50- miles per hour on the getting on the freeway .I hooked my master tech up to to watch the torque converter clut...	View
	2001 Pontiac Bonneville SLE 3.8L control head VIN: 1G2HY54K21 Hello everyone I have a car in that the control unit for the ac does not light up, and none of the functions work either. It blows cold air but only out of defrost. The control unit has been replaced, I checked for power at the control head and it only has hal...	View
	1995 Saturn SL1 1.9L Oil Leak VIN: 1G8ZG528XS There is a definite oil leak coming from the intake nut/stud on # 1 cyl. We removed timing cover to inspect the timing tensioner bolt as per the situation mentioned by the post of John Fears on 01/01/2002. I realize his was a DOHC and ours here at the shop is ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1992 Buick Riviera Luxury 3.8L air bag VIN: 1G4EZ13L9N relacment derm was defective and would set a code 41 after 14 min of run time,,replaced derm with another and ran 2 redundant grounds frm term b1 and b12 from derm,,problem solved	4
	2002 Buick Century Custom 3.1L Unknown VIN: 2G4WS52J52 Sorry, no fix on this one, but no reoccurence either. Thanks to the three that replied. One suggested to validate problem, but it only occured for her one time. The other two replies were to check the PRNDL switch, and the other to check the ECM. If I get any ...	3
	1998 Cadillac Catera 3.0L Misfire VIN: W06VR52R8W thanks for all your help the fix for this car was the ignition coil pack	5
	1988 Chevrolet Camaro 5.0L MIL Lamp on, CODE 32 STORED VIN: 1G1FP31EXJ first of all i would like to thank EVERYONE for their quick replys-all contained important areas to investigate to confirm the cause of this problem-i was blown away by the input and knowledge on a 16yr old vehicle!however this vehicle is back for a more impor... Trouble codes: 32 (egr system fault).	17
	1993 Chevrolet C1500 Cheyenne 4.3L Excessive Emissions, Poor Fuel Economy VIN: 1GCDC14Z5P further checking of the heater circuit found that the fuse for the 4wd was acutally missing - after putting the fuse in the system went into closed loop and worked well. reading at idle hc - 59 from 311 co - .68 from .85 cruise hc 35 from 112 co - .18 from .85...	4
	1996 Chevrolet Cavalier 2.2L theft system VIN: 1G1JC1241T I wish to thank Joe [...] especially sent me a great deal of info including diagnostic info on this system and detailed diagrams. There were 2 maj...	6
	1997 Chevrolet Camaro Z28 5.7L water pump drive VIN: 2G1FP22P6V Sorry for the late post. Had alot of responses on this one. First off the water pump drive shaft (the one coming out of the front cover) does have play in it. I had alot of conflicting opinions on this one, so against my best judgement tore the thing down. Bes...	12
	1999 Chevrolet Corvette 5.7L dic VIN: 1G1YY22GOX The fix was to replace the faulty battery. During cranking, the voltage would drop low enough to reset the DIC memory. This car was taken out of winter storage late, and I had charged and checked the battery about 2 weeks prior to this problem happening (ok ...	3
	1999 Chevrolet Express 3500 LS 5.7L pad wear VIN: 1GAHG39R6X Dear Brothers in arms; I thank each of you who responded to my query. I am closing this request but in reality I will not know if I've made a difference for another 15,000 miles or so. As per some of your suggestions, I've checked to make sure that the rear br...	12
	2001 Chevrolet Silverado 3500 6.6L reverse VIN: 1GCJK33191 3 out of the 5 replies said to replace the prndl switch. when the problem occured the indicator on the dash read correct and the only code was 847 for shift solenoid 'd'. since no problem with the prndl was indicated i did not feel this would correct the probl...	8
	1994 GMC Yukon 5.7L Poor Idle Quality, Hesitation, Stall VIN: 1DAEK18KAR Well just wanted to thank you for all your replies again, checked into the distributor and the magnets were really cracked, visible to a naked eye. Talked to the owner and told him about it and recomended a new Distributor and said that it may not work, but th...	12
	1980 Oldsmobile Cutlass 3.8L Radiator VIN: 3R47AAR450 First I would like to thank everyone for there great replys, to many to name them all. I'm sorry it took so long to post the fix but as this was my sons car I was only able to work on it on the weekends. After perssure testing with my recycle machine, ( pressu...	18
	1992 Oldsmobile 88 Royale 3.8L pass keyII VIN: 1G3HN53L6N Thanx to all who responded(Esp. Rick [...]).Fix was to locate 2 small white wires in an orange harness,cut and solder in resistor.Radio shack was very helpful,also.we measured key resistance,and came up with 1.126K ohm. Radio shack sold me (2) 2.2 k ohm resi...	11
	1992 Pontiac Sunbird LE Value Leader 2.0L alternator VIN: 1G2JC14H8N well, a thanks to everyone who replied. the customer regretfully took the car before i had a chance to check such things as coolant gain and alt running temp. i am also very suspicious of an intermittant draw. after the weekend that the request was posted the ...	10

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