GM Automotive Technicians Technical Discussion and Fixes for Mar 5, 2008

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Open Help Requests for GM

	Help Request	Answers
	1998 Buick Regal LS 3.8L right front VIN: 2G4WB52K5W This regal has us stumped. When turning right (only right)there is a noise that sounds like a screw driver bouncing off of bicycle spokes. We replaced a bad right front hub assembly that was no help. We even swapped the right and left hubs just to see what wou...	View
	1991 Cadillac Fleetwood 4.9L ABS Braking VIN: 1G6CB53B3M We Verified Customer Complaint. Car Has New Front Pads, Rotors & Rear Brake Shoes, Hold Down Springs And Self Adjusters. It Had Mutiple ABS Codes. 61 Pump Motor Test problem, 45 Left Front Solenoid Or Inlet Valve Circuit Fault, 31 Right Rear Wheel Speed Sensor...	View
	1993 Cadillac Eldorado Touring 4.6L Poor Idle Quality, Misfire, BACKFIRE VIN: 1G6EL1291P This cadillac will intermittantly on start up backfire very badly. When it does that it will misfire severly until the engine is shut down and restarted. It seems to do this more after a hot soak. I have only got it to act up once. The fuel pressure holds well...	View
	1998 Cadillac DeVille 4.6L Starting VIN: 1G6KD4Y9WU after replacing pcm now vehicle doesnt start. code p0603. instrument cluster showers vehicle may not restart. performed the 10min leave key on cycle according to alldata. still no start any help would be appreciated	View
	2003 Cadillac CTS 3.2L MIL Lamp on VIN: 1G6DM57N93 we installed a new dealer stat about 300 miles ago and same code has come back and curious if any others have run into this problem...also the cooling fans are not running all the time that i noticed since it came in thanks for any help.. Trouble codes: P0128 (coolant temp below t-stat regulating temp)	View
	1985 Chevrolet Camaro Berlinetta 5.0L Hesitation, MIL Lamp on VIN: G1FP8741FN came in on tow truck would not start plugs fuel fouled. when cranking I found timing about 4 degrees retarded pulled dist. IT checked ok replace cap,rotor and plugs. now it starts and runs ok. the timing is not being controled by ecm. mil is on but wont recogn...	View
	1995 Chevrolet Monte Carlo LS 3.1L MIL Lamp on VIN: 261WW12M3S Hi all, We have a 1995 Monte Carlo came in last fall with the check engine light on(Code 77, EGR solenoid #3) After inpsecting and cleaning the system, we found nothing else wrong and replaced the valve with an ACDelco unit. The light was off for two months... Trouble codes: 77 (egr solenoid 3)	View
	1996 Chevrolet Tahoe 5.7L transfercase VIN: 2GNEK18R0T Complaint is a loud snapping noise in reverse with wheel turned to right in 4 wheel high.The rear diff. is non locking.We checked that all tires were the same size.Pulled the tail off the transfer case to check that the snap ring was not broken,its ok.Removed ...	View
	1998 Chevrolet K3500 Cheyenne 5.7L Poor Idle Quality, MIL Lamp on VIN: 1GCHK34R6W Hey there guys, This Chevy came in about a month ago for the same trouble codes. We disassembled the intake and found the fuel injector "spider" assembly leaking you know the usual common problem. We installed an aftermarket assembly,changed the oil and sent t... Trouble codes: P0172, P0175	View
	1998 Chevrolet C3500 Cheyenne 7.4L fuel guage VIN: 1GDKC34J1W fuel contol module problem.gas guage not working,still pumps out of rear tank sometimes,most items have been replaced more then once,the control module has had a new connector put on it,we have searched tech bulletins and found no help.if you can help find a n...	View
	2004 Chevrolet Silverado 2500 HD 8.1L driver info. center VIN: 1GCHK23G54 i hunted down all the wiring from the switch in the steering wheel to the cluster and could see the voltage drop when i pushed the button , as in the message was sent from the switch but never recieved by the cluster. at this point i am stuck and need some ide...	View
	1996 GMC K1500 Suburban 5.7L MIL Lamp on VIN: 3GKFK16R8T This rig came in with the above code and we replaced the sensor B2S2. Took on a test drive with scanner attached and the sensor reads low a lot of the time. On Highway cruise, it will mimic B1S2 and stay around .68-.720 v but in town while the B1S2 sensor will... Trouble codes: P0157 (O2 B2S2 low voltage reading)	View
	2004 GMC Yukon XL 1500 Denali 6.0L Hesitation VIN: 1GKFK66U44 customer complains of int hesitation that will last for 4-[...]. while driving truck i duplicated the problem one time. it feelslike a dead spot on the tps. this is a throttle by wire. the app and tps did not drop out on the scanner. un fortunately it only ...	View
	1995 Oldsmobile Cutlass Ciera 3.1L service engine soon VIN: 1G3AJ55M05 hello please any help or info will be appreciated.this vehicle keeps setiing egr solenoid error codes. have replaced egr valve with several others, still same problem.this egr valve has 4 wires i have 12 volts on one wire and the other 3 go to the computer , w... Trouble codes: 1405 (egr solenoid error)	View
	1993 Pontiac Grand Am SE 3.3L gas in oil VIN: 1G2NE54N2P car came to us after another shop. complaint is gas in oil. we originally found bad o2 sensor - stuck lean when hot - replaced. car runs well and new o2 sensor reads good, lots of cross counts, changed oil. delivered car yesterday morning. comes back today wit...	View
	1996 Pontiac Sunfire GT 2.4L radio VIN: 3G2JD12T1T this is my wifes car the light in the radio that lights up the clock and channel display is burnt out i removed the front plate and soldered in an led but it barely lights up i wonder if anyone knows the voltage of the bulb or has a part # foe the bulb otherwi...	View
	1999 Pontiac Grand Am SE 3.4L Steering VIN: 1G2NE52E1X My problem is with the variable effort power steering on this car. I am unfamiliar with this system. The complaint is that there is not enough steering assist at low speeds. Before bringing the car to me the customer replaced the power steering pump with a reb...	View
	2001 Saturn LW300 3.0L odometer VIN: 1G8JW84R71 hello all well this saturn reads 694978 on odometer and thirteen miles less on the body control module with the modis we have no codes odometer is not recording mileage and niether is the bcm speed sensors and speedometer are working we have no problems with h...	View
	2004 Saturn Vue Red Line 3.5L Misfire VIN: 5GZCZ63454 We've got a 2004 Saturn Vue that has an intermitent skip on multiple cylinders but mostly occurs on cyl #2. At times it will run great and other times it will have a major skip. We've swapped coils with a good cyl. but the skip stayed on cylinder #2. Also, som... Trouble codes: P0300 (Multiple Misfire), P0301 (Cyl 1 Misfire), P0302 (Cyl 2 Misfire), P0304 (Cyl 4 Misfire), P0305 (Cyl 5 Misfire)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1990 Cadillac Brougham 5.7L Stall VIN: 1G6DW5476L well after some testing found the distributor to be faulty replaced it as a complete assembly and all is well thanks to all that replied	14
	1991 Cadillac DeVille 4.9L hood cable VIN: 1G6D53B8M4 First thanx for all the replies. I did try the coat hanger with a hook but it would just straighten out. The latch was binding. The cable broke at the very end tip by the latch so grabbing it further back did not work either. So I cheated. With the customer...	9
	1996 Cadillac Seville SLS 4.6L valve covers VIN: 1G6KS52Y4T So many of you indicated that problem was in pcv system and excessive crankcase pressure.After a very intense check of system we found that the passages in the throttle body were blocked. Someone had made their own throttle body gasket and did not cut out the ...	14
	1999 Cadillac Escalade 5.7L Shutter over 55 VIN: 1GYEK13R4X All injectors where off. 1 & 3 2 & 4 5 & 7 6 & 8 were all crossed. Who ever did the intake gasket realy screwed things up. The problem is now fixed and I would like to thank all who sent in replies. thanks agian everyone. Trouble codes: P0405.	3
	1992 Chevrolet Lumina Euro 3.1L Poor Idle Quality VIN: 2G1WN54T9N Hey guys-thank you for all of the responses-a lot of you suggested the lower intake could be sucking air internally-I took the filler cap off to check for vacume-couldnt really feal anything-pulled dip stick and still nothing for sure-after tapping on comp-wig...	22
	1997 Chevrolet S10 LS 4.3L ig key cyl VIN: 1GCDT19X2V WOW! This thing kicked my but. If only I had a wiring diagram I could have saved tons of time. Thanks to laneard from Texas he hit the nail on the head there was a broken wire at the shift lock sw on the floor shifter. It was a yellow wire that none of the ele...	4
	1997 Chevrolet C3500 Cheyenne 5.7L brake pedal VIN: 1GCHC33R1V well, as it turns out the hcu we installed was the cause of the low pedal. internal problem and a slight external leak that i didnt catch on initial inspection. the cause of the slow pedal return ended up being dirty p/s fluid. customer replaced p/s pump and p...	10
	2002 Chevrolet Express 2500 5.0L Cuts out, blows fuse VIN: 1GCFG25MU2 Hi: This one is fixed. We had some very good suggestions on places that this circuit can fail. The problem areas are rub thrus at the left front control arm,transmission area and if equiped with oil pressure cut off(which may not show up in the wiring diagra...	11
	1998 GMC Jimmy Envoy 4.3L security system VIN: 1GKDT13W6W I checked the bcm with another know good one from another car and made no differece, we also checked the wiring from the bcm to the ign tumbler and all were good the only thing left was a short in the wiring from some where else in the blazer that ran to the b...	7
	2003 GMC Savana 2500 4.8L Misfire VIN: 1G2GG25V43 we did fix this on our own after some time and wasted time --with the computer codes picking up a misfire -did not roadtest because it was in last week for a coil pack and plug -we then install 8 new plugs and wires , before the road test --it had no power an... Trouble codes: 300 (multiple misfire).	5
	1987 Oldsmobile Cutlass Ciera Brougham 3.8L MIL Lamp on VIN: 1G3AM5137H Everyone had great ideas on what the problem could be, it turned out to be a faulty solenoid. It would switch and send vacum to the egr, Pin c has 12v with key on. egr off. when the solenoid closes (egr opens) pin c should lose voltage. the computer looks for ... Trouble codes: 32 (e.g.r).	7
	1999 Oldsmobile Alero GL 2.4L wiring ? VIN: 1G3NL52T5X Thank you all who responded - the answer was water intrusion. Upon further investigation we found the whole fuse box on drivers side with a large amount of moisture. We removed the box and let it dry out over a heater overnight. We reinstalled box and all prob...	7
	1999 Oldsmobile Alero GL 2.4L front end VIN: 1G3NL12TXC Well my fellow techs, this is fixed but it came with a little help from a friend of mine that owns a tranny shop. Apparently there is a chain on these vehicles that drives the torque converter from the engine. It so happens that this chain developed enough sla...	16
	1999 Pontiac Grand Am SE 2.4L Misfire, MIL Lamp on VIN: 1G2NE52T7X Had a couple of replies to check exhaust restriction – we had, it was minimal. We were not able to get the car back for a few days, when it came back she said she had not added any coolant between visits. We found the coolant level where we had left it, no mea...	5
	2004 Pontiac Grand Am SE1 3.4L not sure VIN: 1G2NF52E64 Thank you very much to the 15 Techs that took time out of their busy schedules to offer help. Sorrt this rely took so long the young lady took the vehicle to Baltimore for a family get together. 5 Techs said either/or the hazzard flasher switch or the turn sig...	15
	1997 Saturn SW2 1.9L ignition switch VIN: 1G8ZK8279V thank you as always for the help. everybody agreed that this switch was just plug and play and it was. we installed the new switch today without any complications. no programming or relearn was required. we did not replace the key and tumblers only the electri...	10

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