GM Automotive Technicians Technical Discussion and Fixes for Jan 19, 2004

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	Help Request	Answers
	1994 Cadillac Seville SLS 4.6L buzzing noise front of motor VIN: 1G6KS52Y6R customer brought car in for replacement of alternator after repair noise still there,noise sounds like it may be comming from behind alternator in the timming chain area.one of our ohter thecs replaced p/s pump,noise has not changed	View
	1988 Chevrolet Celebrity 2.5L Hesitation, Surge, Stall VIN: 1G1AW51R0J Our shop is having trouble pinpointing the root cause of the problem with this vehicle. The problem were having with this vehicle is happening mostly cold, but has a different condition after the engine warms up some. When the eng. is cold and placed in gear, ... Trouble codes: 42 (electronic spark timing problem), 45 (rich exhaust)	View
	1989 Chevrolet C1500 Cheyenne 6.2L Drive Belt VIN: 2GTEC19C7K Hi all, I have this diesel half ton in which the belt runs crooked between the AC compressor and the alternator. So much so that it runs on the extreme outside edge of the tensioner pulley and will even flip the belt off at times. I have replaced the tensioner...	View
	1989 Chevrolet Corvette 5.7L MIL Lamp on VIN: 1G1YY2183K Hey guys, I hope someone has something for me. The vehicle came in a month ago with multiple codes. Code 33-MAF sensor signal voltage high circuit failure and code 36-MAF burn off failure. Mass air flow sensor was replaced and code 33 is gone but code 36 keeps... Trouble codes: 36 (MAF burn off failure)	View
	1994 Chevrolet Corsica 3.1L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire VIN: 1G1LD55M7R Car came in with miss/buck intermitent.one coil pack,all plug wires,ignition module and ecm have been replaced. No codes found.Problem is not always there,miss/buck like it is running on 2-3 cyl when it happens.This happens more often after cold start then sho...	View
	1995 Chevrolet S10 2.2L Coolant Leak VIN: 1GTCS194S8 Evidence of coolant leak under vehicle. Almost a gal. low in 2000 miles. Very hard to see, but appears to be leaking at head gasket at rear of engine. Has this been a problem on these engines, or is there something else that leaks and looks like head gasket? T...	View
	1996 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Misfire VIN: 1GNDT13W3T This S10 Blazer has a dead miss--at least #3 is dead and I think #5 also. The mechanic next to me has over 12 hours in it. Please look at the test results BELOW. Also, all spark plugs have been replaced with the proper ones (they were loose Champions gapped t... Trouble codes: P0300 (random multiple misfire code 3 and 5 are flooding)	View
	1997 Chevrolet Corvette 5.7L codes VIN: 1G1YY22G9V This low mileage C5 came in with a check engine light and I found the codes listed above,for the p1431 fuel level sensor I found the passenger side fuel tank level sending unit would intermittently read empty even if the tank was full,I replaced the fuel level...	View
	1997 Chevrolet Tahoe LS 5.7L Misfire, bucks VIN: 1GNEK13R7V This Tahoe is hard to figure out. If you accel to about 55 or 60 and then let of the gas slightly to maintain speed it will have a bucking sensation just after letting of gas a little. Scanner will show a slight misfire on no one particular cylinder. It will n...	View
	1998 Chevrolet Blazer 4.3L Intake VIN: 1FNDT13W2W This truck came because the customer said it had a radiator leak. We added a gallon of coolant to pressure test the system and found that it was not only leaking from the radiator, but the intake gasket was leaking as well as the water pump. It was too low to ...	View
	1999 Chevrolet Silverado 1500 5.3L loosing coolant VIN: 1GCEC19T4X Found coolant in the engine oil is this common. I have not seen this on a 5.3L. Called some other shops they have not seen it either. What I was wondering should I pull the heads or will this be a waste of time and money because there is a common problem.	View
	1999 GMC Jimmy SL 4.3L transfer case Customer came in with a bad clunk/bang when shifting from 4 hi to 2wd. This is the only time it does it. Doesn't matter how fast or slow you're moving. No codes in the TCCM. The vacuum switch on transfer case was stuck so I replaced it. Still clunks. Tested th...	View
	1989 Oldsmobile Delta 88 Royale 3.8L abs VIN: 1G3HN53C4K Thanks in advance for any help...this olds came in with abs light on steady its a teves system 4 wheel the problem i have is when i jump the aldl i get nine flashes the a pause of a second and then ten flashes then i unground the aldl and get code 36 and 76 .....	View
	1995 Oldsmobile Aurora 4.0L Odometer VIN: 1G3GR62C77 It seems that everything is allright- and when I desactivate the track control switch the speedometer mark the rigth speed, but as soon as the engine is turn-off and re-start the engine again - the computer activates the track control again. When the vehicle ...	View
	2001 Oldsmobile Intrigue GLS 3.5L Check Vehical light & PCS lights on VIN: 1G3WX52H31 I just seem to find then... I have the Snap-on shopkeep system, so my info on this system is limited. At this point i need to idea's as to were to go next. I do not want to just through a 260 dolar sensor in it and then have to then replace the ECBM, and that ...	View
	1997 Pontiac Sunfire SE 2.2L Poor Idle Quality, Stall, lacks power at times VIN: 1G2JB1245V Hi group first time posting. Sure appriciate any help i can get thank you in advance. Customer came to me from a trans shop because of no power in passing gear. I went for a test drive and the car drove perfect of course. I brought it into the shop and checked... Trouble codes: P0171, P1601	View
	2000 Pontiac Firebird Formula 5.7L Hesitation, Misfire, MIL Lamp on VIN: 2G2FV22G5Y when car starts warming up, it intermittently misses on cylinders 2,4,6,8 and runs pretty bad. spark is good, injector balance test showed 10 psi drop on all 8 injectors. now, i found the O2 sensor on bank 1 reading ok, but bank 2 is stuck at 1100mv. i unplugg... Trouble codes: P0300	View
	2001 Pontiac Sunfire SE 2.2L No Start, Stall VIN: 1G2JB52451 Help GM Techs! This car will crank but not start at times esp cold. It also will stallatb times but will restart. I have not made it act up for me but every time the customer gets it back it fails to start(long crank time) and stalls. the only code that I g... Trouble codes: U1000 (crank sensor performance), P0336 (p0340cam sensor), P0341, B00DY, A1R	View
	1997 Saturn SC1 1.9L lock up in 3rd? VIN: 1G8ZF1285V Note this car Had 15 different codes in stored the ranged from check electric system, to voltage to low shift solinoid stuck on removed and retest drove no codes back yet still up shifts fast and than when you get to 40 mph it shifts into 4th with a big drop i...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1989 Cadillac Allante 4.5L consul fuse #8 VIN: 1G6VR3188K Thanks to all who replied. The problem was the BCM was staying 'awake' because there was a ground at connector #1 pin D3 at the BCM. This circut which is a white/green wire and goes to the door key lock cylinders. The problem was someone tied one of the alarm ...	5
	1996 Cadillac DeVille 4.6L starter VIN: 1G6KD52Y4T We ended up pulling the motor and found the center of the flex plate broken out and the outside piece jammed inside the center piece so the vehicle would still start and move but would rub on the rear of the engine and on the starter snout. We pulled the engin...	4
	1990 Chevrolet V1500 Suburban Scottsdale 5.7L speedometer VIN: 1GBEV16K4L Thanks guys for all the help. by the time most of you responded we found the following. took a good drac and tested the outputs with lab scope on a vehicle with no issues. once we acquired the info we transfered the drac to vehicle with issues and looked for t...	4
	1995 Chevrolet Caprice Classic 5.7L Cuts out VIN: 1D1G1BL52P Hellow group, That 95 Caprice we have with the cutting out problem for the first couple of min. of driving(and only on HARD acceleration) has not returned yet. Your help replies sent will be looked into as soon as the customer will let go of it for a day or tw...	9
	1995 Chevrolet Lumina APV 3.8L Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1GNDU06L4S Well customer finally returned almost 4 weeks later, with an apparent problem once again and this time I pulled off the balancer and to my shock there was a piece of serpentine belt wrapped around the crank and was interfering with the crank signal. Just a sma...	14
	1995 Chevrolet Blazer 4.3L Excessive Emissions, Hesitation, Cuts out VIN: 1GNDT13W6S Wow! 46 replies in all and about 98% were dead on. The regulator was spewing fuel. The entire right side of the intake was a clean as it was when it rolled off the assembly line. I had a hard time finding the port to test the fuel pressure mostly because the a...	37
	1995 Chevrolet K1500 Suburban 5.7L cd VIN: 1GFNK16K7S I found the phone number for the GM radio repair shop in my area on Identifix. I called the shop and talked to their tech. We went over what had been done and what the symptoms were. Having no codes except 'Err', he said that probably the only way to see what ...	3
	1996 Chevrolet C1500 Suburban LS 5.7L Misfire, MIL Lamp on VIN: 1GNEC16R3T well for me that was a stumper. thanks to the knowlege of iatn. I found an internal intake manifold leak by blocking off the pcv valve hole , and the breater hole on the valve covers and finding vacuum on the oil dip stick tube. That only took 1 minute to chec... Trouble codes: P0305, P0300.	22
	1997 Chevrolet K1500 4.3L transfer case VIN: 1GCEK19WOV I had to wait for the customer to get the money to continue with this repair. The problem was that the encoder motor didn't seem to know what position it was in. After obtaining a wiring diagram of this system, I retested all of the power and ground feeds. I s...	7
	2003 Chevrolet Avalanche 2500 8.1L drive shaft VIN: 3GNGK23G13 returned vechicle to dealer and tey replaced the transfer case	3
	1996 Oldsmobile Cutlass Ciera 3.1L Valve train VIN: 1G3AJ55MXT I had several replies which I would like to thank very much. The resolve to this car will be new lifters which I pretty much knew but was hoping not. I tried adding GM engine oil suppl. which did help. I feel this is just a band-aid though. The customer is thi...	11
	2001 Oldsmobile Silhouette Premiere 3.4L Poor Idle Quality, Stall VIN: 1GHDX13E81 Finally got to this one again after a week of trying to get it dropped back to me. 7 of 9 responses referred to IAC as most likely culprit. One response reminded me that the push rods are different lengths for intake and exhaust, which I was aware of and marke...	9
	1996 Pontiac Grand Am SE 3.1L No Start, Stall VIN: 1G2NE52M4T The car runs again. I did disconnect the wires that were spliced into the wire harness of the key lock tumbler housing, and did the key re-learn by leaving key in the on position for about 45 minutes. Then shut the key off, turn it on, the theft light was then...	22
	1999 Pontiac Grand Prix GT 3.8L Surge VIN: 1G2WP52K1X Hi iATN I'm sorry to say that I could not fix this one.The Customer had to have his car back the same day so I was unable to continue W/ diag.We sceduled the car twice but nevered showed.All of the replies were very helpful especialy Steve [...] who had the v...	8

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