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Prev Professional Automotive Repair Technical Discussions for November 23, 2005
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Open Help Requests for GM
Help Request Answers
1995 Buick Regal 3.8L timing chain VIN: 2G4WB12L3S
Greetings, Servicing t-chain on 3.8l VIN L. Napa's tchain set has cam sensor about 15-30 degrees off. Is this OK because of the crank relearn procedure? Has anyone installed a set like this? note this is the motor with a balance shaft. Napa does not show a VIN...
1996 Buick LeSabre Custom 3.8L No Start, Cuts out, Stall VIN: 1G4HP52KXT
first time this car showed up on hook no start, found no fuel preasure. replaced fuel pump with after market , three weeks later on hook again, replaced with same manufacturer, never left shop, installed new ac delco pump, three weeks later on the hook again. ...
2002 Buick Rendezvous CX 3.4L rear defroster VIN: 3G5DB03E12
Vehicle came in no rear defrost. after reattaching tab found no power to grid. found fuse to relay good. alldata does not show on relay where actuation power and ground come to relay, and we have no power or ground to relay other than fused power from 60amp fu...
1980 Cadillac Eldorado 5.7L Excessive Emissions, Stall, FLOODS VIN: 6L578AE651
help-have an older cadillac eldo with early fuel injection that refuses to be fixed!!1980 with 350 mpi.this system fires one bank of injectors at a time by a signal from reed switches in dist.to ecm.problem is running too rich when warm,to the point of dying.s...
1996 Cadillac Seville STS 4.6L Lighting VIN: 1G6KY5293T
Weird one here guys!!. The turn signal on the left side is fine. The problem is the right turn signal works intermittenly, but right now it's dead. It does not blink or even comes on,Now for the Kicker, sometimes will work fine and when you turn the parking li...
2000 Chevrolet Silverado 2500 6.0L transfercase VIN: 1GCGK24U2Y
This vehicle has a manual engagement transfercase. When put into 4x4 the vehicle will intermittantly slip out of four wheel drive. Is there any history on this happining?
2000 Chevrolet Express 2500 5.0L Misfire VIN: 1GCFG25M0Y
Hello all and thanks for the help. I have this van here with a misfire on #3 and #5. No spark on these 2 cylinders. Tune up parts were all original, distributor cap showed signs of carbon tracking, so I replaced plugs, cap, rotor and wires. Still no spark on 3... Trouble codes: P0300 (Random cylinder misfire)
1997 GMC Jimmy SL 4.3L 3-2 shift P0785 VIN: 1GKDT13WXV
Hi Group, This vehicle has an intermittent Service Engine light with a stored P0785, when this occurs it has 3rd gear starts. Usually occurs after a cold start with short trips around town. Connections have been checked on the transmission and pcm. Grounds hav...
1999 Oldsmobile Bravada 4.3L Cuts out VIN: 1GHDT13W7X
Hi everyone' I have a customer with a low mile Bravada, that will randomly cut out. Sometimes it completly stalls. When the problem occurs the tach in the dash will peg to 6000 RPMs and the engine will cut out as though the rev limiter is taking over and shut...
1993 Pontiac Trans Sport 3.8L MIL Lamp on, A/C malfunction VIN: 1GMDU06L4P
The code numbers are correct, I'm pretty sure the titles are also. Vehicle is at work, I am home at 12:30 A.M., so please have mercy!! It came in for check engine light. 25 was the only one in "history codes". It was also in current codes along with the others... Trouble codes: 25 (MAT too high), 65 (cruise control servo position sensor), 66 (A/C pressure), 69 (high pressure switch circuit), 88 (PCM reset), 99 (power management problem)
1993 Pontiac Bonneville SE 3.8L rear defogger VIN: 1G2HX53L6P
The rear window defogger does not work. Checked the fuse- ok. The light does not come on. Shop Key [Mitchell] says the relay is in the relay center. We cannot find it there. Does anyone know where the relay actually is? Happy Thanksgiving to everyone!

Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick Park Avenue 3.8L Poor Fuel Economy VIN: 1G4CW54K71
I think I may have solved the problem. I always clean the MAF sensor at a tune up. I use brake cleaner and that usually does the trick. Well, as a guess I replaced the MAF with a known good part and my fuel trims fell into acceptable range. They had been aroun...
1993 Cadillac DeVille 4.9L whole car VIN: 1G6CD53B8P
the customer had both a new set of tires put on and came back to me where i replaced both axles again - problem never changed - hes FINALLY satisfied that my work is fine - so its unfortunate that the problem was not resolved but atleast its out of my hair - t...
1995 Cadillac DeVille Concours 4.6L No Start VIN: 1G6KF52Y3S
All info I recieved was good, but none helped with repair. Vehical still has a cel on and only 1 crank sensor hooked up. Vehical does run great. I want to thank all who sent help. Trouble codes: P0083.
1997 Cadillac Catera 3.0L piston VIN: WO6VR52R5V
Ok I have heard and see a lot in over 20 years of this. The warranty company called this AM and wanted a price to replace the # 5 bearing and rod. When I asked about the crank, head, and block damage they informed me THAT IS CONTINUOUS DAMAGE AND WE DON'T WARR...
1990 Chevrolet G30 Sportvan 7.4L Poor Idle Quality, Hesitation, Rough Cold Start VIN: 2GBGG39N6L
Sorry for the delay in the so-called fix. We found that the complete Throttle body unit is at fault. The fuel pressure reg is leaking, the throttle bodies are worn & the IAC is not functioning properly but only for about 30 seconds. Then everything clears up. ...
1990 Chevrolet G30 Hi-Cube 5.7L overheats Exh manifo VIN: 2GBJG31KXL
Thank You Gentlemen, The van from hell is out of here. I had a lot of suggestions but I didn't get the answer. Most suggested timing. Timing was on , fuel pressure and volume was good. I replaced the fuel injectors and all is resolved. Thanks to all that too...
1995 Chevrolet K1500 Suburban 5.7L engine temp VIN: 1GNFK16K35
Well so far so good- the only thing we could figure was the gauge was not accurate so we put a 50 ohm resistor in line that way the gauge would still go full hot when grounded and turn the check gauges light on we had already tried the 100 ohm but the gauge wo...
1997 Chevrolet Express 2500 5.0L Lifters VIN: 1GTFG25M8V
With all the replies I decided to replace manifold gasket and went ahead and replaced all the lifters. The customer says that it seems to be okay now. He is going out of state for the holidays so van will get better workout on the trip. Then he will let me kno...
1997 Chevrolet K1500 Cheyenne 5.7L 1-2 Shift VIN: 2GCEK19R7V
Thanks to all of you that took time to reply. Many good suggestions. Since the problem was seldom present when I had the truck in the shop I had to fix it using clues rather than testing for a failed part. Several of you said that there are issues with the sna...
1998 Chevrolet C1500 Cheyenne 5.7L No Start VIN: 2GCEC19R0W
It seems that the generic Snap On scanner does not give the correct info on theft systems. I had to purchase a new Tech 2 to get the proper info, which turned out to be a 2958 code. Replaced the module under the dash because it tested bad, then re-flashed the ... Trouble codes: 1631 (Theft system password incorrect).
1998 Chevrolet Cavalier 2.4L Dome Light VIN: 1G1JF82TOW
Hi and thanks for all the great replies. I haven`t gotten car back yet because I was doing this research to ID problem and since I have already checked door switches fully I will now be more confident to Suggest module replacement, but as car has been hit a fe...
2000 Chevrolet Silverado 1500 5.3L abs light VIN: 3491YE6398
hey the customer had a aftermarket programmer installed on the truck.but the strange thing is he had it done acouple of months ago he did it himself.So this morning he brought the programmer and i set back every thing stock drove the truck and the light stayed...
2001 Chevrolet Prizm 1.8L Time chain/#1 Cylinder VIN: 1Y1SK52851
I would like to thank you all for your responces. The proublem was the #1 wrist pen. I had to pull pan and crank out. I noted some bearing wear that let me know I was on the right track. Customer is now replacing the engine. I hate to gamble with my own labor ...
2001 Chevrolet Impala LS 3.8L No Start, security light on VIN: 2G1WH55K31
thanks for all the information. I finally convinced the car owner that the car must go to the dealer to be fixed. All aftermarket sources were unable to help also thanks again all !!! mitch
2001 Chevrolet Silverado 1500 5.3L Surge, Misfire VIN: 2GCEK19T81
I have not fixed this vehicle. The torque converter slippage is a little high and that may be part of the problem at speed, but I may have two problems. The customer does not want to spend any more time on this problem as he has driven it this way for quite so...
1978 GMC C25 7.4L fuel gauge VIN: TCS248F730
WITH THE WIRING DIAGRAM HIGHLANDER SUPPLIED, I Ws able to locate a broken tan wire at the instrument cluster connection. thanks to all who replied, lots of good help.
1998 GMC Jimmy Envoy 4.3L HID Headlamps VIN: 1GKDT13W0W
First of all thank you all for the help...as I found out the next day, my wiring diagram was way off. I have no idea where these wire colors came from in Alldata and Mitchell but they were wrong. I ended up tracing the wires from the high beam switch and found...
2002 GMC Envoy SLE 4.2L No Start, Stall VIN: 1GKDT13S12
after all the testing, replaced fuel pump, ignition switch and fuel filter. drained out fuel tank, fuel was not flammable. customer got a bad tank of fuel. filled truck with fresh gas. thanks for all the help. Trouble codes: P0171, P1275 (aap sensor 1 ckt problem), P1271 (aap sensor 1-2 correctional error).
2001 Oldsmobile Alero GL 3.4L No Start VIN: 1G3NL52EX1
vehicle has surpassed our ability and was suggested return to dealer un repaired Those who read our request and responded with information pertaining to passlock 1 system should realize passlock 2 is alltogether different One response asked information the was...
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