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Prev Professional Automotive Repair Technical Discussions for March 26, 2008
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Open Help Requests for GM
Help Request Answers
1996 Buick Century Custom 3.1L Misfire VIN: 1G4AG55M5T
Hello all, I'm posting this vehicle for another tech in the shop. The car initially came in for a coolant leak. The lower intake gaskets were replaced, along with a full tune-up and motorvac service (maintanence). The customer drove the vehicle for a day or so... Trouble codes: P0300 (random cylinder misfire)
1990 Cadillac DeVille 4.5L MIL Lamp on VIN: 1G6CD5335L
good afternoon people ,we have a 1990 caddy deville here that has a 49 air management system code ,found that the is debris from the a i r pump vanes inside the management valve that's mounted to the rear valve cover. look's like the pump is still avil but the... Trouble codes: E, 49 (a i r management system problem)
1993 Cadillac DeVille 4.9L Excessive Emissions, Misfire VIN: 1G6CD53B8P
we can't get this cadillac to run right it won't go into closed loop and cylinder #3 and # 8 have miss fires due to fuel (too much) not too sure where to go next on this.
1997 Cadillac Seville STS 4.6L No Start VIN: 1G6KY5298V
Thank you to all in advance. I have problem with this one I just can't figure out. Probably something simple, but my mind is fried. This Cadillac came in a couple of weeks ago with a theft problem. The other tech that worked on it replaced the ignition switch....
1984 Chevrolet Corvette 5.7L brakes locked up
OK people, got one that stumps me. 1984 corvette comes into the shop with a problem with the front brakes slowly locking the car up where the car wont move unitill I release the fluid from the front caliapers. I put brake hoses on but have the same problem. Lo...
1996 Chevrolet K1500 Suburban 5.7L blower motor VIN: 1GNF16R4TJ
I have seen 3 of these trucks-all 1996 model with the same problem over this last winter-the blower resistor burns out due to the fact that the blower motor is frozen!!-The blower cage has ice in it!!-I have contacted a friend at the GM garage and he has never...
1998 Chevrolet Blazer 4.3L Transfer case, Differential VIN: 1GNDT13W1W
Hello! Having trouble with this blazer binding up in 4 wheel drive when turning. When in 2 wheel drive having no problems at all. When in 4 wheel drive and turning it will come to a complete stop, and has trouble moving. I removed both driveshafts and check un...
1999 Chevrolet K1500 Suburban 5.7L No Start VIN: 3GNFK16R8X
ive got a 2000 tahoe in that wont start when cold, its got 55 pound of fuel pressure, good spark, and the injectors are pulsing. no codes. i can spray a little starting fluid in the throttle body and it will start up and run fine. i can shut it off and it'll s...
2000 Chevrolet Blazer LS 4.3L Hesitation, Cuts out, Stall VIN: 1GNDT13W9Y
Blazer only stumbles at wot. You can easy in to it and at 1/2 throttle spins tires. If u wot it will sputter stall backfire what ever u want to call it. I say the pump is bad but it is 300$ so I want to be sure. Fuel pressure koeo 60-59 quickly falls an sta... Trouble codes: P0173, P0151
2000 Chevrolet Impala 3.4L multifunction switch VIN: 2G1WF55E1Y
left interior fuse box was replaced because of a "vehicle no start" turn key to start & got nothing, tap on the fuse box a few times & vehicle would start right up. loose contacts behind fuses. next problem: seems the blinkers do not work at all. when you try ...
2001 Chevrolet Venture LS 3.4L coolant temperature gauge VIN: 1GNDX03E41
Vehicle came in with an erratic coolant temperature gauge, customer said it went into the red once. Otherwise no signs of overheater or coolant loss, etc. Upon inspection, found coolant low. Pressure tested, no leaks found. Tested for blown head gasket with b...
2004 Chevrolet Silverado 1500 5.3L encoder motor VIN: T341367472
just wondering if anyone know how to time the encoder motor gears after you change the position sensor under the gear in the assembly?? any help or diagram would be appreciated
1999 GMC Sierra 1500 SL 4.3L No Start, Cuts out VIN: 1GTEC14W5X
Two weeks ago this truck landed here not running.We pushed it in the shop and quickly found not spark from coil.The tech working on the truck put one on it and it started right up.We sent the costomer on his way the truck was brought back here on a hook 4 days...
2002 Pontiac Grand Am SE1 2.2L Excessive Emissions VIN: 1G2NF52F02
hey guys this car came in running like a lawn mower no miss fire codes or no missfires in data. good fuel pressure 60 psi. no restriction in exaust because i dropped it cat turns cherry red no power almost sounds like it jumped a tooth on the timing chain i ha... Trouble codes: P1171 (cant learn fuel delivery at acceleratio)
2005 Pontiac Sunfire 2.2L Misfire, MIL Lamp on VIN: 3G2JB52F35
car comes in with intermit. miss, mostly under a load miss 1 and 4, sometimes cleans itself up and runs good, suddenly 1 and 4 go nuts like a coil gone bad. tested injectors, control mod, plugs, also put a coil assembly from wrecker and got same symtoms, start... Trouble codes: P0300 (random miss)

Fixes & Summaries for GM
Fix/Summary Answers
1992 Cadillac Fleetwood 4.9L Stall VIN: 1G6CB53B8N
Thankyou to all who replied,those that mentioned the baffles in the tank breaking up hit the nail on the head.A small piece of the baffle was holding up the float telling the gage there was still more fuel.I fished out all the broken pieces and while I had the...
2004 Cadillac Escalade 6.0L radio amplifier VIN: 1GYEK63N24
well with a good wiring diagram from general moptors i was able to determine the amplifier was the actual problem. it had an internal transistor sticking and causing the current draw. thanks to everyone for the help, we did install a new amp and the problem is...
1991 Chevrolet Corsica LT 3.1L No Start, Poor Idle Quality, Cuts out, Stall, MIL Lamp on VIN: 1G1LT53TOM
Thanks to everybody that replied. When you cant find whats wrong, find everything thats right!!! All the sensor readings at the sensors themselves ( ref voltage, signal output, ground) and actual batt voltage at the batt and alt were normal. Ordered another...
1992 Chevrolet K1500 Cheyenne 4.3L Hesitation, Cuts out VIN: 1GCEK14Z0N
First let me thank everyone for their help. Well the culprit was a cracked reluctor ring. I over looked it when I replaced the pickup, but I decided to take a look this morning and there it was. As for the DTC 43, slack in the trans. mount & misfire = DTC 43 I... Trouble codes: 43 (ESC module/Knock Sensor).
1996 Chevrolet C1500 4.3L Cuts out VIN: 2GCEC19W2T
Well this one is fixed and it has a little twist. We got some excellent tips, which included further inspection of the VSS, fuel filter, crank sensor, distributor, ECM flex, ignition coil, premature TCC and harnass problems. Thanks for all your input, but Da...
1997 Chevrolet Venture LS 3.4L Air bag VIN: 1GNDX03E8V
Well, I knew I'd feel silly when I found the problem but I feel really silly. The wire loom runs under the carpet by the park brake pedal. Some time in the past, the holder in the loom was removed, letting the loom rub against a bolt in the floor. I got suspic...
1999 Chevrolet Express 2500 5.7L Excessive Emissions, Hesitation, Cuts out, Poor Fuel Economy VIN: 1GCGG25R8X
Thank you for all your help. Sometimes you do have to go back and check your basics. The idea of using the Motor Vac was excellent. It worked like a charm! The fuel pump was short on volume. Not enough to stall the engine but enough to make it run bad under ... Trouble codes: P0131 (o2 low voltage), P0137 (o2 low voltage), P0151 (o2 low voltage), P0157 (o2 low voltage).
2001 Chevrolet Silverado 2500 HD LS 6.0L posible rear diff VIN: 1GCHK23U11
Even though I have seen a bad u-joint causing a vibration on take off and down the road, I have never seen one that causes the brakes to moan and vibrate when appling the emergency brakes only. Trying more things that can cause a vibration in the rear I pulled...
2006 Chevrolet Impala LS 3.5L Module Connector VIN: 2G1WB58K56
Thank you Wayne, Aran, Larry, and Tom K for the diagrams. What a great resource. The pin locations for the harness connector were the toughest. I'm guessing Aran and Wayne had access to GM's web site. Anyway, 45 splices later and she runs great. Couldn't ...
1994 GMC K3500 Sierra SL 6.5L vss circuit VIN: 1GTHK34FXR
Quentin hit the nail on the head when he mentioned corrosion building up on the VSS bracket between the bracket and the transfer case casting which in turn increased the air gap of the VSS. One little bump with a chisel and off it came. Road test verified cond...
1996 Pontiac Grand Am SE 2.4L No Start VIN: 1G2NE552T7
Thanks to all 20 that replied. Many people thought the exhaust might be plugged. This turned out to be the problem. The car had spark, fuel, compression, but would not run at all. I thought the valve timing was off, but as many of you suggested, I removed the ... Trouble codes: P0300 (interm misfire).
1997 Pontiac Trans Sport 3.4L Wheel Cylinders VIN: 1GMDX03E7V
Thank you all for the replies. initially when I did the brake service I bled out about an ounce from each corner(aswell as draining the calipers when servicing the front). The fluid was a nice gold color and still was now. Raybestos have been great to me and...
2000 Pontiac Montana 3.4L Wipers VIN: 1GMDXO3E6Y
Im having a tough time getting either of these vehicles back to the shop-Most replies are very accurate im sure so anybody with this problem will find this helpful in the archive section.When I get them back Ill be sure to update the fix.Thanks again guys sw...
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