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Prev Professional Automotive Repair Technical Discussions for December 28, 2004
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Open Help Requests for GM
Help Request Answers
1985 Cadillac DeVille 4.1L rear drum brakes VIN: 1G6CD478OF
We've preformed the above listed work on this vehicle; the rear brakes continue to lockup on slightly more than normal braking. All parts are aftermarket; we've gone back and substituted other (new/original) pieces to isolate the problem, and swapped parts rig...
1989 Chevrolet Blazer Silverado 5.7L Excessive Emissions VIN: 1GNEV18K0K
hi guys , happy holidays little blast from the past,,,full size blazer 5.7l tbi, is giving me , a whooping ,,first off towed in, running like dog, misfiring , black smoke ,,,you name it it was doing it,,,look over veh, many problems , full rich due to rotten o...
1993 Chevrolet S10 Blazer Tahoe 4.3L Poor Idle Quality, Surge, Stall VIN: 1GNCS13W9P
Hello Fellow Techs. Todays diagnostic dilemma comes from a 1993 Chevy Blazer with a Vortec 4.3liter Engine. Customer brought the vehicle in complaining of a rough running/stalling condition. Upon initial inspection of the vehicle it was found that to be runni...
1994 Chevrolet Cavalier RS 2.2L No Start VIN: 1G1JC1448R
Thank's in advance for your help. I have this 94 Chevrolet Cavalier that will not start. Replaced fuel pump got good fuel pressure. Changed spark plugs, were fouled and soaked with fuel. Checked compression and all were 120psi. to 140psi. Changed oil, it had a...
1997 Chevrolet Camaro 3.8L Mechanical VIN: 2G1FP22K8V
thanks to who replies to this,we have a camaro that keeps blowing the oil filter gasket from to much pressure.The car has a rattle noise when we crank it but cant let it run long enough to determine if its rods lifters etc.If we had a bearing problem wouldnt w...
1997 Chevrolet Malibu 3.1L Misfire, MIL Lamp on VIN: 1G1ND52M8V
Hello Techs, This car came in with the MIL light on (Not Flashing) and a slight miss. Check the codes and noticed the mentioned random miss code P0300. The scanner shows a miss history on #3 cyl of around 2500 and on #1 cyl of 8. But it is not missing regular... Trouble codes: P0300 (Random misfire)
1998 Chevrolet K1500 Cheyenne 5.7L Excessive Emissions, Misfire, Poor Fuel Economy VIN: 1GCEK19R4W
I need your help on this one. Came in with fuel leaking out of right exhaust manifold. Pulled all of the spark plugs. #6 plug fuel soaked. Scanned truck, #6 cyl misfire. Pulled upper intake and inspected #6 injector/poppet unit. It was all wet and fueled soake...
1998 Chevrolet K1500 Cheyenne 5.7L Poor performance VIN: 1GCEK19R7W
Under hard acceleration this truck will not accelerate past 3000 rpm in gear, acts like it is really working hard to get there. Under light acceleration it will go up to 4500 rpm. I can replicate the problem in the shop, only the rpm will go up to 3800 rpm und...
1999 Chevrolet C2500 5.7L MIL Lamp on VIN: 1GBGC24R2X
no data at dl connector checked all fuses and ground wires
2000 Chevrolet Camaro 5.7L Mechanical VIN: 2G1EFP22G0
TRANSMISSION IS A T-56 6SP MANUAL . Will not go into 5th gear at all at lower speeds, say 35mph, problem occured twice at highway speeds upshifting and down shifting. CLUTCH ACTION IS GOOD AND ALL OTHER GEARS WORK NORMAL. Am not getting complete gear engagemen...
1990 Geo Prizm 1.6L Transmission
Sorry I don't have the vin, right now I am at home and this thing is keeping me awake. I replaced the trans with a used unit and while test drivingeverything was going fine until I decided to check and see if it would downshift properly. Well it did downshift ...
2001 GMC Savana 1500 5.7L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1GDFG15R91
I'll start from the beginning. Customer stated the vehicle ran out of fuel. After refueling, the van started running poorly. Another shop replaced plugs and wires. Same problem. The van came to me with the doghouse off and new wires and plugs.I removed dist ca...
1992 Oldsmobile 88 Royale 3.8L cooling fans VIN: 1G3HY5316N
Fellow techs, Check engine light is on. Retrieved code 15 (coolant temp. sensor low input or circuit problem). Both cooling fans are inop. I unlugged the temp sensor at rear of block and the gauge on instrument cluster stopped registering, so I plugged it ba...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick Century Special 3.3L Hesitation VIN: 3G4AG54N1P
thank you to everyone who responded,most suggest maf sensor should have included that i was using a/c delco oe sensors. found that i had an intermittent fuel pump operating at times pressure would drop to 35 psi.replaced pump and strainer with new pump and car...
1994 Buick Skylark Custom 3.1L Hesitation, Stall VIN: 1G4NV55M4R
Well this one is finally out the door and fixed. I had 16 good responses and tried many of them. Early in the diagnostic procedure I had checked the fuel pump for volume, I had left the sample sitting on the bench and after a couple of days the color of the fu...
1993 Chevrolet S10 Blazer Tahoe 4.3L heater core VIN: 1GNDT13WXP
The info I recieved from a few of you was great. I guess the main thing I wanted to know was the difference between oe and after market heater cores which I got. OE has much more surface area. But no one has experienced problems like mine with aftermarket core...
2000 Chevrolet Express 1500 5.7L MIL Lamp on VIN: 1GBFG15R0Y
we replaced y-pipe with factory and the post o2's stablized and the vehicle passed catmoniter tests with out setting code again. Trouble codes: P0430.
2001 Chevrolet Impala LS 3.8L low coolant indicato VIN: 2G1WH55K31
Hi All, Well, I told the customer what most of you told me---The sensor is located in the right side radiator tank, and the easiest way to change it is to remove the right side headlamp. He told me that it is now intermittant, and he will wait for a while, h...
1999 GMC Sierra 1500 SL 4.8L No Start VIN: 2GTEC19V6X
Hi techs, millions of thanks for your time and replies. after many more hours of testing,cursing and freezing this problem is solved. Everyone had great suggetions for tests and possible causes. Several leaned toward crank,coolant,air temp and fuelproblems. Iu... Trouble codes: P0101 (maf sensor performance), P0108 (map sensor cirt.high voltage), P0157 (o2 b2 s2low voltage), P0158 (o2), P0300 (misfire detected), P0336 (ckp sensor performance).
1995 Pontiac Grand Am SE 2.3L low power VIN: 1G2NE55D7S
Hi, Sorry it has taken so long to reply back. On this Grand Am I followed what erveryone said and checked for a plugged exaust system. We removed the flange bolts and ran the car but it was the same I called the customer and told him that it was probably going...
2000 Pontiac Grand Am SE 3.4L MIL Lamp on VIN: 1G2NF52E3Y
Oh man...I finally got the customer to drop the car off, while she was on vacation, and was able to spend a couple hours with it. I got the uptated software for my brick and started in on the egr system. I noticed that my pintle position % was 2 at idle, so I ... Trouble codes: P0403.
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