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Prev Professional Automotive Repair Technical Discussions for July 9, 2004
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Open Help Requests for GM
Help Request Answers
1991 Buick Regal 3.8L Poor Idle Quality VIN: 24GWD54L7M
customer brought in with miss and running rough. discovered 2 ignition wires crossed changed that miss disappeared. road test car runs perfect but at idle lopes and runs rough is loading up on fuel.. hard start because of flooding need to push accelerator to f...
1995 Buick Park Avenue 3.8L battery, Alternator not chraging VIN: 1G4CW52K9S
I'm getting 10-11 volts when running and it's running only on the battery! I have went through all the wiring looking for a short or open in wiring. I have no voltage coming out of the connector with the one red wire. The fuses are all check and good, the guag...
1998 Buick Park Avenue 3.8L abs module VIN: 1G4CW52K3W
This car came to us from another shop with an abs problem. Lucky me. That shop replaced the engine and customer states that the abs light was not on before the engine swap. I scanned the car with our snap-on scanner and came up with a code c1255. Trouble shoot...
1999 Buick LeSabre Custom 3.8L starter VIN: 1G4HP52K6X
Hey Guys, We've got this Buick in our shop that customer complains will start several times and then the security light comes on and stays on and then the car will not start. He says after waiting several minutes, the security light will go out and the vehicl...
1998 Cadillac Catera 3.0L Misfire VIN: W06VR52R8W
This car has a miss when first started in the morning drives for about a minite stop shut the car off and restart the miss is gone if you continue to drive on that first initial first start it will miss till you stop and restart code p0301 misfire dected comes...
1993 Chevrolet C1500 Cheyenne 4.3L Excessive Emissions, Poor Fuel Economy VIN: 1GCDC14Z5P
came in for failed emmission test check basics replaced spark plugs checked O2 sensor operation found that O2 voltage was always at .45V and the system was always in open loop when disconnecting O2 sensor the voltage would stay at .45V when grounding O2 signal...
1994 Chevrolet Caprice Classic LS 4.3L Poor Idle Quality, Misfire VIN: 1G1BN52W2R
Greetings to all Opti Spark Gurus, we are on a good track thusfar, but after searching the data base, I believe this will be a good addition to the fix data base as to understanding the Opti Spark system and its funtion. This problem came on all at once, ther...
1997 Chevrolet C3500 6.5L Cuts out, Stall VIN: 1GCGC33F2V
this truck came to the shop about a year ago with the very same problem , the mechanic trouble shot and determined it to be a pump, however this time he thinks its electrical? the problem is while operateing the truck on our flightline driveing slowly, the dri...
1999 Chevrolet Lumina 3.1L Surge VIN: 2G1WL52M1X
car surges under light to medium throttle and will set po336 on every test drive.have not seen code set while in shop.have normal waveform from 24x at ecm and 3x.have 8 times freq. from 24x as from 3x.during snapshot engine rpm is at 1600-1700 rpm when code tr... Trouble codes: P0336
1998 GMC Safari SLE 4.3L No Start VIN: 1GKEL19W2W
Vehicle towed in no start. Replaced fuel pump had power and ground but to fuel. After job still no start. The pump will run now. Will run with fuel added to intake. Inspect ignition all is ok. Plugs all dry. Followed a flow chart that led me to a conclusion of...
1997 Oldsmobile Regency 3.8L Surge VIN: 1G3HC52K0V
Hello everyone, I have a weird one here! This olds has a surge at highway speeds. It will only start to surge if you a pulling a slight hill or loading the engine a bit. When it is'nt surging, the car runs great, no complaints. I took a snapshot at the time th...
2001 Pontiac Grand Am SE 2.4L security light VIN: 1G2NF52T31
came in crank no start, was testing noid & spark vehicle started in bay ran rest of day. Had p1632 history code. replaced tumbler assy. as recomended repair. now security light stays on soilid
1996 Saturn SL2 1.9L shift VIN: 1G8ZJ5571T
Hi Techs - I have a 5 speed 1996 SL2 in for high-effort shift into 1st and grinding 3rd. Both retainer clips are present and I replaced the shift cable assembly after finding the casing pulled away at the trans and torn rubber boots. I also lubricated the nylo...

Fixes & Summaries for GM
Fix/Summary Answers
1933 Chevrolet Coupe 216CID Hesitation, Misfire VIN: 0000030558
The little engine that could, finally did, and it had amazing power. Thanks go out to all those who replied, and especially Denny [...] of Canyon Automotive who took time out to call me and give me over an hour of 'Old Cars-101'. What follows is a summary...
1957 Chevrolet belair wagon 350CID Cuts out, Stall, popping when punch VIN: VB57S16008
1st off thank you to the 100's of members that have offered help and 'old school ' understanding to me. like i said i sent the JC WHITNEY carb out to get redone. the guy found that valves and primary seat were bent and messed up. not only that the adjustments ...
1986 Chevrolet S10 Blazer 2.8L Hesitation, Sometimes backfires VIN: 1C8CS18R8C
Thanks for all the help guys. Tried what you said, ran into a brick wall. Nothing seemed to change this one. Customer came and got it, hope I get to try again later. Trouble codes: 44 (Lean Exhaust), 24 (No VSS Received), 15 (Coolant Temp Sensor High or Open), 33 (Map Sensor or Circuit Open or High), 32 (EGR System Problem).
1996 Chevrolet K1500 5.7L ac VIN: 2GTEK19R3T
Unfortunately this one has not come back for a fix, so I'm not sure if we are right or not. I got a lot of suggestions, and you can read them in the replies. As far as we can figure, the bottom line fix for this one has to be an internally restricted (or plugg...
1997 Chevrolet Express 3500 5.7L 1-2 shift VIN: 1GCHG85R7V
Hello - Yes indeed this vehicle is fixed - turned out extremely well. What I found is once I removed the VCM from underneath the master cylinder assembly, by the way this has hydroboost on it, I found corrosion, not alot, in the connector terminals. There are ...
2000 Chevrolet Express 3500 5.7L No Start, Cuts out, Stall VIN: 1GBJG31R54
Raymond from Indiana actually checked on the code which was ignition code not crank sensor, went through flow chart for ignition control module, all tests passed, replaced module and coil and sent out. its been about a week, so far so good, ecm checked ok, no ... Trouble codes: P1361.
1997 GMC Jimmy SL 4.3L no start condition VIN: IGKDT13W8V
I replaced the ignition switch that repaired the no start and stalling condition. There was a aftermarket alarm that was spliced into power leads on the switch.
2001 GMC Sierra 1500 HD SLE 6.0L batterie light VIN: 1GTGC13U31
I have to say I was unable to solve this problem, I did swap out the alt with one from another vechicle with no change,the problem seems to happen only occasionaly and I was only able to see it once ,I checked all the connections with no visual problem, no cod...
1999 Oldsmobile Cutlass GL 3.1L cooling system VIN: 1G3NB52J4X
there were good point in the replies i received 1 Monitor coolant temp by scan tool in drive mode 2 If the CTS is unplugged the fans are supposed to default to high speed 3 Under what condition was the vehicle overheating. i did an eval road test with coolan...
2002 Oldsmobile Aurora 3.5L stability control VIN: 1G3GR64H22
There was great info from techs. attached to the replies, there was also testing procedures faxed from Ken [...]. Regretfully the customer has not returned my phone calls, so we are not able to continue with testing/diagnosis... (not a good sign, so life go...
1990 Pontiac Grand Am 2.3L no power VIN: IG2NE1102L
Hi guys and girls.I think(not sure) I have found the problem as to why my quad 4 is lazy,the VSS is not hooked up and there is nowhere to connect it to on my pulling tractor.When the ECM dosen,t see info from the vss it sets a code resulting in base timing and...
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