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Prev Professional Automotive Repair Technical Discussions for September 30, 2011
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Open Help Requests for GM
Help Request Answers
1995 Buick LeSabre Limited 3.8L Poor Idle Quality, Surge, MIL Lamp on VIN: 1G4HP5217S
cust states would not start had vats system repaired and ran good for 3 days then started to lope at idle cel light on trans will not shift correctly. we do have a tech 2 and a master tech scantools neither will communicate with pcm removed all other modules f...
2006 Buick Lucerne CX 3.8L MIL Lamp on VIN: 1G4HP57276
Car had code p0332, so I replaced knock sensor on bank 2 with a Delphi part. Yes I changes the correct one. The code came back after a few days. Alldata has horrible diagnostic info. Does anyone know how to test the circuit. Should I have 4.6 volts DC at the w... Trouble codes: P0332
1972 Chevrolet El Camino 5.7L Misfire
Hey guys I have an odd one here.I replaced the engine in this car with a GM reman.Upon starting engine I noticed a misfire .Of course i went about rechecking everything I did and all was ok.Spark plug wires were in correct firing order.I then started checking ...
1994 Chevrolet K1500 Suburban 5.7L CV joint VIN: 1GNK16K1RJ
Hello there, we got a vibration that feels more in front of truck, comes in at 32mph and shakes a bit more at higher speeds. It almost feels like a frozen U-joint, but if you put truck in neutral and race it up to 2200rpm or so it decreases the vibration 80%, ...
1995 Chevrolet G20 Chevy Van 5.7L oil pressure VIN: 1GBEG25K1S
The driver claims the van lost all its coolant and overheated. We cannot find a leak and holds pressure. The next day the oil filter exploded. We replaced the oil filter and the new one exploded almost immediately. The oil pressure gauge pegs high after a few ...
1996 Chevrolet Camaro 3.8L Excessive Emissions, Misfire VIN: 2G1FP22K7T
Vehicle came in for failed emissions and running rough at idle. only rough at idle, at about 1500 rpm engine smooths out. Driving down road cannot feel missfire. found cylinder #1 dead at idle. Tested spark - good. checked for vacuum leak around #1 intake runn... Trouble codes: P0300
1996 Chevrolet Astro 4.3L No Start, no serial data VIN: 1GNDM19W2T
this van will not start in moist conditions. it however will not run now. found there to be no fuel pressure. checked for good connection on all components ie relay center, fuel pump. all good. no power going to pump (2 sec pulse or on crank.). oil pressure se...
2003 Chevrolet Impala 3.4L abs module VIN: 2G1WF52E83
abs code C1298 pcm class 2 serial data link fault, pcm code [...] comm EBCM-checked powers and grounds using a headlightusing the grnds in connector light bright, loaded system with vechile running no change,run a redundant power from battery to pink ing w...
2004 Chevrolet Malibu 2.2L ignition lock cyl VIN: 1G1ND52F84
Thanks in advance to all who take the time to reply. My problem is this 04 malibu with the ign lock cyl. in the dash, it was towed in because key won't turn in the ignition. My Mitchell has no info. other than to turn the key and push in the tab to replace the...
2004 Chevrolet Suburban 2500 LT 8.1L Encoder Motor VIN: 3GNGK26G74
Vehicle came into shop with complaint that intermittantly the transfer case lights would switch by themselves. has DTC: C0327--encoder circuit. We disassembled the motor to replace the encoder sensor and found it best just to replace the whole tranfer case/enc...
2005 Chevrolet Corvette 6.0L trans or tube VIN: 1G1YY24U35
This Corvette has a rattle in any trans position. With a slight rpm increase the noise goes away. We disconnected the torque converter and the noise goes away. We removed the trans and sent the converter out for inspection. The converter company said they foun...
2000 GMC Yukon XL 1500 SLE 5.3L Misfire VIN: 3GKFK16T4Y
Hi folks, thank you in advance for your help. This Yukon has a strange intermitent miss. it happens either cold or hot and only once or twice a day. When you start it up it will either run great or will barely stay running. When it is acting up it will continu... Trouble codes: P0300 (Random multiple misfire)
2002 GMC Sierra 2500 HD 6.0L Spark Knock/Detonate VIN: 1GTHK23UX2
Customer brought truck in for noise. Verified as spark knock. Found TSB on knock sensor corrosion, removed the intake and inspected sensors - both ok. Tapped on block and both put out AC volts. Reassembled intake with new gaskets. Cleaned MAF eventhough readin...
2003 GMC Yukon XL 1500 SLE 5.3L MIL Lamp on VIN: 3GKEC16Z13
The problem is intermittent. I have never been able to duplicate the problem but every time 10 minutes after the customer picks up the vehicle he calls back and says the light is back on. The vehicle runs perfect just the light comes on. Trouble codes: P0101
2005 GMC Canyon Z85 SLE 2.8L No Start VIN: 1GTDT19865
Good morning, I have this GMC Canyon here with a dead instrument cluster(the only things that work are the passkey and mil lights). I checked power and grounds and they are both good. All of my exterior lights work and the truck runs fine. I also have a inter... Trouble codes: P0650 (Mil control ckt problem), U1301 (Class 2 communication ckt low voltage), B0687 (Security system indicator low)
2006 GMC Sierra 1500 SL 4.3L No Start, Stall VIN: TGTC14XX6Z
towed in no start found good fuel pressure and injector pulse found no spark checked spark from coil and found no spark. replaced crank sensor due to reluctor marks on it and still no start. found burn markes on coil and we had a new coil and ignition module i... Trouble codes: 128 (coolant temp out of range)

Fixes & Summaries for GM
Fix/Summary Answers
1994 Cadillac Seville STS 4.6L No Start VIN: 1G6KY5294R
first of all thank you very much for all your responses everyone! I have had to work on this car as I have time, so it took a little time to get to the bottom of it. It turned out to be a ground wire that was broken with the sheathing in tact. just above the v... Trouble codes: 36 (linear egr pintle position out of range), 95 (engine stall detected).
1982 Chevrolet Corvette 5.7L Misfire VIN: 3GA1Y61851
this car is not fixed. its hard to get it to act up. i finaly did. i did plugs again cause it was running rough, but it started coughing real bad. thought it was mechanical, but i unplugged the est wire and it smoothed out, plug it back in it gets rough agaIN....
1992 Chevrolet K3500 Silverado 7.4L Brakes VIN: 2GCHK39N4N
The short answer is the problem was the calipers. We pulled apart the latest ones and found two different TYPE of pistons installed. (NOTE:) One side was significantly tighter that the other. One piston was slightly hanging up. We then ordered a different bran...
2004 Chevrolet Cavalier LS 2.2L Fuel Gauge&High Beam Light Indicator VIN: 3G1JH52F14
thanks for all the help guys.Douglas & Nicholas seem to have nailed it.igot digging around and behind the RIGHT headlight not the left the wiring harness going to the light was damaged .the brown parkinglight feed the pink highbeam wires were posably rubbing ...
2005 Pontiac Grand Prix 3.8L Master Cylinder VIN: 2G2WS52215
Thank you all very much! I could never find any description of how the sensor system worked and could not see the float in the dark fluid. I will try cleaning the brake reservoir to save my customer the money of a new res.
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