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Prev Professional Automotive Repair Technical Discussions for December 22, 2008
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Open Help Requests for GM
Help Request Answers
1994 Chevrolet C1500 5.7L Misfire VIN: 1GM235GM56
I had a problem before with driving and you would give it gas and it just would die out, so i replaced fuel pump and that fixed the problem. I now have a problem with a miss, it only happens while in normal cruise. lets say you give it gas in park at like 2k r...
1999 Chevrolet Monte Carlo LS 3.1L Long cracking time VIN: 2G1WW12M7X
Ok this ones driving me nuts any new info would be great. The problem is that this car fuel pressure won't stay at the rail when the car is hot intermittenly.When cold its fine pressure stays put when car is turn off. When its doing it i've blocked the feed li...
2002 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: AGNDT13S12
Vehicle runs very poor @ idle and resets fault code P1345 (CKP/CMP correlation problem) every time, have not ran across this fault before, hopefully someone has. Alldata diagnostics ask if code P0014 is set (it is not), asks to check Cam Phase Angle parameters... Trouble codes: P1345 (CKP/CMP correlation problem)
2002 Chevrolet S10 4.3L Front Axle VIN: 1GCCT19W62
This truck will clunk intermitently in 4WD. It does not seem to be speed related as it has happened to me twice - once on the highway at 80kph and again turning a corner at 20kph. This clunk sounds like it coming from the actuator area on the front axle housin...
2002 Chevrolet Avalanche 1500 5.3L Oil Pressure VIN: 3GNEK13T52
Customer is concerned with the oil pressure reading high on the vehicle. When the vehicle is hot and at idle the oil pressure does not go below 35-40 psi, and at 3K+ RPM it is 75-80 psi. We have done the last several oil changes and have used Castrol 5W30 oil....
2004 Chevrolet Suburban 2500 LS 6.0L shifting issues VIN: 1GKFK66U54
have tested and tested and tested im about to pull rest of my hair out.have 5 codes and no power to shift solonoids.codes are p0740,p0753,p0758,p0785,p2761. to drive vehicle takes off in first and thats it no more shifts.stays in first . reverse works fine. ca...
2008 Chevrolet 2500 HD 6.6L low power VIN: 532545Y545
fuel is gelling,customer took truck to dealer under warranty,they said too much biodiesel in tank mentioned tsb 08-06-04-032 Truck is on 3rd filter with 15,000 miles.I find it hard to believe the small amounts (5%)biodiesel are causing it to gel,there are a lo...
1989 GMC R2500 Suburban 5.7L Won't shut off VIN: 1GKGR26KF8
This Suburban will not shut off. When we turn the key off, the voltage signal to the ECM pin A6 drops from 14.6v to 9.5v. With the key on, engine off, the voltage to A6 is zero. We are also getting a slight electrical burning smell under the steering column bu...
2005 GMC Canyon Z71 SL 3.5L Poor Idle Quality, Hesitation, Cuts out VIN: 1GTDJ14615
Sounds like vacuum leak under cover for intake manifold. No smoke machine. Intermittent stall, rough idle and reduced power light comes on. Could be something but unfamiliar with this code. Trouble codes: P0068
2005 GMC Sierra 1500 SLE 5.3L Electronic VIN: 2GTEK13T85
This truck very intermittently will lose all shifting and only has 3rd gear. I'm sure that it is losing voltage at transmission. I took this truck to a local transmission shop for the diag and repair. He had the truck for a week and finally told me that there ...
1994 Oldsmobile Cutlass Supreme 3.1L No Start, MIL Lamp on VIN: 1G3WH55M2D
Vehicle was towed in. Customer complained of a high idle problem and then it cut off and would never restart. I have checked fuel pressure. checked crank sensor. Spark and injector pulse seem to come and go. I would appreciate any ideas. I've been through the ... Trouble codes: 17 (camshaft circiut), 33 (map high voltage), 35 (idle speed error), 36 (ignition module 24x signal malf), 46 (passkey circiut), 82 (ign. module 3x signal)
1998 Oldsmobile 88 Royale 3.8L wheel speed sensor VIN: 1G3HN52K0W
This one has me scratching. This olds had hubs replaced for noise and intermintant speed sensor issues. Then hubs replaced at diffrent times for speed sensor codes, (diffrent shop both times.) Now i get it in the middle of a blizzard with traction control and ...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Cadillac DeVille 4.6L battery VIN: 1G6KD54Y7V
I like to thank every one who helped. Some said the PZM(BCM) is the problem because it is a common failure. Another said to check the IPC and thats where I found a Problem. By disconnecting the IPC I was able to get both the radio and the PZM to go to sleep. A...
2003 Cadillac DeVille 4.6L Stall, MIL Lamp on VIN: 1G6KD54Y53
Well, nearly everyone suggested replacing the crank sensors due to a faulty design. We never could get anything to show up but the plastic pipe plug in the bottom of the plenum was seeping oil out and the intake gaskets looked like they were seeping. Never pic... Trouble codes: P0102 (maf sensor frequency low), P0386, P0385, P0440, P0336, P1372.
2006 Cadillac DTS 4.6L driver side head light VIN: 1G6KD57Y96
thanks for everything i have repaired this vehicle it was the bulb and thanks for everything.
1989 Chevrolet Camaro Iroc-Z 5.0L Poor Fuel Economy VIN: 1G1FP21F2K
Thanks for all the replies, the owner is moving out of the area and wanted to give me one more stab at his problem, recieved many good suggestions such as plugging the air injection,I encountered this very problem on my wifes tune port camaro 10 years ago,it t...
1999 Chevrolet Tracker 2.0L Unknown VIN: 2CNBJ13CXX
2000 Chevrolet Blazer LS 4.3L MIL Lamp on VIN: 1GNDT13W7Y
The Truck is fixed and it turned out to be defective fuel pump and the wiring to the pump,who ever changed it before did not crimp the new plug good enough and while checking it on cold startups it did not turn on every time,so after changind the new pump with... Trouble codes: P1351.
2001 Chevrolet Blazer LS 4.3L No Start, obd monitors VIN: 1GNDT13W51
Thanks to all who replyed. I had to disconnect the battery and rub the cable ends together and let it sit disconnected for a while and ran the drive cycle again this time the monitors ran no problem.He was not interested in fixing any of his other problems.Wen...
2002 Chevrolet Blazer LS 4.3L oil pan VIN: 1GNCS13W22
Thank you to all replied. Indeed it was the right rear corner of the oil pan that was leaking. I removed trans cleaned area, installed flex plate and starter, ran and verified. It is possible to remove oil pan with engine in the vehicle, and motor mounts le...
2003 Chevrolet Express 3500 6.0L brake lights VIN: 1GCHG35UX3
thanks for all the good pointers. we did end up finding a bad ground on this thing. it has shelving inside so checking the wiring was a challenge. we cleaned each ground until we got it working.
2007 Chevrolet Malibu LS 3.5L horns VIN: 1G1ZS58F07
well we got the car back and left it in all night the next day all is well don't know if water was a problem or not but haven't seen her for a week. still worried but until it breaks again we won;t know. thanks to all your replies and diagnostic help. we hope ...
1992 GMC K1500 Sierra 4.3L cooling VIN: 1GTEK1423N
thank for all your reply's. the intake gasket took care of the problem. for any one puting new intake gaskets on make sure both meatal tab blocks are facing to the back of engine,open coolant ports toword thermostat. easy oversite when both intake gaskets are ...
2000 GMC Savana 1500 4.3L rear lighting VIN: 1GTEG15W7Y
good job bad grounds replaced wirring harness on both sides few guys said that could be problem. thanks for replies great job.
2009 GMC Yukon XL 1500 SLT 5.3L MIL Lamp on VIN: 1GKFK36399
GREAT REPLIES! The P069E is a code indicating a problem with the Fuel Pump Control Module circuit and can not be cleared without repairing the underlying problem. We inspected the module and didn't see any physical damage to the module or the wiring. Then the ... Trouble codes: P069E (Fuel Pump Control Module).
2000 Pontiac Sunfire SE 2.2L Misfire VIN: 1G2JB1240Y
check out everything and then got back to the basics and checked compression. found # 1 and 2 cylinders slightly down on compression. pulled head and found exhaust valves not sealing very good. did valve job and everything is back to normal. thanks for all...
2007 Pontiac Grand Prix 3.8L key fob VIN: 2G2WP552X7
i am sorry for getting back to everyone so late but the customer had to have the car back before i had more time with it. i checked the data signal and had 334 miilivolts and this was the same as other modules. the power and ground were ok. i think that the mo...
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