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Prev Professional Automotive Repair Technical Discussions for May 15, 2012
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Open Help Requests for GM
Help Request Answers
1996 Buick Riviera 3.8L Poor Idle Quality, Misfire, MIL Lamp on, No power VIN: 1G4GD2212T
The vehicle has little to no power. There are misfires recording on cylinders 2,4&6. 2&6 minimal misfires (200-400) with 4 being upwards of 10,000. New spark plugs, coils & module tested good with adequate spark, wires are good. Fuel pressure tests within spec... Trouble codes: P0300 (Cylinder misfire detected), P0171 (Bank 1 lean), P0174
1997 Chevrolet K1500 Suburban LS 5.7L MIL Lamp on VIN: 1GNFK16R0V
customer replaced his own distributor,had pin sheared at distributor gear, now has this code.brought to me to reset timing.should be easy task but this one will not cooperate. i set ballancer mark to 0tdc,cannot seem to get dist rotor to point at the 8mark on ... Trouble codes: P1345
1998 Chevrolet Cavalier 2.2L Radiator Cooling Fan VIN: 1G1JC524XW
When this car is idling the cooling fan comes on but will not turn off. It will stay running forever. And of course after a few minutes the air being pulled through the radiator becomes cool. The only time the fan will turn off is when i drive around the block...
1998 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC1247W
Vehicle came on a tow truck . No start . no communication with other than ecm . Retrieved code u1016 . My s/on scanner only shows EBCM module , Air bag module and there's no communication with neither one . Tried disconnecting modules one at a time and still n... Trouble codes: U1016
2002 Chevrolet Avalanche 1500 5.3L unknown VIN: 3GNEK13T72
Don't have much to go on other than customer's complaint. Really good customer of ours, otherwise I would tell them can not duplicate and ship it. Our customer said he was backing out of the a parking spot, he cut the wheel sharply to the left and all of the s...
2002 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHK231X2
I have this duramax runs fine but after driving long distance when you shut it off it cranks but won't start. I show rpm while cranking. with pressure gauge hooked up at service port i can pump pressure up to 10 psi and it falls off. don't see any leaks. desir...
2002 Chevrolet Impala LS 3.8L p1351 VIN: 2G1WH55K22
hello i have this impala driving me crazy the code p1351 just keep coming back any idea please.
2004 Chevrolet Malibu 2.2L Unknown VIN: 1G1ZS52FX4
Thank's in advance to everyone how takes time out of their day to read and respond to this post. I have this 04 mlibue that sets a P1887 for TCC release switch and no other codes. When I watch the switch on the scan tool I can see it go open and closed rapidly...
2007 Chevrolet Equinox LS 3.4L Shift solenoid a VIN: 2CNDL13F27
Code PO973 Shift solenoid A ( or 1 ) low or shorted to ground. Problem is intermitten when warm defaults to 5th gear. Tcm is prindle switch. Anyone have history with this code. Trying to find pin out for soleniod with tcm removed.
2002 GMC Sierra 2500 HD SL 6.6L Mechanical VIN: 1GTHK231X2
Thanks in advance for your time.I GOT THIS ALLISON tranny in for a leak and feeling like it is stuck in toe haul.Relaced a broken rear housing for the leak and refilled.Sifted through the gears and a hard shift into drive broke the housing again.At 500 a pop u...
1995 Oldsmobile Silhouette 3.8L Misfire VIN: 1GHDU06L8S
9 months after doing the intake and repairing the misfire the car came in for another misfire. Found the porcelain on a spark plug broken on the outside of the plug. replaced plugs and inspected with a mirror to make sure there no cracks. now a month later it ...
2000 Pontiac Bonneville SSEi 3.8L Stall VIN: 1G2HZ5410Y
Looking for help on this 00 bonneville with supercharged 3.8 v6. Every so often dies. We noticed it loses fuel pressure when it dies. Checked and found fuel pump still has 12v to it but is losing its ground through the fuel pump module that is in the trunk. We...
2003 Saturn Vue 2.2L Starting VIN: 5GZCZ33D33
vehicle had no start theft light was flashing, told customer to do the 10min key on to see if relearn would work, towed to us, started right away, to theft light or code. Other codes are trens u0140 lost comm with bcm, airbag code u1000 class 2 serial problem,...

Fixes & Summaries for GM
Fix/Summary Answers
2000 Chevrolet Express 3500 7.4L Transmission VIN: 5B4LP37J2Y
Thanks for all your help. Scan tool did show some slippage. However scan tool was showing a error in 2nd shift solenoid at times. It changed with TPS. Thats still doing it but dose not seem to affect any thing. We sent to have a heavy duty Torque convertor pu...
2001 Chevrolet Express 3500 5.7L Misfire VIN: 1GCHG35R21
Tuesday has started out a lot better. Thanks Nick for the tip. I was trying yesterday to apply pressure to the rail and actuate the injector without sucsess. I decided to give it another shot today. This is what I did: Pulled the fuel pump relay. Filled my inj...
2001 Chevrolet Suburban 1500 5.3L MIL Lamp on VIN: 3GNFK16T81
Thanks for the help guys. I wasn't sure if an exhaust leak would effect 02 sensor. But most of you knew it would. Thats exactly why I put in a help request, I don't like throwing parts at a problem. After replacing the bank 2 pipe to manifold donut the fuel ... Trouble codes: P1153 (Insufficient switching 02 sensor 2-1).
2003 Chevrolet Impala 3.4L Stall VIN: 2G1WF52E33
Checked IGN v1 at pin 24C2 at ECM and pin A10C2 at BCM. These never dropped out even while MDI showed voltage dropping out on Pid IGNv1.This proves ignition switch is good. Also Scoped CAM and Crank signals at ECM and IC and never had a glitch when car died. D... Trouble codes: P0122 (TPS circuit out of range), P1122 (TPS circuit low).
2001 Oldsmobile Aurora 3.5L Cuts out, Stall VIN: 1G3GR64H11
What a great response to my request. There was so many great ideas but Doug [...] got it right on, and this one is going in the books. THE PROBLEM WAS THE LEFT SIDE MOTOR MOUNT. That made so much sense when I finally thought about, no codes, working good in reve...
1967 Pontiac Firebird 400 6.6L Surge, Poor Fuel Economy
Well, its alittle better now. like I said in update, I drilled some holes in the throttle plates and then I slapped in a new base gasket/insulator. I am thinking the next step is ramping up the base timing and limiting the overall advance(mechanical advance di...
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