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Prev Professional Automotive Repair Technical Discussions for November 16, 2013
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Open Help Requests for GM
Help Request Answers
1997 Chevrolet Cavalier 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G1JC524XV
Good Morning Techs, Have this 98 Cavalier that came in with a Miss on Idle on Number 4 Cylinder. After diagnosing could not pinpoint reason for miss at idle (only at idle). Felt as though it was a vacuum leak. Sprayed propane around intake and injector ports,... Trouble codes: P0304
2004 Chevrolet Suburban 1500 LS 5.3L Poor Idle Quality, Hesitation, MIL Lamp on, will not shut off VIN: 3GNFK16Z14
I installed a used vin T engine in this Suburban that had a vin Z engine in it. I used the original harness and injectors and fuel rails. Now I got all sorts of weird problems. The above codes come back when started after being cleared. It starts and runs fair... Trouble codes: U1064 (loss BCM VTD DIM PZM /or SBM data), U1041, U1026, U0107, P0200, P0230
2005 GMC Sierra 1500 SLE 5.3L unknown VIN: 2GTEK13TX5
Truck has vibration in body that starts at 45 & continues until 70 mph. We tried the wheels & tires on another vehicle & they are fine. Wheels & tires from other vehicle made no difference. Removed driveshaft & had balance checked -ok replaced rear shocks (on...
2006 Pontiac Torrent 3.4L Misfire VIN: 2CKDL63F36
I have replace the number 2 plug twice and it comes back misfiring on the same cylinder due to the plug going bad.the plug does not look fouled out and looks like its burning clean.if i put a new plug in it will run great for about 500 miles. The fuel trims lo... Trouble codes: P0302 (Misfire 2 cylinder)
2006 Pontiac Grand Prix 3.8L emissions VIN: 2G2WP55286
My car has a intermittent po455 code large leak for emmissions. Have replaced gas cap with ac delco cap and installed a ac delco vent solenoid at the intake manifold. The code went away for 1 week but comes back only in the morning. The gas cap lite comes on a...

Fixes & Summaries for GM
Fix/Summary Answers
2003 Buick LeSabre Custom 3.8L Cuts out, Stall VIN: 1G4HP52KX3
I am going to call this a fix. I am sorry for the late post but I was not 100 percent of the fix so I waited for feedback from the customer. As of yesterday the car has been fine. Since we never were able to duplicate the problem to the point where we could ge... Trouble codes: P0101.
1990 Chevrolet K1500 Cheyenne 4.3L No Start VIN: 1GCEK19Z1L
Thanks to all who replied. It's harvest time here & weather is not cooperating. It may be this winter before I can get this thing in here to explore some of these ideas. If I find anything I will post as such but for now I need to close it before it gets close...
2002 Chevrolet Avalanche 1500 5.3L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 3GNEK13T22
It was the valve spring closest to the firewall, exhaust, on the left side, I guess it could have been worse, could have been the right side. Trouble codes: P0300 (random misfire), P0106 (Map out of range).
2008 Chevrolet Colorado LT 2.9L passkey VIN: 1GCCS34928
Thank you to all who replied to this post. On advise from members I checked the battery and connections. While all looked good the battery was original and more than 5 years old. I have replaced the battery and cleaned all connections. The problem has not retu...
1987 Pontiac Firebird Trans Am 5.7L fuel injection
I have narrowed the problem down to the MAF. with the duct work from the MAF to the throttle body on it runs lean 2000ppm HC's .16% CO with the duct off it runs perfect 200ppm HC's and 1.65% CO. this is with MAF plugged in. unplug it and the CEL illuminates. t...
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