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Prev Professional Automotive Repair Technical Discussions for November 20, 2014
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Open Help Requests for GM
Help Request Answers
1989 Buick Century Custom 2.5L No Start, Poor Idle Quality, Stall VIN: 1G4AH51R7K
Please help this 2.5 tbi will stall at idle and starts hard. Replaced ecm with a reman a month ago and problem seemed to go away. But is back again same problem. Some times it will run ok for a week or two but most of the time it runs poorly. It seems to be lo...
2009 Buick Lucerne CXL 3.9L passinger side VIN: 1G4HD57M19
vehicle came n with decent heat on the driver side and no heat on the passenger side at all, blows cold. found that the theormastat was not any good anymore. so we replaced it. better heat out driver side now, and decent heat out of passenger side, but they ar...
2000 Chevrolet Express 1500 4.3L No Start VIN: 1GCFG15W0Y
Vehicle comes in on the Wrecker, tried to start it and it cranked over and started. Could not get it to duplicate the problem. I talked to the owner and he advised that another shop put a fuel pump in about two months earlier. I went back and checked there wor... Trouble codes: 420 (Cat low efficent bank 1)
2004 Chevrolet W3500 Tiltmaster W3S042 4.8L cranks ok no run VIN: J8BB4B1464
no power on pin 8 no power on pin 9 to ecu white wire on pin 8 red wire on pin 9 no communication with any scanner but scan tool powers up when you connect to aldl
2004 Chevrolet Trailblazer LS 4.2L Misfire, MIL Lamp on VIN: 1GNDT13S94
Thank you for the help in advance. Vehicle came in with a ck eng light and rough idle. We found the spark plugs worn and replaced. The miss stayed in #2 cylinder. The coil pack was tested and moved to another cylinder. Still miss on #2. All ignition coils have... Trouble codes: P0302 (Cyl 2 misfire)
2009 Chevrolet Malibu LT 3.6L 5th gear VIN: 1G1ZJ57799
Overhauled the unit. Replaced input housing and the rear cover for the internal damage from the 35R wave plate failure. Initial road test was successful. After check for leaks and such installer stated he thought reverse was slipping. Took it for a test drive ...
1992 Pontiac Firebird Trans Am 5.0L Stall
Thanks in advance. This car has an intermittent slow speed stall on decal. acts like slow IAC. Will catch itself most of the time and not stall. Only happens when warm and in gear. snap test on solus passes. TPS is new and non adjustable. Any ideas would be ap...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Chevrolet S10 LS 4.3L 1-2 shift VIN: 1GCDT19W3R
I tried a corvette style servo that I got on amazon for $14.00. That made the shifts firmer but it still takes a long time to make the shift when you are light on the throttle. My friend decided to live with the problem for now because it is an old truck that ...
1999 Chevrolet K2500 Suburban 7.4L MIL Lamp on VIN: 3GNGK26JXX
Thanks for all the help. The problem was an aftermarket air duct. I had a hard time coming to this conclusion because I removed it and still had the same problem. I had purchased a used OE filter housing and ducting assembly and installed it and still had the ... Trouble codes: P0102, P0172, P0175.
2009 Chevrolet Avalanche LT 5.3L Suspension VIN: 3GNFK220X9
As I said, we posted this for another shop, trying to help a friend.. Got lots of good suggestions, but sorry to say, none of them worked. They told me today they replaced the upper arms over the rear with factory parts, so they have replaced everything back...
2009 Chevrolet Traverse LT 3.6L Low oil pressure VIN: 1GNER23D69
we took the timing cover & the valve covers off to check the oil pump pressure relief valve & the camshaft caps wear,everything looked fine, so we put it all back together but we replaced all new VVT solenoids & that did it, no more low oil pressure. I think ...
2005 GMC Yukon XL 1500 SLT 5.3L Airbag
after disconnecting the battery and rebooting my pc I was able to reprogram the VTD (anti theft) module thru my Flasher Pro Interface. Ive never had this problem on a GM product before (probably my laptop). Thank you all for your suggestions and time. Trouble codes: B1001 (Airbag signal configuration).
2006 Pontiac Montana SV6 3.9L Excessive Emissions VIN: M27D174476
First let me thank everyone that tried to help. My last attempt to correct the problem entailed removing the fuel tank to inspect the evap canister etc. I was going to try a new fuel pump [out of desperation, fuel pressure was 61 or 62 p.s.i.] but upon removal... Trouble codes: P0172.
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