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Prev Professional Automotive Repair Technical Discussions for June 5, 2014
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Open Help Requests for GM
Help Request Answers
1987 Buick LeSabre Custom 3.8L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1G4HP5130H
This vehicle bogs down and chugs on accelearation. This a customers mom's car.the car is running rich. No doubt. It looks like it has had a reman maf sensor put on and a crank sensor. Values according to alldata are double what they should be for maf. Checked ... Trouble codes: 34 (Mass air flow), 13 (Oxygen sensor)
1988 Chevrolet C1500 Cheyenne 5.7L Cuts out, Stall VIN: 2GCEC19K5J
this one is getting me mad, vehicle runs great in shop and at idle, as soon as I back it out of shop and put it under a load it dies and wont immediately restart, found that I am losing injectors some how, replaced ecm with test ecm, found wires to injectors s...
1999 Chevrolet Express 1500 5.7L front coil spring VIN: 1GBFG15RXX
Sorry this is going to be long but if someone has access to GM service info and exact direction front coil springs oriented that would help since Mitchell and Alldata conflict! I have this 1999 express 1500 conversion van that although high miles has been ver...
2011 Chevrolet Aveo5 LS 1.6L coolant recovery bottle
Hello GM Chevy techs I have the above vehicle,first time I have worked on the vehicle. I'm doing a 60k service according to the factory owners manual. It only requires coolant change at 5 years 150000 miles Im getting a small to moderate amount of a yellowis...
2003 GMC Yukon XL 1500 Denali 6.0L Abs System VIN: 1GKFK66U73
This vehicle had abs issues that made the abs light, brake light and the t/c light come on with the indicator saying (service stability) right when you cycle the key and no codes present, so i replace the abs module send vehicle out to get it programed and now...
2008 Pontiac Grand Prix 3.8L No Start VIN: 2G2WP55228
Hey guy i need help! This is a tricky one. Came on hook no start. First thing we did chagred the bettery and tried to start, but no start. Scanned for code and too many codes came up. (p0030,p0036,p0201,p0202, p0203,p0204,p0205,p0206,p0412,p0418,p0443) all the... Trouble codes: P0030, P0036, P0202, P0203, P0204, P0205
2007 Saturn Aura XR 3.6L Misfire, MIL Lamp on VIN: 1G8ZV57757
GM tech, please help on this baby, install scanner, p0300-misfire, road test & verify engine has a light misfire on #1,3 & 5 cylinder at light throttle only at 1500rpm [...] 2000rpm, check fuel trim & oxygen sensors reading, all within spec, sway cam sensors & so... Trouble codes: P0300

Fixes & Summaries for GM
Fix/Summary Answers
2006 Cadillac DTS 4.6L in drive or reverse VIN: 1G6KD57Y46
Trans is going to be replaced. Thanks for the help on this.
1994 Chevrolet C1500 Cheyenne 4.3L High Idle VIN: 1GCDC14Z1R
First off, many replies and very much appreciated. Bottom line, throttle position sensor(TPS). When vehicle first came in, we had an issue with the TPS jumping up to 4.9V and it would run rough. I tightened the connector connection, and the voltage was back...
1999 Chevrolet Tahoe LS 5.7L MIL Lamp on, Intermtnt hard start VIN: 1GNEK13RXX
Thanks for all who replied. There were many great suggestions that were very helpful. I am embarrassed to report the drop in fuel pressure was from a faulty adapter. I did not use it when I tested at the fuel filter as I needed a different adapter. Oh well!... Trouble codes: P0172, P0175.
2003 Chevrolet Impala 3.8L Unknown
All said V points up. The smaller metal strip is the thermo element which must be pushed up and held flush with the case. William gave me a web site that rebuilt this tranny. On picture #168 it shows this piece very well. I'm glad I checked with you guys befor...
2004 Chevrolet Malibu LS 3.5L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G1ZT54854
first of all, thanks to everyones start i have learned not to trust every test available on our after market scan tools, per some of your posts & i wouldnt have known how inaccurate the inj balance test was if i hadnt tried it w/ the rail out of the in... Trouble codes: P0300.
2001 GMC Savana 2500 5.0L Ebcm VIN: 1GTFG25M21
ABS Module is suspect. customer declined repair at this time
2007 GMC W4500 Forward W4S042 5.2L crankcase VIN: J8DC4B1607
Knowing that we had at least a high pressure leak to begin with, that is where the tech was looking and focused on. Since we work on these vehicles fairly steady, we happen to have a couple of spare high pressure pumps left over. He pulled one completely apart...
2006 Saturn Vue 2.2L compressor VIN: 5GZCZ33D16
You can't leave the scroll valve in backwards because the low side goes to 20 PSI or way too cold to leave it that way. Was advised that the evaporator would probably freeze up keeping the oil from circulating. The clutch would not cycle at that low pressure,...
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