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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for April 2, 2014
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Open Help Requests for GM
Help Request Answers
2000 Buick LeSabre Limited 3.8L Unknown VIN: 1G4HR54K0Y
This buick was brought in for a shake/shimmy when making a turn and getting on the accelerator during the turn. First thought was bad axle shafts, replaced them. The joints in the shafts were bad. Didnt take care of the problem. Thought maybe bad shafts from o...
1997 Cadillac DeVille 4.6L Theft System VIN: 1G6KD52Y1V
Car drove in with message center saying theft deterrent problem may not start on next key cycle. Cannot communicate with any modules with scanner. Also on board diagnostics will also read no data for all modules. power and grounds at DLC are good . Cavity 2 re...
1988 Chevrolet Camaro Iroc-Z 5.7L MIL Lamp on
Hello I have this car that is kicking my butt, Code 36 keeps coming back on after 1 cycle, I have replaced MAF sensor,Relay & connector, Burn off relay & connector,ECM, I don't know what to do please help everything is OEM NEW, everything seems to be testing O... Trouble codes: 36 (Maf burn off relay)
2003 Chevrolet Tahoe LT 5.3L Heated seat, left VIN: 1GNEK13Z63
Customer complains that the LF seat heater will not stay off and gets very very hot. In my time checking this out I have found that the problem only occurs when the LF door latch is in the latched position even with the door open. The drivers side heated seat ...
2003 Chevrolet Suburban 1500 LT 5.3L Pedal drops VIN: 1GNFK16Z23
Have a question. This Suburban has a brake pedal which is spongy and drops only when the engine is running. When engine is off, the pedal can be pumped up and holds great, but when running, the pedal drops to the floor. GM dealer told customer the master was b...
2007 Chevrolet Avalanche LTZ 5.3L Poor Idle Quality, Hesitation, Stall, MIL Lamp on VIN: 3GNFK12387
This truck came in with a dead #7 cylinder caused by a failed DOD lifter and a reduced power light coming on. The customer wanted the system eliminated and the engine resealed. We removed the engine and replaced all the lifters, cam, and all engine gaskets. Af... Trouble codes: P2135 (TP 1-2 Correlation), P2119 (Throttle closed performance), P2101 (TAC Motor circuit range/performance), P1516 (Electronic Throttle Mod VS Throttle position performance), P2176 (Minimum Throttle Position not learned)
2009 Chevrolet Malibu LT 2.4L No Start, Cuts out VIN: 1G1ZH57B39
Died while driving. Started and stalled like VTD fuel cut. Instantly cuts, as opposed to fuel pump dies and engine sputters. Did this while watching VTD data (OK), then MAP, MAF, TAC, Fuel enable, all OK. After several tries without touching the gas pedal, I s... Trouble codes: P0106 (MAP sensor circuit)
2005 GMC Savana 2500 4.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GTGG25V05
LTFT B1 and B2 in the 20's at idle, 1500 and 2500rpm LTFT will go down for a moment off idle. Fuel pressure is @ 62. fuel volunme is good. Smoke checked and carb spryed the intake gasket hot and cold. Adding propane thru the intake cleans up the fuel trims. mo... Trouble codes: P0300, P0171, P0174
2006 GMC Sierra 1500 SLE 5.3L Hvac VIN: 2GTEK13Z86
2006 GMC Sierra with Dual Auto temp controls. Heater puts out full heat at any temp over 61 Degrees. If lowered below 61 goes full cold (as it should). Checked voltage to actuators and they are correct. Has anyone had a vehicle with this issue? I did look on s...
1988 Pontiac Fiero Sport 2.8L Poor Fuel Economy
I told my friend about IATN and I told him I would post this for him, in the hope that someone else out there has run into a similar problem or can give us some fresh ideas to try. Thank you. Bob

Fixes & Summaries for GM
Fix/Summary Answers
1984 Chevrolet Corvette 5.7L No Start VIN: 1G1AY0786E
The Coolant Temp. sensor was replaced with the intake but the IAT Sensor was not. Replaced the sensor, now it runs. Thanks for all the help. Trouble codes: N0NE.
1994 Chevrolet S10 Blazer Tahoe 4.3L fuse VIN: 1GNDT13W5R
Thanks for all of the replies. I ended up finding that the driver side engine mount was broken. After replacing the mount and repairing the loom to the trans, o2 sensor and encoder motor, the short is gone.
2006 Chevrolet Tahoe Z71 5.3L First,second, third, and drive. Reverse works VIN: 1GNEK13T16
Replaced the trans and problem is fix. Thanks everyone for the help
2011 Chevrolet Express 3500 6.0L steering box? VIN: 1GB0G2BGXB
I have swapped wheels and tires with another vehicle and problem solved. The tires I had put on 9 months ago have 30k miles on them and appear in good shape. They were mastercrafts..Thanks Nate
2003 Pontiac Grand Prix GT 3.8L MIL Lamp on VIN: 1G2WP52K23
thank you for all the help sorry took so long final findings after removing intake found tube for pcv was not properly installed re-installed and all is better appreciate all the help Trouble codes: P0171, P0174.
2001 Saturn SL1 1.9L No Start VIN: 1G8ZH52861
Thanks for the help , I did the 3 times 10 minute key on with the proper wait in between and the vehicle started and has been ok since. This is the first time for me that only one ten minute key on didn't work for this problem. Lesson learned!! posts were as f... Trouble codes: B2960, B2958.
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