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Prev Professional Automotive Repair Technical Discussions for April 25, 2015
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Open Help Requests for GM
Help Request Answers
2001 Chevrolet Silverado 2500 HD LS 8.1L No shift
Hey Gents I have a 2001 chevy HD 2500 with a 8.1 liter that was brought to me with a complaint of no shift and delayed engagement of transmission! found the following codes po500, po507, po700, p1336, p1571, u1024 stored. I know the po700 and u1024 are trans ...
2006 Pontiac Pursuit 2.2L MIL Lamp on VIN: 1G2AJ55F26
Vehicle runs normally but the o2 stays at around 900 mv except on decel after a hard acceleration. The long term numbers are around 0 and the short tern numbers do not vary more than 2 to 3 plus or minus . All the other sensor data appears normal, ect map, m... Trouble codes: P0340, P1133

Fixes & Summaries for GM
Fix/Summary Answers
1994 Chevrolet C3500 Cheyenne 7.4L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy, MIL Lamp on VIN: 1GBKC34N4R
Thanks to all for your replies. I tested voltage at the map and it was only 1.3 and the scanner was reading 3.2. searched high and low to find an ecm with prom finally found one stuck it in problem solved. 3 Trouble codes: 33 (Map sensor high), 45 (Exhaust rich).
1998 GMC C1500 Suburban 5.7L Power Door Locks VIN: 1GKEC16R1W
ALL 9[nine] replies were really informative & helpful...cust is a transient college student and I had to release veh back to him before I could look at it again! Hopefully I will have truck back in my shop within 2weeks so I can continue my repair attempt...B...
2003 GMC Yukon XL 1500 SLE 5.3L compressor not on VIN: 3GKEC16Z73
Thanks to everyone . Man of the widlerness was right on as most. The shop that repaired it used after market parts, using AC DELCO parts fixed it. Thanks to all
2005 GMC Envoy XL SLE 4.2L Hesitation VIN: 1GKET16S55
This one is finally fixed. Long story short, the exhaust camshaft phaser was the problem. Able to figure that out with the pico in cylinder pressure transducer kit. It showed a huge pressure spike of 23lbs at the end of the exhaust stroke. They had already dro...
1968 Pontiac GTO 6.6L transmission converter VIN: 242678P344
Thank you for all the replies to my post! David from Ohio (reply #3) suggested an ignition switch problem. This got me thinking as to whether the TCM was getting a clean source of power. I had previously tapped into the ignition switch terminal which lead...
2003 Saturn Vue 3.0L idle VIN: 5GZCZ63BX3
Used propane to check the intake and vacuum hoses for leaks. Determined that the plenum was drawing air. Removed plenum serviced throttle body and cleaned plenum. Replaced injector o-rings and all plenum gaskets. Tested and found no problems present. Thanks fo...
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