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Prev Professional Automotive Repair Technical Discussions for January 9, 2010
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Open Help Requests for GM
Help Request Answers
1991 Cadillac DeVille 4.9L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1G6CD53B1M
The OEM Cat was broken core-Replaced with Magnaflow. Customer came back after DIY tune up. after retrieve code 52, captured running data. Tested EGR manually and with alternate vacuum supply and it functions, but the load is 99% with ignition off, KOEO, KOER... Trouble codes: 52 (ECM Long-Term Memory Has Been Reset)
1999 Chevrolet S10 4.3L none VIN: 1GNDT13WXX
this vehicle is failing the smog check because the monitors won't set for evap, cat, or air injection. No codes runs good, ASM test on Dyno are great. I only need one of these monitors to set for this to pass smog, but which one is the cause? All systems are w...
2005 Chevrolet Impala 3.4L Steering VIN: 2G1WF52E45
The power steering pump makes growling noise,pump has been replaced 2 times.We have installed gm power steering fluid both times about three months later comes back again same noise.power assit still fine looked at the lines for leaks none found.checked steeri...
1996 Pontiac Grand Am SE 2.4L Stall VIN: 1G2NE12T2T
Hello, I have a 96 pontiac in my shop brought in for a complaint of intermitant engine stall at what is described as a totaly random occurance, hot, cold, idle and cruise. The customer stated that when it happens the security light flashes and will normally r... Trouble codes: B1021

Fixes & Summaries for GM
Fix/Summary Answers
2005 Buick LaCrosse CX 3.8L MIL Lamp on VIN: 2G4WC53275
Had to replace the AIR pump, its was working but was weak. The P2440 code has nothing to do with O2 sensor or relays. During the test for this code, the valve is shut closed and pump turned on. It builds up pressure in AIR tube, wants to see a set amount of p... Trouble codes: P2440 (Sec. A.I.R. Valve Stuck Open).
1994 Chevrolet K1500 5.7L tcc lock-up VIN: 1GCEK14K5R
well i had some great replies to this one and i learned a lot first a 4l60e with a pwm will work in a older truck where it dont have a pwm it is just blocked off and will be a harsh engagement but you can use the 93-94 converter and it will work great secon...
2003 Chevrolet Silverado 1500 4.3L theft system VIN: 1GCEC14X23
Saturday morning ran the flow chart for the 2958 and as suggested in one reply I used a connector view to figure out wire colors. As I suspected was getting no signal from yellow wire to BCM, so I disconnected the 2 Bulldog boxes and unhooked the yellow wire a...
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