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Prev Professional Automotive Repair Technical Discussions for April 9, 2006
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Open Help Requests for GM
Help Request Answers
1995 Chevrolet Astro 4.3L Misfire VIN: 1GDDM19W5S
Hi everybody there,i have this van driving me crazy,van runs good in open loop,when goes to close loop oxygen sensor stays down to 220 mv.Purge control solenoid duty cycle is 99% at idle(not sure normal or not).The mechanic checked the distributor shaft for cr... Trouble codes: 66 (3-2 solenoid), 67 (torque coverter clutch solenois), 83 (torque converter quad drive)
1999 Chevrolet Malibu 3.1L Poor Idle Quality, Misfire VIN: 1G1ND52J1X
Hi Techs, 1999 Malibu 3.1L came in with an intermittant misfire at idle. Mifire is between 800 rpm up to 1800 rpm then she hits all cylinders. Below 800 rpm idle is smooth. Above 1800 (approx.) she runs smooth with all cylinders online. Good acceleration witho...
1995 GMC Jimmy 4.3L lifters VIN: 1GKDT00000
3 lifters were found to be collapsed, on all other lifters, the spring in which the pushrod sits are pumped up solid. the 3 collapsed were replaced. The engine has a steady ticking noise, which does increase with engine RPM.

Fixes & Summaries for GM
Fix/Summary Answers
1984 Cadillac DeVille 4.1L Excessive Emissions, Hesitation, Poor Fuel Economy VIN: 1G6AM478XE
Several responders said to check the MAP vacuum at the sensor, it was low and slow to react to throttle. I looked at the port under the TBI unit and found it plugged with carbon. Cleaned it and runs great now. Thanks to all that responded.
1989 Cadillac DeVille 4.5L power stays on VIN: 1G6CD5157K
Thanks for all the reply's some of you told me to do things that I posted I already checked The problem was in the drivers door controls someone jumped a wire from the seat switch to the window switch causing it to back feed
1996 Chevrolet Lumina 3.1L rocker arm VIN: 2G1WL52M3T
Hi Well I took the engine out of the car. The owner said she could not afford to buy another good car for the price of repairing this one. On complete tear down I could still find no reason for the rocker stud to pull out.On inspection I found no indication of...
1999 GMC Sierra 1500 SL 5.3L Lighting VIN: 1GTEC19T5X
I again explained to the customer how the system works, I think he now believes me. I called him and he said they appear to be working now he understands the operation of the lights.
1997 Pontiac Sunfire SE 2.2L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1G2JB1242V
ya well i miss wrote that describtion when i said 110 psi on compression. it was above 120 psi. but after another check i do have one cylinder a little under par. witch i believe to be the cause. told the customer that the motor is over the hill and will need ... Trouble codes: P0300.
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