Need some ideas
05-20-2010, 02:03 PM
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Need some ideas 00 Hawk 6spd
Issue: under load at about 2500 rpms car starts bucking will backfire and shutdown. Sometimes the car will power through it and will pull hard to redline. I have replaced the cam and crank sensors and had the crank sensor relearned.
Here is where it stands as of yesterday.
Had car on lift to try to duplicate problem. Car worked fine so it seems it will not show up unless under heavy load. We pulled starter and crank sensor to check reluctor wheel it didn't move. We checked the wiring on the ignition system they were good. Used the tech 2 to check the injectors flow rate all fine fuel pressure is right where it should be. Swapped pcms with a friends car. There were a few gm updates so flashed my pcm. Pretty much we are about the point of dropping the engine out tearing it apart to see whats wrong. There is no metal in the oil. Only 2 other thoughts we have atm is a cracked/cracking spring is sticking and causing a crossfire or possibly cam walk. Someone has to have seen something like this before.
Issue: under load at about 2500 rpms car starts bucking will backfire and shutdown. Sometimes the car will power through it and will pull hard to redline. I have replaced the cam and crank sensors and had the crank sensor relearned.
Here is where it stands as of yesterday.
Had car on lift to try to duplicate problem. Car worked fine so it seems it will not show up unless under heavy load. We pulled starter and crank sensor to check reluctor wheel it didn't move. We checked the wiring on the ignition system they were good. Used the tech 2 to check the injectors flow rate all fine fuel pressure is right where it should be. Swapped pcms with a friends car. There were a few gm updates so flashed my pcm. Pretty much we are about the point of dropping the engine out tearing it apart to see whats wrong. There is no metal in the oil. Only 2 other thoughts we have atm is a cracked/cracking spring is sticking and causing a crossfire or possibly cam walk. Someone has to have seen something like this before.
05-20-2010, 10:12 PM
#3
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Any DTCs?
Also did you check the length of the wiring harnesses for the sensors you replaced for damage? I know I had wiring to my CPK burned on the headers, the car did pretty much the same thing you're describing now.
Also did you check the length of the wiring harnesses for the sensors you replaced for damage? I know I had wiring to my CPK burned on the headers, the car did pretty much the same thing you're describing now.
