Low RPM Misfire/Hesitation Issue
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I was constantly tripping a P0300 code and it turns out that running dual springs for the valves can cause symptoms like a large cam.
The solution is to "open up" the miss fire tables.
In your case, I think you have a throttle body problem as you can get the problem to appear if you throttle it slowly.
You don't say whether your motor is modded or not.
The solution is to "open up" the miss fire tables.
In your case, I think you have a throttle body problem as you can get the problem to appear if you throttle it slowly.
You don't say whether your motor is modded or not.
What do you mean by throttle body problem? Before I replaced the plugs and wires, I did find the air tube running to the throttle body was not tightened 100% and was loose. I re-tightened it. Doubt anything got in there though.
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Thank you for the explanation. Any way I can test the throttle body motor to see if it isn't operating correctly? Or do I need the GM hand held diagnostic tool?
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If you can get it on a good scanner you will be able to view the TPS signal live, that would allow you to view the voltage the computer is seeing from the TPS during wot or part throttle conditions...that's the best way I have found to rule out the throttle body unit, I'm pretty sure iac and TPS are all integrated in the tb unit...def try disconnecting egr like the other guy said that will let you know if ur egr solenoid is bad
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you need to eliminate the simple things first.
Last edited by 1ltcap; 02-02-2012 at 08:54 AM.
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Brought my car to the shop. The mechanic called me with the diagnosis. Two faulty coils. #7 and #4. He confirmed it with his GM handheld. He also checked fuel pressure among other things and it was fine.
When I called to confirm that the car was done, the mechanic told me that when he replaced coil # 7, his hand held reader showed no more faults. Apparently #7 coil was reverberatting causing the other to coil to look bad. So he only charged me for one coil and labor.
Car runs perfect now, so I'm happy.
When I called to confirm that the car was done, the mechanic told me that when he replaced coil # 7, his hand held reader showed no more faults. Apparently #7 coil was reverberatting causing the other to coil to look bad. So he only charged me for one coil and labor.
Car runs perfect now, so I'm happy.