chrmaka
I'm Awesome
- Joined
- Jan 11, 2015
- Messages
- 276
- Reaction score
- 57
Okay guys, on my truck its misfiring really bad and I'm unsure why. I have good compression across the board. Twin aeromotive 340's in the tank and it's holding a consistent 62 psi of fuel pressure. There is no new codes but the misfire does not happen at idle or WOT. Has full power and idles fine. its missing at light throttle around 2500 rpm and gets worse after the motor has reached operating temp.
These were replaced last summer:
Crank sensor
fuel lines
Fuel Filter
ICM
These have been replaced within the last 3 months
Plugs
Wires
Coil
Distributor
And I just replaced the MAP and spider unit today as well, I went to a ported factory MAF that I know that works with no change as well. On the tuning side I've reverted to a tune that's as close to factory as possible (factory timing and slightly more fuel than factory) with no luck. Before I swapped the MAP and spider unit out my plugs were showing signs of detonation from the other unit going bad. If time and weather permits tomorrow I'll pull the ones I threw in today and update. Before I did all this my truck was undriveable because of the bogging, misfiring, and backfiring. Now its drivable but my cruising RPM band is missing and occasionally backfiring now.
What I need to know is if there's anything else that I could be forgetting that could cause this misfire?
These were replaced last summer:
Crank sensor
fuel lines
Fuel Filter
ICM
These have been replaced within the last 3 months
Plugs
Wires
Coil
Distributor
And I just replaced the MAP and spider unit today as well, I went to a ported factory MAF that I know that works with no change as well. On the tuning side I've reverted to a tune that's as close to factory as possible (factory timing and slightly more fuel than factory) with no luck. Before I swapped the MAP and spider unit out my plugs were showing signs of detonation from the other unit going bad. If time and weather permits tomorrow I'll pull the ones I threw in today and update. Before I did all this my truck was undriveable because of the bogging, misfiring, and backfiring. Now its drivable but my cruising RPM band is missing and occasionally backfiring now.
What I need to know is if there's anything else that I could be forgetting that could cause this misfire?