back fire

[den912]

my 2.2 seems to backfire and pop a bit the distributor and leads seem to be fine I think, can this be down to low compression? If so what does it take to fix this? Is it a big job to fix?

[Flat6pac]

The backfire through the carbs is indictative of lean running or bad cam timing.
Bruce

[GrantG]

Originally Posted by den912

my 2.2 seems to backfire and pop a bit the distributor and leads seem to be fine I think, can this be down to low compression? If so what does it take to fix this? Is it a big job to fix?

Are you using MFI? If so, maybe your fuel-shutoff function is not working properly (the one triggered by the microswitch when throttle returns to idle position, but revs are still above idle).

[tom1394racing]

Backfire at partial throttle with carbs is often caused by plugged idle jets.

I ran my tank too low the other day and they plugged with moisture. Pulled them out, blew them out with compressed air. Problem solved.