First, thanks for any help.
I've got a O-320 w/ MA-4SPA carb that is giving me fits. Runs perfect, except for a nasty habit of flooding intermittently at idle. It's been thru 3 carb repair shops, some multiple times, and it still floods occasionally. Mechanical fuel pump was replaced about a year ago, 6 psi at idle, 2 psi at full throttle (.5-8 psi is the allowable range IIRC).
The main symptom of this is a slowly decaying idle while taxiiing. If I turn the fuel selector off the idle almost immediately recovers, back on and it starts decaying again. Hit a bump or taxi a bit and it stops misbehaving. Or starts doing it again. Pretty sure not getting needle seating well enough intermittently but nobody has been able to fix it.
The carb was upgraded to the new blue float (which is pretty much when all this $hit started), and alignment is perfect, needle/seat have been replaced 3 times I believe, still no relief. I can go complete flights without this behavior and then other flights it does it on taxi out and after landing.
Thoughts? Thanks again.
Jon
I've got a O-320 w/ MA-4SPA carb that is giving me fits. Runs perfect, except for a nasty habit of flooding intermittently at idle. It's been thru 3 carb repair shops, some multiple times, and it still floods occasionally. Mechanical fuel pump was replaced about a year ago, 6 psi at idle, 2 psi at full throttle (.5-8 psi is the allowable range IIRC).
The main symptom of this is a slowly decaying idle while taxiiing. If I turn the fuel selector off the idle almost immediately recovers, back on and it starts decaying again. Hit a bump or taxi a bit and it stops misbehaving. Or starts doing it again. Pretty sure not getting needle seating well enough intermittently but nobody has been able to fix it.
The carb was upgraded to the new blue float (which is pretty much when all this $hit started), and alignment is perfect, needle/seat have been replaced 3 times I believe, still no relief. I can go complete flights without this behavior and then other flights it does it on taxi out and after landing.
Thoughts? Thanks again.
Jon