Flying High
Well-Known Member
- Joined
- Aug 28, 2009
- Messages
- 612
- Reaction score
- 59
I've had some ongoing problems with my fuel servo so I finally sent it in and had the whole thing gone over with a fine tooth comb. The servo setup was rich and it was adjusted and a few seals replaced by a very reputable workshop in the USA. I put it back on the aeroplane and now I can't get the darn thing to idle without misfiring and popping, in-fact it misfires anything below 1200RPM and hesitates and puffs black smoke on power application. Above that its smooth as and runs fine.
Also as I lean it out to check the idle shutdown RPM rise, I get 200rpm rise just before it shuts off. I've had the mixture wheel all the way lean on the servo and it still does it.
I've bottle flow checked the nozzles, checked all the ignition including the plugs, checked for intake leaks and still can't figure it out. I did the centre body seal check that is described in the precision airmotive RSA troubleshooting guide and that seems fine.
Funny thing is before it would idle fine but the mixture was all over the place when making power, now it's the other way around.
Any ideas?
Also as I lean it out to check the idle shutdown RPM rise, I get 200rpm rise just before it shuts off. I've had the mixture wheel all the way lean on the servo and it still does it.
I've bottle flow checked the nozzles, checked all the ignition including the plugs, checked for intake leaks and still can't figure it out. I did the centre body seal check that is described in the precision airmotive RSA troubleshooting guide and that seems fine.
Funny thing is before it would idle fine but the mixture was all over the place when making power, now it's the other way around.
Any ideas?
