1flyingyogi
Well Known Member
I'm getting a lot of roughness/ vibration between 1100-1400rpms. It seems to be worse after the engine is fully warmed up and in hot weather. And worse in the air than on the ground. At start up (while engine is still cold/ cool), it's not bad at all. I feel it most after a flight and I'm coming in to land and need to throttle back. It's so rough at these RPMs that I have gotten in the habit of slowing down quickly so that I can get it below 1000RPMs so I don't have to experience this roughness/ vibration. I have tried playing with the mixture while on the ground at these RPM's to see if it makes a difference and it does not.
I have the Airflow Performance FM-150L Fuel Injection and EFII electronic ignition+1 mag. The electronic ignition was installed shortly after I bought the plane 2 years ago and I just finished installing the FI recently and have about 16hrs on it.
It runs great at idle and top end. Just very rough at these lower RPMs. Feels almost like a very out of balance prop. I saw a bit of fuel stain on one of the intake tubes near the gasket, so I thought an intake leak was causing this. I installed new gaskets on all tubes and while I was at it, I also replaced all the hoses that couple the intake tubes to the bottom of the sump. It did not help.
If I remember correctly, my plane always felt a *little* rough coming in to land (at low RPMs), but never this bad. So it probably is not a problem with the fuel injection. But I'm not sure... Any ideas or how to trouble shoot this??
Thanks.
I have the Airflow Performance FM-150L Fuel Injection and EFII electronic ignition+1 mag. The electronic ignition was installed shortly after I bought the plane 2 years ago and I just finished installing the FI recently and have about 16hrs on it.
It runs great at idle and top end. Just very rough at these lower RPMs. Feels almost like a very out of balance prop. I saw a bit of fuel stain on one of the intake tubes near the gasket, so I thought an intake leak was causing this. I installed new gaskets on all tubes and while I was at it, I also replaced all the hoses that couple the intake tubes to the bottom of the sump. It did not help.
If I remember correctly, my plane always felt a *little* rough coming in to land (at low RPMs), but never this bad. So it probably is not a problem with the fuel injection. But I'm not sure... Any ideas or how to trouble shoot this??
Thanks.