24Golf
Well Known Member
I have noticed this problem occasionally over the last few summers, but this year it has gotten really bad. After flying any amount of time (1 to 3 hrs or more), when I land and roll out to the fuel island to fill up, I pull the mixture to cutoff and the engine ALWAYS dies quickly (like it should). BUT, when I crank up and idle down to my hangar and kill the engine by pulling the mixture, I get a horrible "dieseling" that lasts for several seconds and is somewhat violent. This problem is obviously heat related, since it only does this in the summer. I have tried several things, none have helped:
Running the engine at 1500 RPM for several minutes to try to bring in cooler fuel.
Pulling the mixture to near cutoff for several minutes at low and high RPMs before cutoff.
Cutting off the fuel flow at the valve (made it worse).
Any ideas?? The engine is a factory Lycoming with just shy of 900 hours on it. The injection system is the Precision Airmotive EX-5VA1 and I am running 2 P-mags with all auto plugs and 100LL only.
Running the engine at 1500 RPM for several minutes to try to bring in cooler fuel.
Pulling the mixture to near cutoff for several minutes at low and high RPMs before cutoff.
Cutting off the fuel flow at the valve (made it worse).
Any ideas?? The engine is a factory Lycoming with just shy of 900 hours on it. The injection system is the Precision Airmotive EX-5VA1 and I am running 2 P-mags with all auto plugs and 100LL only.