I am having rough starts on a Lycoming IO-540. sometimes it is a real bear to start and sounds like it isn't running on all cylinders. Once it gets into the higher (1500 rpm) range it seems to smooth out. The compression has always been good (78/80) and is run a lot every month. After cleaning the injector nozzles it seems to run better but still not how it should. One opinion offered was that it is the fuel control unit but nothing to support why. I really hate to throw a new control unit at an unknown. Another odd quirk is that when leaning in cruise in the higher altitudes (7-9,000 or so) the fuel flow will show down to about 0 on the manual fuel flow indicator.
Any ideas?
What kind of problems would a faulty fuel control unit offer?
What would problematic fuel divider act like? Is it possible to have "morning sickness" and always have great compression on the cylinders.
Most times the compression tests are done cold and the engine has about 800 hrs. on it. It is generally run to about 60 hrs. per month and the oil is changed at 50 hr. intervals.
Any ideas?
What kind of problems would a faulty fuel control unit offer?
What would problematic fuel divider act like? Is it possible to have "morning sickness" and always have great compression on the cylinders.
Most times the compression tests are done cold and the engine has about 800 hrs. on it. It is generally run to about 60 hrs. per month and the oil is changed at 50 hr. intervals.