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I did test all the ignition wire with one of those ignition wire testers. I believe it only checks for shorts to ground but does not check for opens. I'm sure all the wires are in the right place or ...

Thanks Old Bob. Good advice. I am aware of Service Bulletin SB03-3 and have read it. Turns out that I mistakenly reported my problem as being 5 intake leaks, when in fact, air was leaking thru the ...

Problem Found! I did a second compression check and took my time. Although all of the compressions are in the low to mid 60's, it appears that each cylinder has a valve leak, one exhaust and 5 intakes ...

Problem Found! I did a second compression check and took my time. Although all of the compressions are in the low to mid 60's, it appears that each cylinder has a valve leak, one exhaust and 5 intak ...

It runs rough on either mag. It's not bad at 1700 RPM, just at lower RPM's around 900-1100. Single mag operation drops around 75-100 rpm on either mag.

Runs rougher with mixture full rich, better ...

Both mags were inspected, a new distributor block was installed on one due to a corroded terminal, and returned to the plane. I only did a brief compression check to see if anything really bad happen ...

I have verified that all the hose clamps are tight and that all the intake bolts are secure, but not sure where else to look and how to determine if it's leaking.

Thanks.

Thanks Tim and Dan. Yes, it smooths out quite a bit when I lean it out (about two inches of throttle position) but still misfires. I did clean the injectors with Hoppes #9 gun cleaner but no change. ...

I have an IO-520BB in my Beech Bonanza that runs rough at idle and low RPM. I have changed the spark plugs, cleaned the injectors, checked the mag timing (just installed after 500 hour inspection and ...

I have an IO-520BB in my Beech Bonanza that runs rough at idle and low RPM. I have changed the spark plugs, cleaned the injectors, checked the mag timing (just installed after 500 hour inspection and ...