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Backfire?

Comanche Engines and Propellers

Last Post by ICS archives 2008-2018 5 years ago

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ICS archives 2008-2018

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Topic starter 07/05/2020 3:16 pm

Backfire?

by Edward Rognerud » Tue Sep 11, 2012 9:48 pm

During the last 2 flights in our PA39, after flight while taxiing back to hangar, the right engine made a popping sound 2 to 3 times while at idle power. It sounded like a mild backfire. It has never happened before since we have had the aircraft. We just had both fuel selectors rebuilt. These were the first 2 flights since that work was done. Any ideas what may be causing this?

Ed Rognerud
Rosemount MN

Edward Rognerud

Posts: 21

Joined: Fri Nov 11, 2011 3:57 am

Location: Rosemount, MN KSGS

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Re: Backfire?

by Kristin Winter » Tue Sep 11, 2012 11:41 pm

First thing to do is check the idle mixture setting. Take it up around the patch enough to get full operating temp. Then with the engine at idle, and the boost pumps on (per Piper SM), bring the mixture back. You should see a slight drop in MAP and a slight rise in rpm just before the engine quits. If you don't, adjust idle mixture wheel on the fuel servo and try again.

Kristin

Kristin Winter