Notifications

Clear all

This Forum is a place for Piper Comanche pilots to communicate and discuss technical issues

If you join or reset a password, please check your Spam Email box for emails from Admin at ComancheTechTalk.com

Please put your questions on the forum as well so everyone can read and respond. Someone else might be having similar questions.

All questions or topics on the Forums automatically get sent to the Tech team as well.

Backfire?

Comanche Engines and Propellers

Last Post by ICS archives 2008-2018 4 years ago

1 Posts

1 Users

0 Reactions

112 Views

RSS

ICS archives 2008-2018

Admin

Joined: 5 years ago

Posts: 1162

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

Top

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