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High manifold pressure at idle

1. Improperly adjusted fuel injector or carburetor. Adjust idle mixture to get a 25 to 50 rpm rise when moving mixture control from full rich to idle cut-off. Continental TSIO-360 engines should get a fifty to 100 rpm rise.
2. Incorrect hydraulic lifter's installed.
3. Hydraulic lifter's bleeding down too rapidly.
4. Air leak in induction system. Engine will be lean and rough at idle. Induction system leaks can be found by using a vacuum cleaner and a soap and water solution. Blow air into the induction system and look for bubbles. With mixture control at "IDLE CUT-OFF", ignition switch at "OFF" and throttle open, brush soap lather around tube joints and carburetor mount flange, one at a time, and turn propeller backwards to check for bubbles at points of leakage.
5. Inaccurate manifold pressure gauge.
6. Leaks in manifold pressure line.
7. Pipe plug missing from cylinder.

 It is highly recommended by aviators still alive that a pilot take advantage of ALL the runway US Navy "Flat-Hatting Sense" 1944

 

 
 



 

 


 

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Disclaimer: sacskyranch.com contains abundant information relating to aircraft maintenance. The information provided  is not intended to supercede or supplement the F.A.A. approved  maintenance and/or operator’s manuals. Those F.A.A. approved manuals must be utilized when performing maintenance and/or operating aircraft.