Piper Navajo Chieftain PA-31-350 Service Manual page 503

NAVAJO CHIEFTAIN SERVICE MANUAL
TABLE VIII-IV. TROUBLESHOOTING CHART (ENGINE
Trouble
Cause
Low power and uneven
Defective ignition wire.
running. (cont.)
Failure of engine to
develop full power.
Rough engine.
Defective spark plug
terminal connectors.
Leak in the induction
system.
Throttle lever out of ad-
justment.
Improper fuel flow.
Restriction in air scoop.
Improper fuel.
Faulty ignition.
Cracked engine mount.
Defective mounting
bushings.
Uneven compression.
Defective spark plugs.
0GINE) (cont)
Remedy
Check wire with electric
tester. Replace defective
wire.
Replace connectors on spark
plug wire.
Tighten all connections and
replace defective parts.
Adjust throttle lever.
Check strainer, gauge and
flow at fuel injector inlet.
Examine air scoop and re-
move restrictions.
Drain and refill tank with
recommended fuel.
Tighten all connections.
Check system with tester.
Check ignition timing.
Repair or replace mount.
Install new mounting
bushings.
Check compression.
Try new spark plugs.
Reissued: 9/23/80
POWER PLANT
2J16