Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 1464 / 1956

PAGE 6
Feb 28/07
7H18
77-20-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
Trouble Cause Remedy
75° - 100° rise for Spark plug not firing due to Check spark plug. Clean or
one cylinder. fouling, faulty plug, lead, replace if necessary. Check
or distributor in magneto. lead. Replace if necessary.
Check magnetos.
Repair if necessary.
75° - 100° rise for One magneto not operating. Repair faulty magneto.
ALL cylinders.
Increase or decrease, Improper timing - Increase in Check magneto timing.
especially after ignition EGT means retarded ignition.
system maintenance. Decrease means advanced
ignition.
Loss of peak EGT. Poor ignition or vapor in fuel Check magnetos. Repair if
injection system. necessary.
Purge fuel injection system
if necessary.
Decrease in EGT for Decrease in total airflow Check alternate air system.
ALL cylinders. carburetor ice or induction ice.
Decrease in EGT for Intake valve not opening Check valve lift.
one cylinder. fully - faulty valve lifter.
Scored cylinder or broken Check spark plugs. Clean
ring to cause low compression or replace if necessary.
(EGT may increase due to Check compression.
plug fouling from oil
consumption).
Slow rise in EGT. Burned exhaust valve. Check compression.
Decrease in peak and Detonation - usually the Check to make sure proper
flat. result of 80 octane fuel in octane fuel is used.
100 octane engine.
Sudden off scale rise Pre-ignition During takeoff - Abort if
for any cylinder. possible. Go to full rich.
Check fuel injector flow for
proper operation.
Any EGT decrease. If none of the above causes Check calibration with
is evident, suspect a low reading ALCOR System Tester.
probe or faulty connection.
Any increase in EGT. TROUBLE - because any Check probe & leads with
malfunction of probe, lead, or ALCOR System Tester.
meter will cause a decrease. Replace any found to be
faulty.
CHART 2
TROUBLESHOOTING COMBUSTION ANALYZER GAUGE
( S/N’s 4636001 thru 4636020 only )