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Problem
Rough Idle (Cont.)
Engine will not idle
unless the boost pump
is on
12-30
Page 76
Table 1 (Cont.)
Fault Isolation Guide
Cause
Cracked engine mounts or
defective mount bushings
Engine mount bushing
incorrectly installed
Engine mount bushing
incorrectly installed
Low fuel pressure
Uneven cylinder
compression
Ignition leads
Fault in the ignition
system
Fuel vaporizing in lines
YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
Corrective Action
Replace in accordance with
airframe and part
manufacturer's instructions.
Install in accordance with
manufacturer's instructions.
Install in accordance with
manufacturer's instructions.
Replace fuel pump or fuel
pressure regulator.
1. Complete the cylinder
compression check.
2. Complete the borescope
inspection of low
cylinder(s) to determine if
further disassembly and
repairs are necessary.
Make sure all ignition leads
are secure.
1. Remove the distributor
block and examine leads
using a high-tension lead
tester.
2. Repair or replace
components as necessary.
3. Remove spark plugs,
examine, clean, gap, test,
and replace as necessary.
1. Operate with cowl flaps in
the FULL OPEN position
and keep ground operation
to a minimum.
2. Operate with boost pump
on as necessary.
3. Complete the check of the
vent return line for
blockage. Clean if
necessary.
© 2021 Avco Corporation. All Rights Reserved
Ref.
OHM
72-30
IOM
February 2021
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