Ford Corsar Repair Manual page 298

TROUBLE DIAGNOSES
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KA24E
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Diagnostic Procedure 3
-
Unstable Idle
U i B
1.
Perform "POWER BALANCE"
2. Is there any cylinder which
does not produce a momen-
tary engine speed drop?
OR
When disconnecting each injec-
tor harness connector one at a
time, is there any cylinder which
does not produce a momentary
engine speed drop?
Yes
CHECK INJECTOR.
1. Remove crank angle sensor from
Check injector(s) and
circuit(s).
I
I
engine. (Harness connector should
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L I
remain connected.)
2. Disconnect each ignition wire.
3. Turn ignition switch ON. (Do not start
engine.)
4.
When rotating crank angle sensor
shaft, does each injector make an
operating sound?
Yes
El
l
CHECK IGNITION SPARK.
1. Disconnect each spark plug cap.
2. Connect a known good spark plug to
each spark plug cap.
3. Place end of spark plug against a
suitable ground and crank engine.
4. Check for spark.
. .
+
(Go to
@
on next page.)
Check ignition coil, power
transistor unit and their
circuits. (See page ES-179)