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GENEtU SERVICE AND DIAGNOSIS
Service Diagnosis - Performance (Continued)
Condition
Possible Cause
Correction
F A U L T Y H I G H
S P E E D
O P E R A T I O N
(Continued)
(16) Intake manifold restricted.
(17) Worn distributor shaft.
(18) Improper feedback system operation.
(16) Remove restriction or replace manifold.
(17) Replace shaft.
(18) Refer to Feedback System Diagnosis.
M I S F I R E A T A L L
S P E E D S
(1) Faulty spark plug(s).
(2) Faulty spark plug wire(s).
(1) Clean or replace spark plug(s).
(2) Replace as necessary.
(3) Faulty distributor cap or rotor.
(3) Replace cap or rotor.
(4) Faulty ignition coil.
(4) Test coil and replace as necessary.
(5) Primary ignition circuit shorted or open
intermittently.
(5) Troubleshoot primary circuit and repair as
necessary.
(6) Improperly seated valve(s).
(6) Test cylinder compression, repair as
necessary.
(7) Faulty hydraulic tappet(s).
(7) Clean or replace tappet(s).
(8) Improper feedback system operation.
(8) Refer to Feedback System Diagnosis.
(9) Faulty valve spring(s).
(9) Inspect and test valve spring tension, repair
as necessary.
(10) Worn camshaft lobes.
(10) Replace camshaft.
(11) Air leak into manifold.
(11) Check manifold vacuum and repair as
necessary.
(12) Improper carburetor adjustment.
(12) Adjust carburetor.
(13) Fuel pump volume or pressure low.
(13) Replace fuel pump.
(14) Blown cylinder head gasket.
(14) Replace gasket.
(15) Intake or exhaust manifold passage(s)
restricted.
(15) Pass chain through passage(s) and repair as
necessary.
(16) Incorrect trigger wheel installed in
distributor.
(16) Install correct trigger wheel.
P O W E R N O T U P
T O N O R M A L
(1) Incorrect ignition timing.
(2) Faulty distributor rotor.
(1) Adjust timing.
(2) Replace rotor.
(3) Trigger wheel loose on shaft.
(3) Reposition or replace trigger wheel.
(4) Incorrect spark plug gap.
(4) Adjust gap.
(5) Faulty fuel pump.
(5) Replace fuel pump.
806520
B-15
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Table of Contents
Troubleshooting
