Jeep 1979 CJ-5 Technical & Service Manual page 45

1A-8 GENERAL SERVICE AND DIAGNOSIS
Service Diagnosis—Performance (Continued)
Condition
Possible Cause Correction
(9) Faulty spark plug(s).
(9) Clean or replace spark plug(s).
(10) Leaking engine valves.
(10) Check cylinder leakdown rate or
compression, repair as necessary.
( I D Faulty coil. (11) Test coil and replace as necessary.
F A U L T Y H I G H
S P E E D O P E R A T I O N
(1)
(2)
Incorrect ignition t i m i n g .
Defective T C S system.
(1)
(2)
Adjust timing.
Test T C S system; repair as
necessary.
(3) Faulty distributor centrifugal
advance.
(3) Check centrifugal advance and
repair as necessary.
(4) Faulty distributor vacuum
advance.
(4) Check vacuum advance and repair
as necessary.
(5) Low fuel p u m p volume. (5) Replace fuel pump.
(6)
Wrong spark plug gap; wrong plug. (6) Adjust gap; install correct plug.
(7) Faulty choke operation.
(7) Adjust choke.
^ FAULTY HIGH
SPEED OPERATION
(Continued)
(8) Partially restricted exhaust
manifold, exhaust pipe, muffler
or tailpipe.
(8) Eliminate restriction.
(9) Clogged vacuum passages.
(9) Clean passages.
(10) Improper size or obstructed
main jet.
(10) Clean or replace as necessary.
(11) Restricted air cleaner.
(11) Clean or replace as necessary.
(12) Faulty distributor rotor or cap.
(12) Replace rotor or cap.
(13) Faulty coil.
(13) Test coil and replace as necessary.
(14)
(15)
Leaking engine valve(s).
Faulty valve spring(s).
(14) Check cylinder leakdown rate or
compression, repair as necessary.
(15) Inspect and test valve spring
tension and replace as necessary.
(16) Incorrect valve timing.
(16) Check valve timing and repair as
necessary.
(17) I n t a k e manifold restricted.
(17) Remove restriction or replace
manifold.
(18) Worn distributor shaft. (18) Replace shaft.
70334C