TROUBLESHOOTING WITHOUT A DIAGNOSTIC CODE - CONTINUED
Table 1. Engine Troubleshooting - Continued.
TEST OR INSPECTION
N OT E
Consumption - Continued.
It is not necessary to swap the injector trim files for this temporary exchange
of two injectors. Injectors must be properly installed and adjusted for this
7. Use MSD to perform Cylinder Cutout
1. If misfire problem stays with the
suspect injector, replace the suspect
Temporarily swap suspect injector
injector and install new trim file for it
(WP 0187 00).The other good injector
injector from a cylinder that is not
that was moved must first be returned
misfiring (WP 0187 00).
to its original position or its trim file
must be moved to its new location.
2. If the cylinder cutout test indicates the
misfire continues to be in the same
cylinder, the suspect injector is not the
problem. Return the injectors to their
original position or move the trim files
to the new location. Investigate other
possible causes of misfire for the
problem cylinder, check valve lash
(WP 0179 00).
3. If problem still exists, go to Test 8.
8. Remove valve cover (WP 0024 00) and 1. Make any necessary repairs.
oil pan (WP 0181 00). Check for worn 2. If problem still exists, go to Test 9.
cam lobes, lifters, or push rods for the
misfiring cylinder. Check for
9. Inspect air filter for restriction.
1. If needed, clean or replace air cleaner
2. If problem still exists, go to Test 10.
10. Check the air intake and exhaust
1. Remove any blockages or restrictions
system for restrictions and/or leaks
and replace damaged air intake and
exhaust system lines or hoses (WP
2. If problem still exists, go to Test 11.
11. Check all accessory equipment for
Repair or replace any damaged
problems that may create excessive
load on the engine.
1. Check engine compartment for leaks.
1. Repair any leaks that are identified.
Excessive Engine Oil
2. If problem still exists, go to Test 2.