FUEL INJECTION SYSTEM TROUBLESHOOTING
SERVICE MANUAL NUMBER 24
90-861327--1 OCTOBER 1999
Page 5F-15
Cuts Out, Misses Symptom
Step
Action
Yes
No
PROCEED TO
Definition: Steady pulsation or jerking that follows engine speed, usually more
pronounced as engine load increases. The exhaust has a steady spitting sound at
idle, low speed or on hard acceleration for fuel starvation that can cause engine to
cut out.
1
Was the “On-Board Diagnostic” (OBD)
System Check performed?
Step 2
OBD
2
Was visual/physical check performed?
Step 3
Visual/ Physical
Check
3
1. Check for contaminated fuel.
2. Check water separating fuel filter.
Was a problem found?
Step 4
4
1. Check for proper fuel pressure while the
condition exists.
•
Refer to Table A-4 in “General System
Diagnostics” section.
Was fuel pressure 30 psi for EFI or 3–7 psi
for carbureted engines?
Step 5
5
1. Disconnect all injector harness connectors
and install an injector test light J 34730-2
between the harness terminal connector of
each injector.
2. Crank engine and note light on each con-
nector. If test light fails to blink at any one of
the connectors, it is a faulty injector drive
circuit harness, connector or terminal.
Was a problem found?
Step 6
6
1. Check fuel injectors.
•
Refer to Injector Balance Test in “General
System Diagnostics” section.
Was a problem found?
Step 7
7
1. Check for proper spark at each cylinder.
Was a problem found?
OBD
Step 8
8
1. Check the spark plugs for the following:
•
Insulator cracks.
•
Improper gap.
•
Burned electrodes.
•
Heavy deposits.
NOTE: If spark plugs are gas or oil fouled, the
cause of the fouling must be determined before
replacing the spark plugs.
Were spark plugs damaged?
OBD
Step 9
Index
