FUEL INJECTION SYSTEM TROUBLESHOOTING SERVICE MANUAL NUMBER 23
Page 5D-24 90-861326--1 MARCH 1999
Rough, Unstable, or Incorrect Idle, Stalling Symptom (Continued)
5
1. Check integrity of the primary and
secondary wiring.
2. Check routing of the wiring.
3. Check condition of IC module,
pick-up coil, distributor cap, rotor
and spark plug wires.
4. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
6
6
1. Check ignition coil for cracks or car-
bon tracking.
2. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
7
7
1. Remove spark plugs, check for wet
plugs, cracks, wear, improper gap,
burned electrodes or heavy depos-
its.
•
Refer to
Distributor Ignition System.
NOTE: If park plugs are gas or oil fouled,
the cause of the fouling must be deter-
mined before replacing the spark plugs.
2. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
8
8
Check the injector connections. If any of
the injectors are connected to an
incorrect cylinder, correct as necessary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
9
9
1. Disconnect all injector harness con-
nectors 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
connector. If test light fails to blink at
any one of the connectors, it is a
faulty injector drive circuit harness,
connector or terminal.
3. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
10
10
1. Check fuel injectors.
•
Refer to
Injector Balance Test in
“General System Diagnostics” sec-
tion.
2. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
11
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