FUEL INJECTION SYSTEM TROUBLESHOOTING
SERVICE MANUAL NUMBER 23
Rough, Unstable, or Incorrect Idle, Stalling Symptom (Continued)
1.
Check integrity of the primary and
secondary wiring.
2.
3.
Check routing of the wiring.
Check condition of IC module,
pick-up coil, distributor cap, rotor
and spark plug wires.
If a problem is found, repair as nec-
essary.
5
6
4.
Go to OBD
System
Check
Was a problem found?
-
-
Go to Step 6
Go to Step 7
1.
Check ignition coil for cracks or car-
bon tracking.
2. If a problem is found, repair as nec-
essary.
Go to OBD
System
Check
Was a problem found?
1.
Remove spark plugs, check for wet
plugs, cracks, wear, improper gap,
burned electrodes or heavy depos-
its.
•
Refer to Distributor Ignition System.
7
8
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.
Go to OBD
System
Check
Was a problem found?
-
-
Go to Step 8
Go to Step 9
Check the injector connections. If any of
the injectors are connected to an
incorrect cylinder, correct as necessary.
Go to OBD
System
Check
Was a problem found?
1.
Disconnect all injector harness con-
nectors and install an injector test
light J 34730-2 between the harness
terminal connector of each injector.
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.
2.
9
3.
If a problem is found, repair as nec-
essary.
Go to OBD
System
Check
Was a problem found?
-
-
Go to Step 10
1.
•
Check fuel injectors.
Refer to Injector Balance Test in
“General System Diagnostics” sec-
tion.
If a problem is found, repair as nec-
essary.
10
2.
Go to OBD
System
Check
Was a problem found?
Go to Step 11
Index
Page 5D-24
90-861326--1 MARCH 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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Marine readers have rated Mercury MerCruiser GM V8 GM V8 454 CID 7.4L and 502 cid 8.2L Marine Engines Service Manual Number 23 5.0 out of 5.0 based on 1 product reviews. Just need the manual. Wrote review. Can't technically review what I haven't seen yet...