FUEL INJECTION SYSTEM TROUBLESHOOTING
SERVICE MANUAL NUMBER 23
Hesitation, Sag, Stumble Symptom (Continued)
1.
Remove spark plugs and check for
wet plugs, cracks. wear, improper
gap, burned electrodes or heavy
deposits.
•
Refer to Distributor Ignition System.
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 9
1.
Check for the ECT sensor shifted in
value.
2.
Check for intermittent opens or short
to grounds in the ECT sensor, MAP
sensor and TP sensor circuits. Also
check or throttle linkage sticking,
binding or worn.
9
3.
4.
An intermittent failure may not store
a DTC.
If a problem is found, repair as nec-
essary.
Go to OBD
System
Check
Was a problem found?
-
-
Go to Step 10
1.
Check for engine going into rpm
reduction mode.
Not
Applicable
to MerCruis-
er
10
11
2. If a problem is found, repair as nec-
essary.
Was a problem found?
EFI or MPI Go to Step 11
1.
2.
3.
Check for proper alternator voltage
output.
The voltage should be between spe-
cified values.
If a problem is found, repair as nec-
essary.
Go to OBD
System
Check
11-16
Volts
Was a problem found?
Go to Step 12
Go to Step 13
1.
Check for faulty or incorrect thermo-
stat.
12
13
2. If a problem is found, repair as nec-
essary.
Go to OBD
System
Check
Was a problem found?
-
-
1.
Check intake valves for valve
deposits.
2.
If deposits are found, remove as
necessary.
Go to OBD
System
Check
Were deposits found on the intake
valves?
Go to Step 14
Index
Page 5D-20
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...