MerCruiser 305 CID (5.0L), Руководство по обслуживанию

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FUEL INJECTION SYSTEM TROUBLESHOOTING
SERVICE MANUAL NUMBER 24
90-861327--1 OCTOBER 1999 Page 5F-7
Surges and/or Chuggles Symptom
Step Action Yes No
PROCEED TO
Definition: Engine power variation under steady throttle or cruise. Feels like the
engine speeds up and slows down with no change in the throttle lever position.
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 fuel filters and water separator.
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. 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.
2. An intermittent failure may not store a DTC.
Was a problem found?
OBD
Step 6
6
1. Check for proper ignition voltage output.
•
Refer to Table A-7 in “General System
Diagnostics” section.
Was a problem found?
OBD
Step 7
7
1. Check ignition coil for cracks or carbon
tracking.
Were cracks or carbon tracks found? Step 8
8
1. Check integrity of the primary and second-
ary 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 necessary.
Was a problem found?
Step 9
Index