Mercury MerCruiser D2.8L D-Tronic Service Manual page 650

EDI DIAGNOSIS
Troubleshooting Charts (Continued)
CONDITION
SURGING
(SPEED
CHANGE)
ENGINE RPM
WILL NOT
REACH RATED
SPEED
Page 5E-82
POSSIBLE CAUSES
1. If the condition occurs at idle,
the idle speed is set too low for
the accessories.
2. High pressure fuel leak.
3. One or more injectors worn or
not operating properly.
4. Improperly operating injection
- pumps
1. Engine overload.
2. Improperly
tachometer.
3. Throttle linkage
incorrectly adjusted.
4. Inadequate fuel supply.
5. Air/fuel controls leak.
6. Improperly operating injection
pump.
7. Incorrect ECM part number
SERVICE MANUAL NUMBER 22
CORRECTION
1. Adjust the idle speed.
2. Inspect/correct leaks in the
high pressure fines. Fittings
and delivery valve sealing
washers.
3. Check/replace the inoperative
injector
4. Replace the injector pump.
1. Verify high idle speed without
load. Investigate operation to
operating
ensure correct gear is being
used.
worn or
2. Verify engine speed with hand
tachometer,
required.
3. Adjust linkage for stop to stop
fuel control
Replace linkage if necessary.
4. Check the fuel flow through
the system to locate the
reason for inadequate fuel
supply, correct as required.
5. Check and repair leak. Check
AFC tubing for obstruction.
6. Repair or replace injection
pump.
7. Ensure ECM part number is
correct for your model; some
derated ECMs are for dual
installations
regulated countries
90-860074--1 FEBRUARY 2002
correct as
lever travel.
in emission