SURGES
Definition: Engine power variation under steady throttle or cruise. Feels like the engine speeds up
and slows down with no change in the throttle control.
PRELIMINARY CHECKS
Perform the visual/physical checks as described at the start of “Troubleshooting Charts” section.
CHECK FUEL SYSTEM FOR:
1.
Fuel pressure to be within specification while condition exists.
CHECK IGNITION SYSTEM FOR:
1.
Condition of 4-terminal Ignition Control (IC) connector at distributor. Connector wires must not
be routed near spark plug wires.
2.
3.
4.
5.
6.
Intermittent ground connection on ignition coil.
Proper operation (advancing or retarding) of Ignition Control (IC).
Condition of distributor cap, rotor, and spark plug wires.
Proper and clean connection on distributor pick-up coil terminal.
Spark plugs that may be fuel fouled, cracked, worn, improperly gapped, burned electrodes, or
heavy deposits. Repair or replace as necessary.
CHECK SENSORS AND CONTROLS FOR:
1.
2.
Intermittent opens in Manifold Absolute Pressure (MAP) or Engine Coolant Temperature (ECT)
sensor grounds CKT 814. If intermittent for a very brief period, will not set DTC.
Intermittent short to grounds or opens in Manifold Absolute Pressure (MAP) sensor 5 volt refer-
ence CKT 416 and Manifold Absolute Pressure (MAP) sensor signal CKT 432. If intermittent for
a very brief period, will not set DTC.
Index
90-823224--2 796
ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5C-119
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
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