INTERMITTENTS
Definition: Problem occurs randomly. May or may not store a Diagnostic Trouble Code (DTC).
DO NOT use the diagnostic trouble code charts for intermittent problems, unless instructed to do
so. If a fault is intermittent, incorrect use of diagnostic trouble code charts may result in replacement
of good parts.
Most intermittent problems are caused by faulty electrical connections or wiring. Perform careful
check of suspected circuits for:
1.
Poor mating of the connector halves or terminals not fully seated in the connector body (backed
out or loose).
2.
Improperly formed or damaged terminals and or connectors. All connector terminals and con-
nectors in problem circuit should be carefully reformed or replaced to insure proper contact ten-
sion.
3.
Poor terminal to wire connection (crimping).
An intermittent may be caused by:
1.
Electrical system interference caused by a sharp electrical surge. Normally, the problem will oc-
cur when the faulty component is operated.
2.
3.
Improper installation of electrical options, such as lights, ship to shore radios, sonar, etc.
Improperly routed knock sensor wires. Wires should be routed AWAY from spark plug wires, igni-
tion and charging system components.
4.
5.
Secondary ignition shorted to ground.
Arching at spark plug wires, spark plugs or open ignition coil ground (coil mounting brackets).
Part of internal circuitry shorted to ground such as in starters, relays and alternators.
If a visual/physical check does not find the cause of the problem, the EFI system can be tested with
a voltmeter or a scan tool connected while observing the suspected circuit. An abnormal reading,
when the problem occurs, indicates the problem may be in that circuit.
Index
5C-116 - ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY)
90-823224--2 796
| 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 |
(4 votes, average: 4.5 out of 5)
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Manuals are all Important for Technician
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