SERVICE MANUAL NUMBER 30
TROUBLESHOOTING
Engine Cranks Over But Will Not Start Or Starts Hard
Important Information
1.
2.
3.
First, determine which engine system is causing the problem. To make an engine oper-
ate fuel, spark (ignition) and compression are required. If all three components are pres-
ent, the engine should run. If any one of the three are missing, weak or out of sync engine
will not run.
Check ignition system operation. Remove spark plug wire from coil pack. Hold spark
plug wire near ground and check for spark while cranking engine over. Repeat proce-
dure with each spark plug wire. If there is spark at the spark plug wires, remove the spark
plugs and ensure that they are correct type and heat range, and not fouled or burned.
Run a compression check on engine.
Fuel System Rich
Cause
Special Information
Clogged flame arrestor
Excessive fuel pump pressure
Fuel pressure regulator defective
Fuel System Lean
Cause
Special Information
Empty fuel tank
Fuel shut-off valve closed (if equipped)
Vapor lock
Engine will not start after warm engine
shut down
Miscellaneous
Cause
Low grade or stale fuel
Water in fuel
Special Information
IAC Faulty
INDEX
90-863161 SEPTEMBER 2000
Page 1C-5
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 496 CID |
| Model Year | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(2 votes, average: 4 out of 4)
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