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Troubleshooting
Engine Troubleshooting Guides
The following troubleshooting guide is provided to help you isolate a malfunction of one or more of your boat’s
systems. After determining which systems are affected by the malfunction, refer to the individual system trou-
bleshooting charts to isolate the specific cause.
This guide was written to help you trace the symptoms of the trouble to the source, without having to read through
and prove every possibility. Much of the information here will be familiar to well informed mechanics.
Also, many factors will seem insignificant but when you think of it, usually the toughest problem to troubleshoot
is caused by the smallest error. The greatest aid to solving a service problem is information. Start gathering
information and keep a detailed record of the symptoms of the malfunction. Keep a record of pertinent facts, such
as:
● When did this trouble start?
● How was the boat loaded?
● Did the trouble occur suddenly or did it become apparent gradually?
Whether servicing the boat’s systems yourself or having your product serviced by a certified Volvo Penta dealer,
you will need this record of information to identify potential causes of the malfunction.
Analyze this information and try to match it to similar situations you have experienced in the past. Keep in mind
the fundamental rules:
● COMPRESSION - Mixture inducted into cylinder and compressed.
● SPARK - Proper intensity at the proper time.
● FUEL - Proper mixture of air and fuel.
● EXHAUST - Clear of any obstructions.
Detonation (Spark Knock)
Detonation, or spark knock, is continually monitored by
the electronic fuel injection (EFI) system. The EFI’s
computer (ECM) will automatically alter spark advance
to help prevent engine damage if knock is detected,
and there will be a slight loss of power.
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