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Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
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2001 200hp/hpdi 2 stroke, in neutral, rpm drop when throttle

Customer Question

2001 200hp/hpdi 2 stroke, in neutral, rpm drop when throttle advanced
In gear , runs normally
Submitted: 11 months ago.
Category: Boat
Expert:  Jeff G. replied 11 months ago.

When in neutral and idle your engine cuts out two cylinders, one from each bank. There is a switch on the bracket next to the end of the shift cable at the engine. Are you having a particular problem other than this?

Customer: replied 11 months ago.
If I try to advance throttle in neutral, rpm drops and engine quits, this is new, in gear , it will rev up but not with same power as before
Customer: replied 11 months ago.
what does that switch do, can it help solve the problem?
Expert:  Jeff G. replied 11 months ago.

You need to do a spark test of all 6 cylinders. 2 cylinders are disabled in neutral. If you have lost one or even two other cylinders then you will have problems like you describe. If you rev the engine too high in neutral the ECU will further cut cylinders with over rev protection.

You can get a spark tester at any auto parts store. Do the test and post back which cylinders are not firing.

The switch disables the cylinders to save fuel at slow speeds.

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