PCM Excalibur 330 missing at ~2500 RPM

[elr]

My boat was running rough and not getting to speed so I did a complete service - cap (mounting ear on distributor cracked so I added a repair plate), rotor, plugs, wires, fuel filters, oil change, new impeller.  It still ran rough and did didn't get to top speed.  Changed low pressure fuel pump and changed the cap again.  Now I'm getting to top speed but have an occasional miss at 25 and 27 MPH -- all other speeds seem smooth.  Any ideas? @Jody_Seal

[UWSkier]

Does that model have an Ignition Control Module?  On a Vortec-based Indmar, that'd be the first place I'd look.  Then check fuel pressure is within spec.  Then coil.

[buechsr]

Same engine, same symptom here.  Crank position sensor did the trick.  '08 excalibur

 

[2Valve]

@elrWhat year? Multi-Port? Throttle Body? If you need a ICM, I have plenty from a previous round of trouble-shooting.

[elr]

@2Valve 2007 Multi-port, parts manual shows a RA117011 Ignition Coil/Module assembly

[2Valve]

2 hours ago, elr said:

@2Valve 2007 Multi-port, parts manual shows a RA117011 Ignition Coil/Module assembly

Mine wouldn't work. They're from a 2002 TBI equipped Vortec 350.

[cacman]

I had the same issue on a 2007. They hooked it up to computer adjusted cam retard.