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500 EFI running rough

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500 EFI running rough

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Old 08-06-2018, 03:08 PM
  #1
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Join Date: Jul 2006
Location: Sandy Creek, NY
My Boat: 1990 Fountain Fever (SOLD) 1995 330 Sundancer
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Default 500 EFI running rough

We ran our boat 30 mins at 3200rpms, all gauges were fine the entire way to our stop. We slowed down to obey a wake zone and then started to run again at 4000rpm for 5 mins, all gauges were normal. Slowed down after those 5 mins to dock and lost the starboard engine. Engine would/will start hard but doesn’t sound like its hitting all cylinders. Any suggestions on where to start my diagnosis.
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Old 08-06-2018, 03:53 PM
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SB
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As with all engines:
Start with:
Scan for trouble codes
check/test ignition components (when you remove each plug get a good look for water/lean/rich/etc)
check fuel pressure
check compression all cylinders
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