95 sea ray 200 signature v8 bogs rpms over 3k

MICHAEL CASE

New Member
Jun 14, 2018
3
Boat Info
1995 sea ray 200 signature
Engines
220hp io mercruiser alpha drive
Sorry for the long story
Hi guys new to boats and posting.
Trying to grasp this internet thing.
Given a 95 sea ray which sat for 10 years.
So I first Emptied fuel tank.
Sloshed with small amount of fuel and emptied. I then filled tank with new premium fuel and added sea foam. Changed the plugs distributor cap and rotor. Had carborator rebuilt. I installed a new water separator,had bellows, risers,exhaust baffles,exhaust rubber exit hoses, out drive serviced impeller replaced,oil change installed new battery. Turned key fired right up.
But when i get rpms above 3k . Engine bogs and back fires.
Any ideas.
 
backfiring thru the exaust or intake can be a bad valve/sticking valve .
Compression test results?
 
I haven't done a compression test yet.
I hope the mechanic at the marina last fall did the compression test before charging for all the other repairs. That would be expensive i think, if a cylinder is junk. I would think the boat is pretty much to if compression loss.
I cant get it to hesitate or back fire in the driveway only in the lake. When its under a load.
Thanks for the suggestion. Ill attempt that tomorrow.
 
if you get the back fire issue resolved, I didn't see mention of your fuel lines, on my '94 200 they were due for replacement when I got her. Different configuration though.
 
Does the engine have a Thunderbolt ICM? If so the motor will run fine under 3500 to 3000 rpms but once you accelerate past that it will bog down. The module controls the timing after that 3000 mark and makes things seem to be a fuel issue while in reality it is a timing issue.

If this turns out to be the problem I would recommend replacing the system and not just the module. Modules cost into the $100's while a complete new system runs about $300 to $400. Harden has the system on sale now.

Good luck with her
 

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