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Vmax 200hpstalls at 500 to 800 rpms

hookem2

New member
"Any help would be appreciated

"Any help would be appreciated.

On my Vmax- Ox66- 200 hp, I am having a problem with low end rpms around 500 to 900 rpms. Boat is running great on the top end. I took it to a good shop and we replaced the inline fuel filter, fuel filter inside the engine cover, cleaned the VST filter, cleaned the O2 sensor, and replaced the 3 low end fuel pumps. We checked for air leaks and found none.
We did a compression check and engine has about 700 hours and is still in range on compression.

The engine will start and when I run about 500 to 900 rpms, the engine "hick ups" and will stall out. After I get over the 900 rpm mark, the boat runs fine.

The mechanic gave up!

Any advice where to start?

Hookem"
 
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