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1991 Mercruiser 4.3 Litre

SaskGuy

New member
Having a problem with my boat. At about 4000 Rpm and up, If I give it full throttle it hesitates then goes and hesitates and goes and I can hear popping noise coming from my carb. It ran fine the week before now this. I have replaced fuel filter and water seperator. New plugs wires cap and rotor. Also took carb apart and cleaned it. When I decided to time it ( Thunderbolt IV) I got 0 degrees BTDC at idle. It idles fine starts easy and has lots of power up to the hesitation point. Any help would be great guys. Thanks
 
We did a fuel pressure test and runs at about 7Psi I was thinking of pulling up floor to check that Valve. You wouldnt think timing as its out by 8 degrees. I figured if out that far it run more like crap !
 
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