Mercruiser 4.2L IDI 220, smoke and low power issues

Markrhoyt

Cadet
Joined
Sep 1, 2011
Messages
20
Hi all, Can anyone give me an idea as to why my CMD 220 smokes so much with the manual cold start lever in the off position?
It does not smoke at all if it is left in the cold start position, but as soon as I flip it off, it smokes like crazy.
Also, the engine runs alot smoother with the cold start in the on position too.

I am also having a power problem. It won't turn up past 2500 rpm. I have a couple freinds who have the exact same boat, same engine, same outdrive, same gear ratio, same prop, and they can turn up to 3600 and do 22-24 mph, but i can only do 9-10 mph.
Any ideas??
Engine sounds beautiful, boost pressure is within specs, no black smoke, turns up to 4000 in neutral.
 
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