Tune-up

fechtk2

Cadet
Joined
Apr 30, 2023
Messages
11
Good Morning, i did a recent tune-up on my 3.0L merc (plugs,wires,rotor,cap) and now it runs terrible, does anyone have any idea why? thank you.
 

dubs283

Vice Admiral
Joined
Jul 27, 2005
Messages
5,322
Poor quality/incorrect components, timing off, firing order incorrect, carburetor adjustment, etc...
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
49,574
remember, if the distributor was ever removed, you will need to verify tower 1's location on the distributor. with motor at TDC on cylinder #1, the rotor will be pointing to tower #1
 

ThomW

Chief Petty Officer
Joined
Aug 8, 2016
Messages
615
I'd go with what Scott said. If you twisted the distributor while doing cap or rotor, the timing will be off. Or the plug wires got put on in the wrong order. Hopefully it'll be a quick and simple fix for you.
 
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