motor replaced 3.0 rough idle

blueyecb

Cadet
Joined
Jun 28, 2010
Messages
6
ok guys an gals ...i pulled my old 3.0 out an put in a used complete motor ....i used my manifold,riser,carb an distributor motor starts an runs ...but i have rough idle ...i plan to replace points, cond , an cap this week end ...i sprayed around manifold an base of carb for leaks an didnt find anything ...tach isnt reading right but soon as i give lil gas it smooths right out an runs great ...carb was rebuilt by some one else right before i got the boat ...old motor had cracked block an blown head gasket (water in oil) anyone got any ideas ...i put new plugs in autolites are only thing i could get on sunday an im not real big on them so gona try an find more this week end....
 

glennwolf

Seaman
Joined
Jan 23, 2010
Messages
57
Re: motor replaced 3.0 rough idle

Did you compression test this new USED motor?
 

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,771
Re: motor replaced 3.0 rough idle

Idle mixture properly set? Once off the idle jets the carb is on intermediate and high speed jets which would account for the smooth running.
 

blueyecb

Cadet
Joined
Jun 28, 2010
Messages
6
Re: motor replaced 3.0 rough idle

thanks guys for reply found problem ...yes ran compressing test an was fine ....done that before i bothered putting it in ....problem was wires at coil ...took care of tach problem also
 
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