4.3 runs good until warmed up...

[63 Nova]

What happens when a coil starts to go bad? I have an 89 4.3 mercruiser in a Sea Ray 200 BR which has no power at WOT once the engine reaches operating temp. It runs perfect until it is fully warmed up. I have changed fuel seperator, plugs, temp is fine, no water in the oil. Any ideas?

 

[Skipster1]

Re: 4.3 runs good until warmed up...

Hey Nova.... you need to re-post this with specifics.<br />The folks who might help you only look for problems they know about, so "what happens when....." just isn't specific enough to do you good.<br />You'd be better off using as a title, something like: "My 4.3 Merc has no power at WOT but runs good until warmed up."<br />Using this new title you will attract a bunch of good folks who know all about 4.3 Merc engines.<br />So go ahead and re-do the posting using this kind of title... it don't cost nothing and the results will amaze ya.

 

[achris]

Re: 4.3 runs good until warmed up...

Nova,<br /><br />This is a long shot but check it anyway. <br /><br />When I bought my 4.3 it would loss about 5 knots and 500rev when warm. Very long story short, as the block and distributor warmed up they lost good electrical contact. Made the dissy electronics change the timing curve. Ran a ground wire to the dissy body and haven't had a problem since.<br /><br />Chris...........