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Old 09-16-2014, 10:32 PM
Laurel_Lake_Skier's Avatar
Laurel_Lake_Skier Laurel_Lake_Skier is offline
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Join Date: Aug 2004
Boat: 1996 FlightCraft
Location: Wisconsin
Posts: 860
It might be worth checking to see that your valves are opening fully on the #4 cylinder. Since you swapped out heads, I'd assume you checked the valves for correct clearance on all cylinders but if #4 is has clearance that is excessive you could still see good compression and leakdown test results. Since the valves aren't opening enough (or at all) air/fuel mix won't get into the cylinder or exhaust can't get out.

You might also check that you are actually getting a spark at the #4 plug. Although you checked the cap and plug itself, the wire might be broken or grounding out.
1996 FlightCraft Barefooter—Merc 200 EFI
1991 ProStar 190—Acme 475, GT40-P heads, Edelbrock Performer intake, Mallory YLM Ignition
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