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#1
09-25-2006, 09:30 AM
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Dead Spot Around 3100 RPMs
My boat has a 1993 Ford 351 engine (Carburetor). It runs great except when I get into the 3100 to 3200 rpm range and then I hit a dead spot (runs extremely poor) once I get above 3200 rpms the engine runs well again.
Is this a carburetor problem or an ignition issue? Any suggestions would be greatly appreciated? skilew 
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#2
09-25-2006, 10:07 AM
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Not sure if it's related.....
A buddy had a similar issue on his 93 and chased if for a couple weeks...I think there is even a post on here for his...In his case it was the check valve out of the gas tank that was clogged...There is a 90 degree elbow on the top of the tank (where the fuel line comes out of the top of the tank) that and for some reason this was an issue for a couple folks on this site....He cleaned and flushed that and boat has run well ever since. Simple and worth checking before you go through anything else...
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92 PS 190, 351 HO
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#3
09-25-2006, 10:11 AM
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Interesting about the check valve. My boat has a flat spot at 2,175 rpms. If I run it there for a few seconds, the rpms will drop, then return repeatedly. You don't feel it under normal accelleration. I'd wondered if it was a vacuum leak.
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Previous: 1993 Prostar 205 Red 1998 Closed Bow Ski Boat, Ford 351, 310 hp, Acme 4 blade, Perfect Pass SG. FAQ Tyler Ski Club To me, this forum is about love of inboard boats. It is about the sharing of information and, on a good day, some humor. It is not about post count, brand of boat, or any other superfluous labels that lend themselves to a false sense of superiority. Please, respect one another, try to pass on accurate information, and keep your eye on the ball.
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#4
09-25-2006, 10:11 AM
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Here are the links to his issue...Good luck
Starving for fuel thread.... http://www.tmcowners.com/teamtalk/sh...ad.php?t=10801 Fuel pump thread... http://www.tmcowners.com/teamtalk/showthread.php?t=9783
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92 PS 190, 351 HO
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#6
09-26-2006, 02:17 PM
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How are your gaskets (don't know that this is a problem, but wondering since I suspect I may be due for a switch and it might be causing my flat spot).
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Previous: 1993 Prostar 205 Red 1998 Closed Bow Ski Boat, Ford 351, 310 hp, Acme 4 blade, Perfect Pass SG. FAQ Tyler Ski Club To me, this forum is about love of inboard boats. It is about the sharing of information and, on a good day, some humor. It is not about post count, brand of boat, or any other superfluous labels that lend themselves to a false sense of superiority. Please, respect one another, try to pass on accurate information, and keep your eye on the ball.
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#7
09-26-2006, 02:27 PM
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Does the 93 still have points?
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It's Snowing in the UP
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#8
09-26-2006, 02:31 PM
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Electronic ignition was standard in 93.
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Previous: 1993 Prostar 205 Red 1998 Closed Bow Ski Boat, Ford 351, 310 hp, Acme 4 blade, Perfect Pass SG. FAQ Tyler Ski Club To me, this forum is about love of inboard boats. It is about the sharing of information and, on a good day, some humor. It is not about post count, brand of boat, or any other superfluous labels that lend themselves to a false sense of superiority. Please, respect one another, try to pass on accurate information, and keep your eye on the ball.
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#10
09-26-2006, 08:22 PM
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Secondaries not opening properly
That 3100-3200 PRM range is where you secondaries are susposed
to open kikcking in the 4 barrels. Run the boat with the motor box open with the flame arrestor off and see if they are kciking in Jim@BAWS
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