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Gilligan

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1993 Sea Ray 300

Posted: Aug. 21 2006,9:40 am

Post # 1

SO far I seem to have a weak engine. They both run way better then they did in the beginning and after changing out the fuel filters the boat will plane better. However one engine seems to loose power after it warms up. It could be running at 4200RPM while the other is pushing 4600RPM. Then out of the blue it will drop down to 3600RPM and the boat will slow down. The good running engine seems to have a responsive throttle any time I tweek the throttle. But the engine in question has a spongy like throttle. It does not seem to react as well once it hit 4200 RPM. So far I cannot hear an engine miss but with 2 of them running it might be hard.
Now if you floor each engine individually in gear... the good engine will make it to 3200RPM when the weaker engine only gets to 3000RPM. Now you have to hold on because that makes the boat want to turn left or right. :beat

My mechanic thought it might be an ignition coil??? He thinks it could be weak and says that will make the engine sluggish and down on power. :phone

Anyone have any problems like this before?

1993 Sea Ray 300
Twin 4.3L 205HP engines. :pirate

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GoFastRacer Male

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Posted: Aug. 22 2006,5:33 am

Post # 2

What kind of ignition system are on the motors??, weak ignition can cause the problems you're having for sure, how about the plug wires and plugs, have they been replaced recently??.. :stupid

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Gilligan

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Posted: Aug. 22 2006,6:09 am

Post # 3

Quote (GoFastRacer @ Aug. 22 2006,5:33 am)

What kind of ignition system are on the motors??, weak ignition can cause the problems you're having for sure, how about the plug wires and plugs, have they been replaced recently??.. :stupid

It was tuned up in 05 and not really used (cap rotor plugs). I believe it to have the thunderbolt system. I have no idea on the plug wires.

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weldwade

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Posted: Aug. 22 2006,6:35 am

Post # 4

New plug wires and plugs are relatively inexpensive and worth the piece of mind. I change wires every other year and plugs every year. I would also check the power wire to the ignition, general condition of the wire and connections. Pull the dist cap and check it and the rotor. May be as simple as carbon tracking inside the cap. I am very anal about ignition and donâ€™t like to waste power or gas so I keep mine as fresh as possible :good

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GoFastRacer Male

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Posted: Aug. 22 2006,7:14 am

Post # 5

A "GOOD" set of wires can make a world of difference!.. :good

Maybe a censor is going away??.. :stupid

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TopCat

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Posted: Aug. 30 2006,9:54 pm

Post # 6

What color is the spark? Yellow would be a bad thing, whit or blue a good thing

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Gilligan

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1993 Sea Ray 300

Posted: Aug. 31 2006,4:07 am

Post # 7

Quote (TopCat @ Aug. 30 2006,9:54 pm)

What color is the spark? Yellow would be a bad thing, whit or blue a good thing

I do not know. I will have to check.

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Kim Hanson Male

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Posted: Sep. 02 2006,10:19 am

Post # 8

I just went through all this crap on holidays, relay was clicking--replaced that--starter just clicked next--replaced that--no fire yet--replaced main ignition box, cranked over just would not fire--replaced ingnition switch--now Im pissed off--last thing--coil ( coil was like new )....replaed fired right up--total cost was under $350.00 bucks and she rips hard again.........( . )( . )...........6 trips to town at 25 miles each way sucked big time though.. :cry

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GoFastRacer Male

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Posted: Sep. 02 2006,10:31 am

Post # 9

Process of elimination sucks huh!..

But just think, everything is new again!.. :good

Edited by GoFastRacer on Sep. 02 2006,10:32 am

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Kim Hanson Male

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Posted: Sep. 02 2006,10:42 am

Post # 10

Quote (GoFastRacer @ Sep. 02 2006,10:31 am)

Process of elimination sucks huh!..

But just think, everything is new again!.. :good

Ya that is the best thing about it and it was really cheap to replace it all..........( . )( . )..........While I was at it I replace the carb with a 750 double pumper and what a difference that made........ :good

Look at life through the windshield, not the rear-view mirror."
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GoFastRacer Male

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Posted: Sep. 02 2006,9:20 pm

Post # 11

Quote (Kim Hanson @ Sep. 02 2006,10:42 am)

While I was at it I replace the carb with a 750 double pumper and what a difference that made........ :good

Yeah and you pay for it in gas mileage too!..

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Gilligan

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1993 Sea Ray 300

Posted: Sep. 05 2006,4:16 am

Post # 12

Boat runs good now!!! :jumpie

I also noticed the timing was set on 4 Deg BTDC so I bumped it up to 8 Degs and gained some big top end RPM!! :good

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GoFastRacer Male

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Posted: Sep. 05 2006,5:29 am

Post # 13

Glad to hear you got it fixed!. :good

Amazing what a good tune up can do!.. :good

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12 replies since Aug. 21 2006,9:40 am

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