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Topic ClosedPCM 351 Heat Soak

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SUPRA_COMP View Drop Down
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Joined: 15 July 2014
Location: Ontario, Canada
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Direct Link To This Post Topic: PCM 351 Heat Soak
    Posted: 15 July 2014 at 3:45am
Hey All

Having an issue with my '85 Supra and heat soak. Boat has a new motor and a recently rebuilt carb (about 4 years ago). Boat will run great from cold start but after the first run and a couple of ski passes it starts to bog down and get hot to the point where it won't get up on plane or idle. 

I have checked the anti-syphons valve, and fuel vent line for starters. I also re routed the fuel line as it was a tight connection between the pump and water separator and was tight to and touching the oil filter (have not tried to run it since) and also just ordered a new water separator for maintenance from the site. After the boat has cooled off for about 25-30 mins it will fire up and run flawless but the problem returns quickly. I usually run the blower all the time but it does not seem to help. 

Has anyone else had issues with heat soak? Is this my issue? What were your solutions?

Motor is a new re-man block and have just finished the stringers, foam and floor. 

Cheers

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Direct Link To This Post Posted: 16 July 2014 at 5:00pm
Had a conversation with Vince and he suggest the ignition coil might be the culprit.

I will be testing that out tonight!
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Direct Link To This Post Posted: 20 July 2014 at 8:31am
Well Vince was right.

The ignition coil that was installed on the boat was bad and also the wrong one. It was a 1.4 ohm resistance and it was also wired incorrectly. The coil was seeing all 14 v while operating which was causing it to overheat.

Went and bought an MSD blaster coil with 0.7 ohm resistance and re wired the new ballast resistor in. Put the boat in the water and it pulled harder than ever and didn't die once. Never saw more than 9.7 volts at the + side of the coil.

Thanks Vince!!
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