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Power loss

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bjt

New member
after about 2 hrs of boating t

after about 2 hrs of boating tubing my 4.3L mercruiser bogs down in neutral runs fine but in gear it wont go over 2k
 
"Need more info.
Smoking, ove

"Need more info.
Smoking, overheating, missing, recent service, fresh fuel, spark OK, compression test, etc, etc????

Rod"
 
I changed oil plugs filter out

I changed oil plugs filter outdrive fluid new full tank hi-test runs great for 2hrs than loses power. can throttle in neutral but not w/load let it sit for an hour and sometimes your good to go for another 2hrs sometimes not
 
"Sounds suspiciously like an i

"Sounds suspiciously like an ignition issue.
One suspect is ignition coil breaking down after it heats up, but realistically 2 hours of use is a long time.
How about plug wires?
Is your fuel tank vaccuum locking? Is the vent line unrestricted?

Rod"
 
"Rod:

I am inclined to go w

"Rod:

I am inclined to go w/the coil failure. I carry a spare. Buy, beg or borrow a coil for the day to see if that cures it.

What does the dist. cap and rotor look like when this happens? Heat expansion of a hairline crack in the cap or the optic sensor under the rotor. If it is heavily rusted it could contribute to your problem but more on a "no start" issue.

Remove, clean and tighten all your ignition 12 volt wires at the coil and the module ground. Check the module connections for tight fit.

Put a timing light on the crank when this occurs and see if you are getting any advance. If not, more likely the amplifier module is failing under a heat condition.

You can get a can of "circuit cooler" at Radio Shack to spray the module with to rapidly cool it and see if it gets back to normal. Spray it liberally to chill it. If it does; new amp. module is $400."
 
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