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I have twin 225, ox66, efi. Intermittant Problem is with port engine. Starts fine, idles fine, when getting up on plane, will run fine to about 3000 rpm, when the boat planes off at say 3500, the port engine seems to quickly lose some power (like one cylinder not firing) and the tach, rpm's go to zero on the meter....first time it happened I thought the engine cut out....but I know what it feels like running with just one engine and its clearly running two engines, just losing some power.
I would not say it surges like you get with a fuel issue, but its almost like the cylinder will fire and you can feel slight bursts and the tach may go up a bit, to say 1600 rpm, and then back to zero....almost like a switch on/off
when I back off the throttle, to say 1800 rpm, the tach will kick back up and i'm fine at 2000...
but its intermittant....that's happened twice the last two times out, but each time after it happened, I ran idle for a while, and then kicked up the throttle and I ran for 30 mintes at 4100,, and WOT with no problems
I'd like to understand what/where the tach is measuring, to go down to zero, engine still running, and then jump back up when I back off the throttle.
I would not say it surges like you get with a fuel issue, but its almost like the cylinder will fire and you can feel slight bursts and the tach may go up a bit, to say 1600 rpm, and then back to zero....almost like a switch on/off
when I back off the throttle, to say 1800 rpm, the tach will kick back up and i'm fine at 2000...
but its intermittant....that's happened twice the last two times out, but each time after it happened, I ran idle for a while, and then kicked up the throttle and I ran for 30 mintes at 4100,, and WOT with no problems
I'd like to understand what/where the tach is measuring, to go down to zero, engine still running, and then jump back up when I back off the throttle.
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