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PostPosted: Wed May 31, 2017 9:49 am 
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Minnow

Joined: Sun Dec 07, 2014 5:21 pm
Posts: 19
I have nagging issue with my port motor and hoping someone in here can help, they are 7.4 Gi's. I advance the throttles to get on plane, both motors come up nicely, then about 3-4 seconds after moving the throttles, around 3k RPM the port motor loses power like its starving for fuel. I can bring both engines back to idle and it will do this over and over. the engine never stalls. I can also hold it about 15-1800ish and it will run forever like that.. as soon as I give it any more load, bluuuuh...

Port motor has 43psi at idle and 48psi under full load when this happens. low pressure pump is 7psi. I even swapped them starboard to port to see if there was a volume issue, nope.... filters are new. check valve is clear, in fact ive pounded out the ball in the valve on this side. Tried a new ignition coil. nope again. distributor is brand new along with module and pickup..

I have a fairly strong automotive background but this thing has me stuck... It feels like fuel or maybe some protection mode? Can I get a data stream out of this DTC connector? I believe I read somewhere you can check codes by rigging up an LED light?

I appreciate any help guys. Thanks Mike.


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PostPosted: Wed May 31, 2017 2:11 pm 
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Shark

Joined: Tue Oct 27, 2015 7:52 am
Posts: 139
Location: Huntsville, AL
Try swapping distributor cap to verify all contacts are good and no internal break.

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PostPosted: Wed May 31, 2017 10:57 pm 
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Joined: Wed Mar 03, 2010 8:15 pm
Posts: 913
Location: NW Indiana
Wondering if a bad spot in the throttle position sensor might cause a problem like that, might be worth performing a sweep test of both sensors and compare. Have you checked spark plug burn conditions, do they look like its running lean?

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