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2002 opti shut down at approx 3500 rpm

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kdog1pjmyahoocom

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"I have a 150 optimax year 200

"I have a 150 optimax year 2002,engine shuts down at approx 3500 rpm consistently,it loses spark on all cylinders.Has been connected to a DDT and everything checks good even at time of shut down.Fuel and air pressure remain correct at time of shut down.Three air injectors have been replaced all connections are good on everything and no corrosion.Any Ideas????"
 
Thanks guys.Found the problem.

Thanks guys.Found the problem.It was either a somewhat clogged map sensor or a poor connection in the harness plug.I don't know which as I cleaned them both before running again.It now runs properly.
 
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