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Starboard engine from bridge, will turn over but won't start however it starts o.k. from lower station.

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  • scissors70 Mar 17, 2011

    There is apparent power because as I stated, the engine turns over but won't fire. What is the IAC ? These are 8.2 Detroits so is there a fuel shut-off switch that isn't working or do you think it is an electrical problem at the ignitikon switch ?



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Did you take it out of gear (push the black button on the throttle at the helm) and manually advance the throttle stick, resulting in you bypassing the IAC then try starting the engine? ----------- Do see the injectors fire when the key is first turned to the on position? Do you hear the fuel pump run,when the key is first turned to the on position? ----------- check if ignition is getting power.Try this :--- Run a jumper from the battery pos. to the coil pos. to ensure the ignition system is powering up.If there is no power then its ignition related problem.------- Check out this possibilities.Keep updated.Thanks.Helpmech.

Posted on Mar 17, 2011

  • raj somaiya Mar 17, 2011

    There is fuel shut off solenoid.
    If the solenoid is not stuck,then also it can be blocked or stuck up injector.
    The fuel shutoff solenoid works off power, so when the key is turned on the solenoid energises and allows the injectort racks to travel to the full fuel posistion. So if your engine is running away you have a stuck injector.To test if injector is working or getting stuck then try this:---
    Turn on ignition - hold throttle in full fuel then manually turn stopper , if one injector is stuck the stopper won,t move the throttle back to no fuel position .
    the iac means idle air control valve.Its located on throttle body.Try cleaning the throttle body with carb cleaner and see if that helps.If not then its stuck of fuel pump solenoid or short in ignition.The short in ignition is rare,as you mentioned the engine turns over but won't fire.But still if other possibilities checked ok then short in ignition has to be checked to confirm the possibility.-------------------This should help.Thanks.Helpmech.



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