2006 merc optimax 75 HP no fire
 

Running along, zero problems and died. Will not fire at all. Yes, kill switch is engaged lol

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sorry to say but that sounds like your ECM died, big $$$ unless you can find a used one on ebay

If it wont turn over check the fuse next to the starter.

Turns over fine just no fire.

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wonder if the kill switch didnt crap out?


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[QUOTE=jldsc;697259]wonder if the kill switch didnt crap out?


i think that happened to bassyakr

Yep common problem with em.

How do you bypass the kill switch?

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pull the cowling off...there should be 2 wires plugged into the kill switch fairly close to it....just unplug it and check to see if you have fire


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the tether kill switch


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I'll get him to do that today. My sons boat he just bought.

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Before jumping into splicing a safety feature of a boat why not check over some obvious items.
1. Is there are audible warning horn going off when you turn the key to run position?
2. With the cowl off can you hear the fuel pump prime when you turn the key to the run position?
3. Check to make sure all of your fuel lines and air hoses are connected and haven't blown off the fitting.(sounds crazy but I had my opti kill like yours once and it was only the air compressor line to the fuel rails coming loose.)
4. Check all of your onboard fuses
5. There is a website called bbcboards.net I think. There is a wealth of optimax troubleshooting knowledge in there.

Thanks for the link. No alarms, fuel pump is priming, haven't check hoses, fuses are good.

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Oh and the splice would just be temporary.

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Will the engine not fire at all now?
Have you verified the vst is in fact getting fuel?
fuel bulb is firm and not collapsed
Not out of gas

No warning horns huh?

2006 merc optimax 75 HP no fire
 

you dont have to splice anything...just unplug it...its a factory plug in put there to be able to replace it...dont splice anything yet


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He pulled plugs. They are wet, so getting fuel. Checked spark, plugs showed fire. Bulb is firm. Fuel, fire while plugs out and won't even act like it wants to start. No idea!

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You might also look at your air compressor. U can pull the belt and rotate the compressor pulley to listen for any clanking.

All just shots in the dark.
Also check your kill switch like someone said. Verify all your connections are secure to kill switch

Thanks for the info. He actually changed kill switch this morning. I'll mention the compressor. Think he's about to take it to Jerry's.

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if he has fire at the plugs it isnt the kill switch...probably somethin a little more detailed


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Let jerry take care of it but post up the results.

I will post up results

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possible crankshaft sensor if it goes out then you will not have any spark at all on ay plugs

He will be bringing it in the morning.

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Does it have compression on all cylinders. If it has good compression then it's a electrical prob could be a bad stator, plug will still get fire mine did it 2 weeks ago.

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Any word from Jerry yet?

Nothing yet. My son dropped it off this morning. Hopefully it won't take too long.

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Just heard from my son. Said jerry called and said it was some sort of fuel module "vs2"? At any rate it was a fuel issue. Kinda odd plugs was wet. But a little over a hundred bucks and its fixed. Quick service at Jerry's. Big thanks.

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Probably VST. Its the unit that holds the water filter and also houses the high pressure fuel pump. Im curious to know what they changed. It wasnt the whole vst because they are pricey. Maybe blocked filter or something.

Not sure. Hopefully when he or I pick it up Jerry will be there and show us.

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