optimax starting problem

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bobec

Cadet
Joined
Jun 29, 2008
Messages
24
I have A question about an optimax 2000 135hp saltwter. The motor cranks over good starts but dies immediatly. Also new 1000 cca bat. and good fuel pressure 87psi. & 77psi air at the rail.What's next! Any help would be great..
 
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jhebert

Ensign
Joined
Jul 24, 2005
Messages
903
Re: optimax starting problem

Insert an in-line spark tester into the spark plug lead for a cylinder. Verify there is spark. Test all cylinder with this method.
 
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blackbox

Seaman
Joined
Feb 24, 2009
Messages
74
Re: optimax starting problem

three things: #1 the e.c.u needs 9 +- volts when cranking or it will start and then stall. #2 your air rail presure may read o.k-cranking because of cylinder compretion presurizing the air rail the first cuple revolutions but the air pump may not provide the air neede to keep running. try using "shop air/compressed air" at air pump inlet (80 psi max) as you crank motor. if the motor starts and runs chk. the air pump reed block. #3 if the spark plugs are older than 2-3 hundred hr. replace with new "iz" spark plugs if using the older "pz" plugs. good luck!
 
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bobec

Cadet
Joined
Jun 29, 2008
Messages
24
Re: optimax starting problem

Thanks for the input jhebert and blackbox.I will give it all a try this weekend.And I will post the findings.Thanks again!
 
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bobec

Cadet
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Jun 29, 2008
Messages
24
Re: optimax starting problem

I'm back -first I used a digital multimeter on battery and when cranking it only dropped to 11volts.So I tried shop air on the air rail and same thing.I had already installed new NGK plugs before I posted my first question.I also did a compression test 120 psi all cylinders.If anybody has any other checks it would be greatly appreciated.It has me stumped::confused:
 
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blackbox

Seaman
Joined
Feb 24, 2009
Messages
74
Re: optimax starting problem

SORRY MY TIPS DID NOT HELP! i will try listing some other things that may help. #1 good quality fuel??? try fresh gas from a 3 or 6 gal. portable tank, and flush the system at fuel rail pressure fitting as you cycle the key switch and pump the primer ball, keeping the vapor seperator full. spin-off the fuel filter and dump in glass jar to chk. quality. #2 are you loosing spark??? use a timing light to monitor ignition. #3 can you keep the motor running if you advance the throtle? monitor air rail pressure #4 the spark plugs must be one of two: NGK-IZFR5G= new recomendation
NGK-PZFR5F-11= old plug
did the motor run o.k till you put in new spark plugs? (sorry to ask, but this has happend in the past) #5 chk. for fuel in the air rail. (possible blown tracker valve diaphram) #6 any codes? (need merc. software or ddt)#7 try an other key switch and wire harnes assembly. (there could be continuity between the blk.-yellow wire and any other wire in the harness or the motor is not geting clean voltage from the "key-on" circit on the purple wire. also chk. the fuses. sorry if you already did the basics i listed. good luck!
 
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bobec

Cadet
Joined
Jun 29, 2008
Messages
24
Re: optimax starting problem

Its me again but I have good news-It ended up being the ignition switch. After all the good ideas blackbox had I checked everyone of them. The switch in the run position I did not have power to the purple wire. Which as you know powers everything. I want to again thank Blackbox and everyone that gave me any input in the bringing to life my OPTI. THANKS AGAIN THIS IS A WONERFUL SITE WITH GREAT PEOPLE!!!:)
 
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