Merc 135 Optimax stalls then won't start

lakeguy72

Cadet
Joined
Feb 14, 2003
Messages
14
I have a 2000 135 optimax that runs rough in neutral 2000-2600 rpm then stalls abruptly(after about 4-5 minutes) and is hard to restart. If i wait awhile it starts and then shuts down again. If running @ 700 rpm there is no problem and it runs smooth. The engine runs so poor that I can't get away from the dock to power it up. Fuel filter was changed, new squeeze bulb, fresh gas--nothing has worked.<br />Thanks
 

John from Madison CT

Petty Officer 2nd Class
Joined
Oct 14, 2001
Messages
176
Re: Merc 135 Optimax stalls then won't start

Oh yes, another fine fine product by Mercury Marine.<br /><br />You should check with a dealer to be sure all the proper updates on this engine were done.<br /><br />This is key. Unless you are proficient in Optimax technology, I would have a dealer work on her.<br /><br />john
 

hondon

Lieutenant Commander
Joined
Jun 11, 2001
Messages
1,922
Re: Merc 135 Optimax stalls then won't start

Do'es that battery meet the hefty requirements that this engine demands and are those terminal ends tight and sparkly clean? Something to think about before toodleing off to the dealer.
 

upstate

Seaman Apprentice
Joined
Dec 4, 2002
Messages
32
Re: Merc 135 Optimax stalls then won't start

she's starving for fuel i think.
 

Mufasa

Petty Officer 2nd Class
Joined
Jan 9, 2003
Messages
109
Re: Merc 135 Optimax stalls then won't start

Lakeguy, The '00 135 Opti-max is a good motor. It is very complicated and you can ceate trouble by tampering with it. The motor requires a DDT tool to talk with the ECU. It should start and idle just fine, do not leave it at 2,500 rpms just to keep it running. I suspect a MAP sensor has failed and it is in a default mode just to allow you to return to port. Find a reputable dealer who is familure with this product.
 
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