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Ask Dominick Your Own Question
Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
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Dominick I have a 2005 135 Optimax with idle problems after running on plane and coming

Customer Question

I have a 2005 135 Optimax with idle problems after running on plane and coming to a stop. I have checked fuel pressures, replaced fuel filters, and yesterday installed new plugs all to specification. The motor runs very smooth in the beginning and after putting a load on it (on Plane 38-4-k) and coming to a idle it runs very rough and wants to stop completely. It starts fairly well but runs rough. I did check for water in the fuel but found none. Any ideas?
Submitted: 1 year ago.
Category: Boat
Expert:  Charles replied 1 year ago.
Hello, my name is***** you for allowing me to assist you today.
What did you get for fuel and air pressure?
Does the alarm system in the boat work?
Would you please post the serial number of the engine?
Customer: replied 1 year ago.
2002 Optimax
Serial Number OT484330
Low Pressure fuel 5-8 PSI
High Pressure fuel 80-88
Air Pressure 91-96
Customer: replied 1 year ago.
Yes the alarm works
Customer: replied 1 year ago.
How late are you online today?
Expert:  Charles replied 1 year ago.
I will be here until about midnight CST.
When you tested the air pressure, did you get any liquid at all from that port?
Customer: replied 1 year ago.
Expert:  Charles replied 1 year ago.
How is the acceleration of the engine? Smooth of sort of rough?
Has the flywheel cove been off for any reason recently?
Customer: replied 1 year ago.
The acceleration is just fine, very smooth. I am not sure what the flywheel cove is? Do you mean the cover which contains the air filter and connects to the air pump and throttle body? We did replace the belt but the symptoms were apparent before we replaced the cover.
Expert:  Charles replied 1 year ago.
Yes that was supposed to read cover.
Can you take it off then look at the throttle body. There should be a large rubber choke on it. It may also be stuck inside the cover.
Customer: replied 1 year ago.
I'll have to have mu son look at that probably tomorrow, thanks. *****
Expert:  Charles replied 1 year ago.
Sounds good Jim. Tomorrow I will be online after 530 PM CST. I spend my day in a busy repair shop.
Customer: replied 1 year ago.
Charles - The Grommet is in fact there.
Expert:  Charles replied 1 year ago.
That is good. If you can run the engine at home on a hose, with the cover off, start it and allow it to run for a few minutes, then wiggle the 2 wires coming from the crank position sensor on the right side of the engine. Let me know if the engine stalls or cuts out for a second.
Customer: replied 1 year ago.
Evening Charles - Well we did exactly as you asked and wiggled the wires from the Crank Sensor and it continued to run smoothly no stalls or cut out. Still trying to determine what the cause is.
Expert:  Charles replied 1 year ago.
Is there any chance that you can take a vid of the engine so that I can see it and hear it?
Customer: replied 1 year ago.
We will have to wait until this weekend and get her wet. I do have a short video on the trailer.
Expert:  Charles replied 1 year ago.
Is the motor messing up in that vid?Sent it and I will take a look.
Customer: replied 1 year ago.
No it is running smooth on the trailer. Will try and video this weekend.
Expert:  Charles replied 1 year ago.
Shoot it over, maybe I will hear something.

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