How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Jeff G. Your Own Question
Jeff G.
Jeff G., Marine Mechanic
Category: Boat
Satisfied Customers: 4724
Experience:  42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance
Type Your Boat Question Here...
Jeff G. is online now
A new question is answered every 9 seconds

I have a 2003 dt 150 efi Suzuki will go in gear thottle up

Customer Question

I have a 2003 dt 150 efi Suzuki will go in gear thottle up but not back down
Submitted: 2 years ago.
Category: Boat
Expert:  Jeff G. replied 2 years ago.
Welcome,this question may need more than a single answer. Please post back with additional questions on this at any time.
We will need to determine if it is the control, cable or linkage.
Remove the engine cover from the motor.
Engine OFF.
Have a helper shift the control to forward gear and slowly advance the throttle while you turn the propeller. This ensures engagement and allows full throttle. As the throttle advances is the link arm moving smoothly?
Look at the throttle body, the large opening into the engine in the front. The link arm has a socket on it that connects to a ball on the underside of the throttle body. As you move the throttle does the linkage on the throttle body move? Bring it back to neutral, does it move back to idle position?
If the linkages are ok, on top of the throttle body is a throttle position sensor, tps. This tells the "computer" the position of the throttle. It is held in place by two screws. Are the screws in place? Are they loose allowing the tps to move?
If they are loose or missing they need to be put back in or tightened and the tps set. If you look at the tps it is plastic and will have marks from where the screws were. For now that is close enough.
I have a feeling the tps is loose allowing it to rotate when it shouldn't this tells the computer it is advancing but not coming back to idle.
Check this and post back what you find.

Related Boat Questions