05-30-2017 06:52 - edited 05-30-2017 06:55
I am assuming that you mean the motor will not increase rpm when you advance the throttle lever. If that is the case then either the control box or throttle linkage is not allowing the the throttle-plates and throttle position sensor to rotate or the TPS is not responding to the throttle movement.
There could also be an intermittent connection somewhere in the TPS wiring and connectors. Not only that but the TPS link to the throttle plates may be suspect.
With the diagnostic software and a laptop, a technician can monitor the TPS voltage as the throttle is advanced and also test if there is a "dead spot" in the TPS.
05-30-2017 01:10 - edited 05-30-2017 01:11
Do these engines have the optional digital electronic shifting and throttle systems installed or the traditional push-pull throttle and shift cables and controls?
You did not furnish a model number
Has the technician run the boat with the diagnostic software and laptop hooked up and monitored?
This system is an I CON system so we have no moving linkages, all actions are done by wire up to the shift actuator and throttle actuator. We have swapped actuator and the problem did not follow, we replace the the actuators on problem engine, still same problem. We have change all wiring from engine to binnacles, replaced the binnacles, replace ESM, replace hubs. Essentially we have done a complete re rig from front to back. Only common factor left is that engine.
Not only does this engine not want to go sometimes, it also sometimes does not want to idle down to 500 rpm but stays at 900 and not go out of gear.
The high rpm idle problem is likely a linkage problem or something sticking or binding. Ask your dealer to check the TPS operation and resistance and to see if service bulletin 2014-02(S) applies to your motor.
Also for the shifting they may want to refer to bulletin 2012-04(S)