Originally Posted by
captain7829
I have a issue that everyone is having trouble to diagnosis. The motor is a 2014 Mercury 90 HP 4 stroke with 42 Hours. The issue started out around 20 Hours and has progressively became worst. The motor will hesitate for a brief second at full throttle and give a quick 1 beep alarm, like the startup beep. It doesn’t shut off and resumes like nothing every happened. It started out only doing it on the first run of the day and then would be fine the rest of the day. Then it got to where it was doing it all day and if it did it several times in a row it would give a five beep alarm after the 1 beep. I took it to a Mercury mechanic and he stated there was over 160 codes recorded and this is what we have done so far but the issue still exist:
1) New battery (I tried before I took to mechanic)
2) New relays (I tried before I took to mechanic)
3) New Throttle Position Sensor- the mechanic replaced this because all the codes lead to this issue. I took the boat out and the hesitation still exist at full throttle or coming out of full throttle. It didn’t store a code according to the mechanic.
4) Ran the boat with a remote wiring harness and ignition switch to rule out everything outside of the motor. The problem still exist.
5) All of the wiring on the motor has been looked over several times.
The hesitation happens randomly. It has done it at full throttle going straight on slick water, full throttle on choppy water, and it seems like it does it more as soon as you are coming out of throttle while turning slightly left or right. It also seems like it is back to doing it mainly on the first run of the day. It seems like if you cut the motor off after the first run and start it back it back up, it will not mess up sometimes. The mechanic is puzzled since it is not storing any codes but it hasn’t gave the 1+5 beep alarm yet since replacing the TPS. I haven’t ran it all day and pushed it to that point of making it alarm that much.
Thank you for any assistance.