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05-05-2019, 08:50 AM #1
Knocking noise at idle 2015 Mondo
Bought this boat at the end of last season. Only had a few outings last season. Didnt notice any unusual noises last year. First weekend out this weekend and noticed a knocking noise at idle. Didnt have alot of time to investigate since boat ramp was busy. Read about some people have issues with wakeplate rattling at idle? Any other ideas of what it maybe? Is there anyway to post a video which I took where you can hear the knocking, rattling, pinging noise? Engine is still under warranty but hopefully it's not a major issue.
2015 Moomba Mondo Surf Edition
WM 910 Rear sacs and 650 and 550 IBS
WS 600 WATT Amp- 4 Tower Speakers
KICKER 800 WATT Amp-Sub
Ford Raptor 400 6.2 L
Pro sport 12 Dual Batt Charger
Acme Prop 14.5 x 14.25
Winston Salem
North Carolina
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05-05-2019, 10:07 AM #2
You'll need to upload the video somewhere like YouTube, Vimeo, Facebook, etc and then link it here in order for us to see it. Have you tried holding the wake plate at idle to see if the noise stops?
2019 Moomba Max "MOOMBAE"
Mods: Wakemakers upgrade + 500 lbs of lead
2016 Yamaha AR192 - sold
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05-05-2019, 01:30 PM #3
I didnt know about the wakeplate issue when I was on the lake. I will try that 1st thing next time out. Here is a video with the knocking sound. I know it's not the best way to diagnose, but maybe someone is familiar with the issue.
Thanks in advance
Watch "2015 Moomba Mondo knocking noise while at idle" on YouTube
https://youtu.be/HhdtD_RotpM2015 Moomba Mondo Surf Edition
WM 910 Rear sacs and 650 and 550 IBS
WS 600 WATT Amp- 4 Tower Speakers
KICKER 800 WATT Amp-Sub
Ford Raptor 400 6.2 L
Pro sport 12 Dual Batt Charger
Acme Prop 14.5 x 14.25
Winston Salem
North Carolina
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05-05-2019, 02:12 PM #4
Are you talking about that random "click/tap" sound every few seconds or so? I counted 8 times I heard it and all seemed to be intermittent and not in a set rhythm. Was that video on the trailer or in the water?
Last edited by haknslash; 05-05-2019 at 02:15 PM.
2019 Moomba Max "MOOMBAE"
Mods: Wakemakers upgrade + 500 lbs of lead
2016 Yamaha AR192 - sold
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05-05-2019, 03:11 PM #5
Yes..I counted 8 clicks / taps as well. Definitely intermittent. That video was with the boat in the water at idle.
2015 Moomba Mondo Surf Edition
WM 910 Rear sacs and 650 and 550 IBS
WS 600 WATT Amp- 4 Tower Speakers
KICKER 800 WATT Amp-Sub
Ford Raptor 400 6.2 L
Pro sport 12 Dual Batt Charger
Acme Prop 14.5 x 14.25
Winston Salem
North Carolina
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05-05-2019, 03:22 PM #6
My 16 does that never seem to bother me it’s nothing major if it’s intermittent I’ve got over 200 hours on it
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05-06-2019, 05:52 PM #7Junior Member
- Join Date
- Nov 2018
- Posts
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Here is photo from dealer.
Sent from my SM-G930P using Tapatalk
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05-06-2019, 07:09 PM #8
Interesting, a knock like that would probably be heard by the engine knock sensors and kill power too.
There has to be a better fix.
Sent from my iPhone using Tapatalk2021 Supra SA 400
2018 Supra SA 400 (SOLD)
Michigan
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05-06-2019, 09:03 PM #9
No..no...“Knock sensors” detect detonation which is a specific frequency. It will detect this frequency for a period of time and then reduce timing until it stops. As a FYI a internal combustion engine is most efficient and produces the most power right on the edge of knocking/detonation.
I wouldn’t call this a knock, I would call it a “tap”....metal tapping together...it’s something in the engine bay, NOT in the engine.
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05-06-2019, 09:38 PM #10
Knocking noise at idle 2015 Mondo
2021 Supra SA 400
2018 Supra SA 400 (SOLD)
Michigan