High RPMS in neutral

[Stazi]

Could be an IAC valve.

True.


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[Mikes]

We chased the same problem for over a season. A new tps and its plug fixed it completely.

[mmandley]

You might still have a vacuum leak, you can spray WD 40, but I would use Carb cleaner as its not a lubricant, praying lubricants into the intake can cause gumming, fouled plugs.

Spray around the intake manifold gasket, the throttle body mount, anything bolted to the intake. While the engine is running, if you hear it bog down then that's your leaking area.

It sounds like the engine is getting hot and then your having some leaking issues.

The TPS could very well be an issue but something like that should be reading badly anytime your high throttle then goto Idle. Since that seems to be when your noticing this problem the most.

[Zoch]

You might also look at any vacuum hoses. Bad hoses will cause high idle

I have a similar problem. I own a 2017 Moomba mondo surf edition, just put it in, won’t idle below 1500 rpm, just had the wiring harness replaced this past winter. Dealer told me computer needs to be replaced, any other options before I trailer my boat 2 hours back to the dealer and ruin my Memorial Day weekend?

[Stazi]

I have a similar problem. I own a 2017 Moomba mondo surf edition, just put it in, won’t idle below 1500 rpm, just had the wiring harness replaced this past winter. Dealer told me computer needs to be replaced, any other options before I trailer my boat 2 hours back to the dealer and ruin my Memorial Day weekend?

Oh that sucks. Bad harness on a new boat? What is the reason for the replacement and why would the ECM need to be replaced as well? How did all that come about?


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[Zoch]

Never had a problem with it last summer, when I took it in to winterize it, dealer said they couldn't start it and they replaced the wiring harness. Dealer is telling me over the phone that it is the computer, I tried disconnecting all power and resetting, hasn't worked. Any ideas on how to fix before I trailer it back?

[Stazi]

Never had a problem with it last summer, when I took it in to winterize it, dealer said they couldn't start it and they replaced the wiring harness. Dealer is telling me over the phone that it is the computer, I tried disconnecting all power and resetting, hasn't worked. Any ideas on how to fix before I trailer it back?

Sorry. Wish I could help, but sounds like something beyond a simple fix.


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[Edo88]

You can usually do a capacitive discharge on computers and do a reset. Disconnect the batteries and touch the ground and positive cable together this will clear the capacitors in a module make 100% sure though batteries are disconnected other wise you’ll make some sparks and potentially mess up some other stuff


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[Zoch]

Just following up on this issue, there was a vacuum hose disconnected, rpms dropped once we reconnected it and it ran fine for a while. Now I am getting the following diagnostic message: DTC 1157: Closed-loop gasoline bank2 high
SPN: 4238 FMI: 0 ADDRESS: 0 PLUG ID: B

Any help on this? Thanks in advance!

[Stazi]

Just following up on this issue, there was a vacuum hose disconnected, rpms dropped once we reconnected it and it ran fine for a while. Now I am getting the following diagnostic message: DTC 1157: Closed-loop gasoline bank2 high
SPN: 4238 FMI: 0 ADDRESS: 0 PLUG ID: B

Any help on this? Thanks in advance!

Unhook the battery and let the ECU reset. It is probably all confused now after compensating for the vacuum leak which you then corrected.


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