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Chisolmdb84

Check engine only at high speed

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Chisolmdb84

Took the boat out and ran great but if I go above 35 the check engine warning comes on. Oil pressure is good and temp is good. If I stay below 35 it's fine

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racer808

What RPM are you at doing 35?  

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Chisolmdb84
20 minutes ago, racer808 said:

What RPM are you at doing 35?  

My gauge is dead and I'm waiting on a new one so I'm not sure. Sorry 

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electricjohn

Is your knock sensor connected?

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Chisolmdb84
On May 14, 2016 at 7:21 PM, electricjohn said:

Is your knock sensor connected?

Idk how do I check that. This is the first inboard I've ever owned

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wdr

If so equipped it or they will be the round mushroom shaped plugs with wires located center mass of the block and just above the oil pan. There may be another location for it, that is the most common spot.

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Chisolmdb84
11 hours ago, wdr said:

If so equipped it or they will be the round mushroom shaped plugs with wires located center mass of the block and just above the oil pan. There may be another location for it, that is the most common spot.

If they are installed is it possible for them to go bad. And if so how can I tell?

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electricjohn

They (if you have 2) have to be removed to drain engine for winterization.  Sometimes the mechanic forgets to reconnect the electrical connection to them.  When this happens, you will get an alarm at 30 to 35 mph.  They normally don't go bad being there are no moving parts in them, but if they do, you get an alarm, usually at 30 to 35 mph.  They are connected to the engine computer. 

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Chisolmdb84
3 hours ago, electricjohn said:

They (if you have 2) have to be removed to drain engine for winterization.  Sometimes the mechanic forgets to reconnect the electrical connection to them.  When this happens, you will get an alarm at 30 to 35 mph.  They normally don't go bad being there are no moving parts in them, but if they do, you get an alarm, usually at 30 to 35 mph.  They are connected to the engine computer. 

Ok I'm going to check this when I get home today. Thx a lot for the help. I'll post and let you know how it goes

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Chisolmdb84

Knock sensor was unplugged. Taking the boat out later to see if that fixed it. Thx for the help guys

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electricjohn

There may be two. check the other side of engine.

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Chisolmdb84
38 minutes ago, electricjohn said:

There may be two. check the other side of engine.

Yes there were two! Thx again 

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electricjohn
4 hours ago, Chisolmdb84 said:

Yes there were two! Thx again 

your welcome! good luck.

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