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Aaron Kempfer

2005 Volvo Penta 8.1 GXi 1400 rpm max

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Hello Everyone.

I hope someone has had this happen and can point me in the right direction.

2005 Chaparral 256 SSi

Engine 8.1 GXI-E 3869285   4012149875         Drive Unit  DP-SM 1.78 (M22)  2868912  4202133431    Transom Assembly TSK SX-MHP 3868850  4151085733

This weekend we were cruising along at 3000 RPM when I go t a constant beep and it cut power. Beep turned into long intermittent beep when I put the throttle in neutral then went away completely after about 20 seconds. All gauges reading normal, shut off engine, raised engine hatch, not hot, nothing out of the ordinary. Checked all fluids, they were all normal. Started the engine up, once I get past 1400 RPM it starts an intermittent beep. It will cruise "all day" as long as it stays under 1400 RPM. I can put the throttle at WOT and it will run up to 3000 for about 3 seconds then constant beep, cuts power, down to about 2200 RPM, intermittent beep until I power down to 1400 RPM. If I leave it in WOT, it will go from 3000 RPM down to 2200 RPM and back to 3000 RPM, over and over until I change throttle position. The whole time it is a constant beep. I only did that once just to see if it would help diagnose the problem.

I am not sure if the marina has the proper scan tool to tell me exactly what it is or if their scan tool just says it is a faulty sensor, faulty ???. I hate to pay them to scan it if it won't give me a definitive answer and now I just become a parts changer until I find the right sensor, etc.

Thank You all in advance!!

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First of all, a constant horn is a critical alarm so stop running the thing. Your helm indications reading normal is a good thing, but understand that your ECM that is activating the alarm and initiating protection mode limiting RPM use a different set of senders as your 8.1 is equipped with 2 oil pressure and 2 engine coolant temperature senders. You may have low sea water pressure, or high exhaust manifold temperature that would not show up on your helm display. There is also a possibility that your helm display sensor is giving you a false indication, and in reality you actually do have low oil pressure, or high engine coolant temperature that the ECM sees.  IMHO you might want to pay the money and have it scanned, or better yet, buy the tool and do it yourself. Typically the first time you need a repair, the tool pays for itself. W

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2 hours ago, Wingnut said:

 

Thanks Wingnut! Can You help me find where / what to buy?

I felt the manifolds and neither of them were too hot to touch. The solid beep only happened for 2 to 3 seconds. The rest of the time I was trying to figure it out, it would only intermittent beep over 1400 RPM.

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3 hours ago, Aaron Kempfer said:

Thanks Wingnut! Can You help me find where / what to buy?

I felt the manifolds and neither of them were too hot to touch. The solid beep only happened for 2 to 3 seconds. The rest of the time I was trying to figure it out, it would only intermittent beep over 1400 RPM.

https://www.rinda.com/techmatepro/

Be sure to also buy the patch cable for your particular ECM.  W

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4 hours ago, Aaron Kempfer said:

Thanks Wingnut! Can You help me find where / what to buy?

I felt the manifolds and neither of them were too hot to touch. The solid beep only happened for 2 to 3 seconds. The rest of the time I was trying to figure it out, it would only intermittent beep over 1400 RPM.

I also did a try before I buy from this guy - reasonable rental fee if you are hesitant to jump in and buy right away  https://handymanstoolcrib.com/whats-in-the-crib%3F

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Not sure if fuel pressure fluctuation or anomalies would cause an audible engine alarm. But fuel pump pressure/fuel delivery may be something to look into. 

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