1996 Sunbird Corsair 220 SEL 5.8 Ford motor OMC outdrive The boat will randomly go into a safe mode and will not run

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Does it sound like it starts sputtering above 2000 RPMs?

WHat exactly does it do when it reaches that speed?

Thank you

Tech Michael

Hi, Thanks for that.

Since it overheated twice, I will bet there is some where its losing compression.

I would have this motor checked for a warped part. When you cant get power after an event like this its almost ALWAYS a warped head or also as possible they didn't do the valve job correctly. In may just need tuning.

Those are the only things that would cause this unless they left something loose like the carb(throttle body).

If they checked everything good for warpage, then it needs tuning is all ;-)

In any case, I will stick with you until this is complete.

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Tech Michael

Hi thanks for that,

Unfortunately this one doesn't have a diagnostic port you can use, but the mechanic can.

If you dont think its mechanical and it did cross my mind, (actually it was the first thing I thought of) you may have a loose wire as well that would cause this. Bad connections are always an issue with boats, and maybe you just need to unplug each wiring clip and spray it with a little bit of WD-40. That may very well fix this. I would try that first for sure if it was my boat.

Tech Michael

I will stick with you all the way .

Please rate kindly so I can do so.

Hi that one as I said doesn't have a port that you will be able to use, you need an analyzer and unfortunately the only ones who have these are the dealers and Marine shops.

A meter won't help here ;-(

I would think if all was fixed, you may just really need it re tuned, possibly new spark plugs considering what happened.

I would replace those, and also spray all the pug in connectors once you disconnect them, That may very well fix this for you ;-)

I've done so much of this type of work that this is exactly what I would do to save money. If it doesn't help then they need to recheck their work.

Hi, thanks I would really say that they missed something because this problem is usually a cracked head or something that warps now when it gets hot.

I wish I had better news for you you but I know motors so well.

They really need to re check this one.

Sincerely

Tech Michael

Hi they will return your deposit unless they do feel that I have given you the correct information.

I dont think this is a sensor issue considering all that has happened.

Also I haven't been paid anything for my help at this point.

If you will rate my answer kindly I will forward this to customer service for review on a refund.

Although I believe I am correct on this diagnosis. I have been working on these for over 30 years so Im pretty sure of that.

In any case, I will stick with you until this is complete.

Please rate my service kindly.

Also it is the only way I am credited for my time and expertise with you.

Once you rate, I will be notified and will add your question to my priority list so you can reach me anytime until this problem is solved.

Then you can reach me by simply replying to this message anytime.

Thank you

Sincerely

Tech Michael

Hello. My name is Tan.

Has the boat been sitting in storgae? Have you tried another fuel source?

The symptoms arte more like you have a fuel restriction developing after you have run the boat awhile. This is a common issue with marine engines. What happens is over time the fuel tank does gets some residue and debris build up in the tank. The pick up tube in the fuel tank has a screen on the end of the tube. The symptoms are the boat will run fine at lower rpms when the engine isn't burning allot of fuel then when you increase the rpms the fuel demand becomes greater. This demand puts more vacuum on the fuel pick up tube and all the debris in the fuel tank begins to collect on the pick up tube screen eventually clogging to the point the engine starts to loose power and rpms.

The when you back off throttle the vacuum decreases and the debris falls off and engine runs good. Till you throttle up again it might run up to rpms for a short burst then it starts loosing power again.

Does this sound like what your engine run issue could be?

Yes he will see it. Just let me know.

The wire you are looking for is a Tan with a blue stripe. Just connect a voltmeter to the tan/blue. Negative test lead to the tan/blue and red to 12 volts run the boat and watch the meter when the engine acts up the meter will show 12 volts. If it doesn't show 12 volts then this is not the problem. If it does then either the temp or oil pressure switch is bad or the engine is loosing oil pressure or over heating. It's just strange to me it only does it when you throttle up and goes away when you back off throttle. Safe mode limits the engine rpms to 2500 and your going above that. This is why I though fuel supply.

Keep me posted.

Here's a wiring diagram.

That's great Al.

Happy 4th.