How necessary is cylinder fogging?

[BeaverLake02]

Wondering how necessary this step is in the winterization process. Thanks for your advice.


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[NautiqueJeff]

Personally, I never do it.

It depends on how long you're planning to leave the engine winterized. Also, be aware that some engine sensors do not like fogging oil very much.

[BeaverLake02]

Thanks for the response Jeff.


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[NautiqueJeff]

Here's an article I put together several years ago about winterization:

http://www.planetnautique.com/vb5/ar...res-gm-engines

Specifically, here's my statement about fogging:
There are conflicting ideologies on using fogging oil in PCM engines. Some people prefer not to use fogging oil because they feel that it causes failure of certain sensors. Others feel that fogging oil should be used. There are also a number of different methods used to apply fogging oil to fuel-injected engines. PlanetNautique suggests that you contact your local dealer for their recommendation on the use of fogging oil and the method most appropriate to apply it to your engine.

[BeaverLake02]

So I have the GT40 motor. Wonder if it still matters. I'll call the Tulsa Nautique dealership. Thanks for the help.


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[vision]

Personally, I never do it.

It depends on how long you're planning to leave the engine winterized. Also, be aware that some engine sensors do not like fogging oil very much.

Second.

[Quinner]

If it's carbed, dump it down the carb while running, if EFI you should spray in spark plug holes and rotate motor by hand after fogging all cylinders, this method will not have an effect on the sensors. When done correctly I guarantee it will not shorten the engines life so why not spend the 10 minutes once a year.

[Tjca77]

CC manual for a 2000 air, pro air, or sport says to fog each cylinder prior to storage. How would it shorten engine life?

[scottb7]

I asked pcm a year or two ago. This is their response:
Scott,

the only way to kill both spark and fuel effectively is to put the engine in a compression test mode. This has to be done with Diacom which is something that our dealers carry. Otherwise unless you are storing the boat for an extended time (like over a year) then you don't really need to fog the engine.

Customer Service
Pleasurecraft Engine Group

[BeaverLake02]

Thanks all! No fogging for me as the boat will get a brief 5 mo break per year.


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[Quinner]

How would it shorten engine life?

Exactly, quite the opposite, not fogging the cylinders on the other hand??


Scott,

Sounds like PCM is commenting on fogging via the throttle body, which should not be done on EFI motors, proper method is via the spark plug holes.

[scottb7]

Quinner, that is right. At the time I was trying to figure out some way of fogging without having to remove each plug. So glad he told me I did not have to unless storing over a year. Human nature: thinking someone is right that happens to agree with you...