In the past, I have winterized my cl 180...change oil, fog engine, add anti freeze, and add stablizer to gas. Now that I have my 220 LS with the 5.4 EFI engine, how much different will it be? Do you still fog this type of engine? Trying to save money where ever I can.

Fogging is a little different. Do not spray the fogging oil down the intake as it can create problems later with the MAP sensor. Instead, mix and fill up the fuel/water separator filter with a gas, fuel stabilizer, and TC3 oil mixture. Start the engine and run it long enough to pull the mixture into the engine.

Merc service bulletin 2001-15 lists the ingredients and quanity of what they recommend for fogging the engine with. Personally, I mix up a smaller quanity and dump what is left over into the boats gas tank and/or the lawn mowers. 

New Gasoline EFI/MPI Engine Fogging Procedure

Models

All MerCruiser gasoline EFI and MPI engines produced in Stillwater.

NOTE: This change does not apply to carbureted engines produced in Stillwater or Hi-Performance

engines produced by Mercury Racing.

Change

Follow this new fogging procedure when laying an engine up for storage.

Fogging Mixture

In a 6 US gal (23 L) remote outboard fuel tank, mix:

5 US gal (19 L) regular unleaded 87 octane (90 RON) gasoline.

64 fl oz. (1.89 L) Mercury or Quicksilver Premium Plus 2-Cycle TC-W3 Outboard oil.

5 fl oz. (150 mL) Mercury or Quicksilver Fuel System Treatment and Stabilizer, OR

1 fl oz. (30 mL) Mercury or Quicksilver Fuel System Treatment and Stabilizer

Concentrate.

 

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Phil Belcher
2003 266CCR
496 MAG, Bravo 3

Hey, Phil. I have the 2001 Mercury 5.0 "EFI". When I think of EFI I think of the individual injectors for each cyclinder and, therefore, no carburetor. I have what I believe to be what I use to call a throttle body injector that feeds gas into what looks like a carburetor. There are no fuel injectors on the individual cylinders. Do I have a MAP sensor?

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2001 202BR 5.0 EFI B3
"Calico Jack"

John,

To the best of my knowledge, I do believe that a MAP sensor is installed on EFI and MPI engines. Around the years 2000-2001 is when MPI became more common so engine serial number will be useful to determine which engine that you have. I sent you a useful link by e-mail. Manual 24 and 31 should be of interest to you.

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Phil Belcher
2003 266CCR
496 MAG, Bravo 3

Cool. Thank you. For the last couple years I've been fogging the heck out of the carburetor thinking that it's not the true EFI, at least as I know it.

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2001 202BR 5.0 EFI B3
"Calico Jack"

John, you can fog a throttle body motor just like a carb if you want....spray the oil into the intake until she dies. The MPI motors, just as Phil stated, are only to be "fogged" per the bulletin.

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"Toy Story"

Y2K 266BR
454 Mag B-3

My crownline dealer provides three levels of winterizing.

The second option includes antifreeze but, no fogging and the third option includes fogging but no antifreeze. Is fogging required?

It's a good idea Hector.  It will help prevent rust from forming on the cylinder walls and rings. 

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O'
"Little Mascara 3"
2003 266BR,496 MAG w/Bravo III