Fogging a EFI
 

Whats the best way to fog a 500hp efi ?

I was told by someone not to fog efi's that it will clog the injectors. Any truth to this?

The service manual says to use a remote outboard type tank, mix stabilizer and 2 cycle oil and idle for 5 minutes. I 've been told fogging may damage map sensor. I like to spray with storage seal in addition to gas mix. Never had a problem.
Jim

I've heard of using both marvel Mystery Oil and 2 cycle oil. What I've read about people doing is mixing a cocktail with the Marvel or 2 cycle in the water sep filter with fuel. Run the engine till it smokes, shut down and then change the water sep filters.
Personally, I never fogged an engine for a normal winter layup and never had any issues.

The concern is probably due to the new fuels that go to hell after 30 - 60 days and actually crystalize in the injectors.

Mystery Oil, Seafoam or 2 Cycle oil are good enough to prevent this from happening and clogging the injectors. Stabile can only do so much for the fuel so storing with as low of a fuel level as possible is best.

drain most of the fuel out from the fuel water seperator filer . refill with marvel mystery oil and reinstall. start engine and run until smokeappears. your done.

fogging or introducing oil into the dry plenum on efi engines, will usually ruin the mat sensor, or manifold air temp sensor. the oil ends up shorting the sensor internal as it is a wire element sensor.
also may ruin map, but usually that would take time if it happens and will not usually show up in spring.
you can also hydra lock the engine during its dormancy due to oil sttling and seaping thru dry intake into cylyders.

In addition to above procedures (whichever you prefer) how about removing spark plugs and putting a shot of oil in each hole then rolling it over a few seconds?

If you have the time! :ernaehrung004:

I have fogged two efi500s from the very first winter.This will be my 6th winter.Never had a sensor go bad..Am I just lucky or should I change the way I put my twins to bed for the winter???

Up state31sonic, I've been doing it a long time too. It's kind of like don't hot shot your boat it might hurt your ignition. Everyone one seems to have there own beliefs and preferences.
Jim