Answer straight from PCM regarding fogging of engines...

[IDBoating]

Thought I'd give this its own thread. There are quite a few others where the topic of fogging has arisen but I want to make sure everyone interested sees this data.

I just got off the phone with real live people at PCM. I was asking them about their recommendations regarding fogging engines - yes or no on injected engines, yes or no on Catanium equipped engines, etc. Deborah at PCM was being very helpful and relaying the questions and answers between me and her technical folks.

Interestingly, I actually got conflicting answers depending on to whom Deborah spoke each time she put me on hold. At one point the answer was an adamant "NO". At that point, I asked how we should protect the cylinders for ~5 months if we're not supposed to fog them. Finally, I think she got tired of being the relay runner and a tech guy picked up the phone.

To the question "Should we fog our EX-343 engines?", his response was "Yes, remove the spark plugs and put in one tablespoon per cylinder." I said this was in agreement with the manual, and asked if I should then rotate the engine by hand to distribute the oil around as also described in the manual. Answer: "Yes." I asked if the reason for going through the plug holes was to avoid running fogging oil through the injectors. Answer: "Yes."

I then said that some have suggested CAT engines should not be fogged. To the question "Should we fog CAT engines too?", his response was "Yes." I then said "I understand we are to administer the fogging oil through the spark plug holes to avoid running it through the injectors. Are you saying the CAT exhaust system is not affected by fogging oil?" Answer: "Yes."

So there we have it: Authoritative answers to the questions of fogging, fuel injection, and Catanium exhaust systems.

Hope this helps!

[22veguy]

The Authoritative answer is kind of sketchy if the Authority believes the fogging oil goes THROUGH the injectors.

[chpthril]

The Authoritative answer is kind of sketchy if the Authority believes the fogging oil goes THROUGH the injectors.

LOL I was just about to quote that part and question it!

I am still without an answer to the old wise tail as to why fogging a port EFI engine will damage the injectors. What's his name did post some very logical info that fogging can coat the IAT sensor and possibly clog the opening of the MAP sensor, depending on where they are located. So, I would agree that fogging through the throttle body of a port EFI engine could result in a damaged sensor. But it still leaves the "You will damage the injectors" unanswered.

Thanks for the info, it's a start.

[dom w. forte]

LOL I was just about to quote that part and question it!

I am still without an answer to the old wise tail as to why fogging a port EFI engine will damage the injectors. What's his name did post some very logical info that fogging can coat the IAT sensor and possibly clog the opening of the MAP sensor, depending on where they are located. So, I would agree that fogging through the throttle body of a port EFI engine could result in a damaged sensor. But it still leaves the "You will damage the injectors" unanswered.

Thanks for the info, it's a start.

The injectors are in the intake runners and can get caked up with the oil on the tips, so yes you could cause a problem.

[IDBoating]

The Authoritative answer is kind of sketchy if the Authority believes the fogging oil goes THROUGH the injectors.

I didn't dig any deeper when that came up, but if you stretch a bit I took it to mean that you shouldn't protect the cylinders via the fuel system.

Example: Running a premix of gasoline plus two stroke oil, which I've seen recommended a few places. That's EXACTLY how I winterize my two stroke V6 Mercury EFI engine, but that engine and its injectors are specifically designed to handle an oil+gas mixture (and that's how Mercury says to winterize). The injectors on PCM's four-stroke engines weren't designed to pass burnable oil. Again, I'm reaching a lot here but that's what I took away from the conversation.

[chpthril]

The injectors are in the intake runners and can get caked up with the oil on the tips, so yes you could cause a problem.

Well aware of the location of the injectors, but with 18Hg of vacuum in the intake and 35PSI of fuel pressure exiting the injector, I dont see it happening. As well as the actual injector pintle is somewhat recessed away from the actual tip of the injector body. Not saying you're wrong, just dont see it happening.

[dom w. forte]

Well aware of the location of the injectors, but with 18Hg of vacuum in the intake and 35PSI of fuel pressure exiting the injector, I dont see it happening. As well as the actual injector pintle is somewhat recessed away from the actual tip of the injector body. Not saying you're wrong, just dont see it happening.

Ive had them get caked up just from a bad pcv valve.

[chpthril]

Ive had them get caked up just from a bad pcv valve.

I hear that!

[skindog44]

how to fog a 08 22ve MP engine

So I've done all the winterizing steps, except for fogging the engine. With a fuel injected engine, is there a need to fog, and if so, what is the best way to do it? I've already ran stabile thru the gas and engine, letting it run for 5 or so minutes. Thanks!

[IDBoating]

So I've done all the winterizing steps, except for fogging the engine. With a fuel injected engine, is there a need to fog, and if so, what is the best way to do it?

As noted, I have received conflicting instructions from PCM on the question of fogging. The last verbal instructions I received said Yes, you should fog. The last email instructions I received said No, you don't NEED to fog but if you do you should use special "catalytic converter compatible" fogging solution. In both cases the instructions agreed to squirt the fogging solution into the spark plug holes and then rotate the crankshaft by hand a turn or two to distribute the fogging solution within the cylinders.

By the time I received the "catalytic converter compatible" answer I had already followed the first set of instructions and fogged using standard solution. Since it appears they consider fogging optional anyway, I'm comfortable that my engine is protected. Whether "standard" fogging solution will have an impact on my CAT exhaust system... I guess we'll see.

Hope this helps!

[91Terminator]

As noted, I have received conflicting instructions from PCM on the question of fogging. The last verbal instructions I received said Yes, you should fog. The last email instructions I received said No, you don't NEED to fog but if you do you should use special "catalytic converter compatible" fogging solution. In both cases the instructions agreed to squirt the fogging solution into the spark plug holes and then rotate the crankshaft by hand a turn or two to distribute the fogging solution within the cylinders.

By the time I received the "catalytic converter compatible" answer I had already followed the first set of instructions and fogged using standard solution. Since it appears they consider fogging optional anyway, I'm comfortable that my engine is protected. Whether "standard" fogging solution will have an impact on my CAT exhaust system... I guess we'll see.

Hope this helps!

I think the best move would be to move to a state where you can year round boat and not have to winterize

[IDBoating]

I think the best move would be to move to a state where you can year round boat and not have to winterize

That would definitely have its benefits!

[91Terminator]

That would definitely have its benefits!

Ya once you get used to sweating as soon as you walk out side its perfect.

[IDBoating]

Ya once you get used to sweating as soon as you walk out side its perfect.

The proper solution to that problem is to never leave the lake water! {grin}

[JUST-IN-TIME]

Mercuay marine has a new fogging methiod for all carb, EFI, MPI motors

they mix
2stroke oil
stabilizer

i can post up the factory info if needed

its like a 1000/1 mix
so no sensors are harmed the and the injectors get a little lube so they do not stick if moisture was formed after fogging

yes you can add oil in each cylinder,i would use 2 stroke thou