Engine was at normal operation temperature. I used the hose that attaches very close to the throttle body. There are two hoses there, towards the back of the engine. I used the lower one, the one that is more towards the right hand side of the car. I reved the engine around 1500 rpm's and dropped the hose into the water. Within a couple of seconds had to open the throttle more to keep the engine from stalling. It sputterd alot and smoked a whole lot. Had to keep the revs around 5000 through the process. It drank about 1 Gallon of water in about 5 mintues. Afterwards I changed the spark plugs, they were old and needed to be changed anyway. I turned on the car and imediatly noticed that my idle problem was GONE. No more eratic idle and the engine sounded so smooth. It doesn't shake anymore and it sounds more mellow. I don't attribute it to the new plugs either because I have changed my plugs before and it never made this much difference. I guess my engine just really needed it. It has about 85,000 miles on it. I was very easy to do and worth it. The car seems to pull harder, although I wasn't really able try it out well with all this rain.



This is the only picture I have, it should give you an idea of where the hose I used is located. I am not sure if that hose feeds both rotors. Does anyone know? or if there is a better hose to use? Anyway, it worked well I am happy

 

hmmm this is something i will do for sure then.....

theres no ill effects to doing this on a turbo is there?

it doesnt seem like there would be, but i figured i would ask

 

anyone know if this will work OK on T2s?

 

It will be fine, people have been doing this for many years... Its not a rotary specific thing.

 

So what exactly does doing this do? Sorry, kind of a n00b question I know

 

Never heard of this done before. I guess it would work.

Using water as a solvent I'm guessing?
Is the purpose to clean the intake runners or the engine it self?

 

I read about it here on the forums.. it's supposed to loosen up and clean out some of the carbon deposits on the faces of the rotors and housings. There are no adverse effects to doing it as far as I know.


also, I had a jackass mechanic flood my car, while I wasn't there and he messed around with the idle screw on top of the intake. Now that my car has a solid idle.. it's on the low side.. around 400-425rpms very stable though. Isn't the normal idle supposed to be around 700-750rpms? Moving the screw clockwise will decrease or increase idle? (assuming a birdside view of the screw of course)
TIA

 

The water gets turned to steam during the combustion process, and it's the steam that does the cleaning. So no, it won't clean anything other than the chambers.

Note that some vac lines are only fed by one intake runner, so only one chamber will actually get cleaned. The ones on the front of the UIM directly behind the TB should be used (but not the middle one, it's fed from before the throttle).

 

Rock on cp... I was hoping you'd post a followup on this. Good to hear it worked well for you.

 

can someone answer my question please?
"also, I had a jackass mechanic flood my car, while I wasn't there and he messed around with the idle screw on top of the intake. Now that my car has a solid idle.. it's on the low side.. around 400-425rpms very stable though. Isn't the normal idle supposed to be around 700-750rpms? Moving the screw clockwise will decrease or increase idle? (assuming a birdside view of the screw of course)"
TIA

 

10-4 TIA....that's right.....clockwise=increase and you want 700-800.

I gotta try that water trick. Never heard of it. Where do the deposits that get flushed go?

 

Out the exhaust like the rest of the steam

 

So let me get this straight...

You unhook a vacuum line that's on the TB and stick it in a bucket of water with the car running, keep the car running... for how long?

 

till it drinks up about a gallon or so.. takes about 5 mins

 

Just as NZConvertible said earlier you need to make sure the vac line your going to feed water into goes to both chambers.

Personally I used the BAC vavle nipple thing on my S4 N/A, because I dont have the BAC connected anymore. You would probably have to find a different one. Someone will be able to help in that regard im sure.

You can keep it running for as long as you want really, I usually just do about 1-2 litrers of water or so every now and then. It's werid every time I do I could hear it idle better.... So I personally think it really does help somewhat.

 

how about the hose I used.. you think that feeds both rotors?

 

Yes this is a very common thing. Although several other people generally use ATF(Automatic Transmission Fluid) To do the same thing. The goal is to get the gases in the chamber Extremely hot and burn off the carbon deposits. The only ill side effect might be a glowing manifold. W/ atf there is a bit of a different procedure though.

 

I thought water in the engine was a big no no? If not, then why do cars stall when water is sucked in through the air intake? wouldn't this process take place much the same?

 

I was aware of that.. someone had posted before that his exhaust manifold and cat were glowing red.. I checked mine every few minutes.. it was all normal

 

It's how fast the engine swallows it that matters. Slowly through a skinny line is okay, a whole lot at once (e.g. submerged intake) is very bad...

 

has anyone ever hydrolocked a rotary? I've never heard of it happening, but water can't be compressed regardless of engine types so I'm sure it's possible.

 

K, last questions (I think): Is this OK to do on a turbo model (88TII)?

And which hose should I use to feed both chambers if I decide to do this (my car has a lot of miles, so it could probably use a good cleaning!)

 

Can some one show a PICTURE the best vac hose to use for this? I been wanting to do this to my S5 N/A.

And from what I read in my search.. it is safe to do this on a turbo model, many people used the vac hose off the wastegate IIRC.

 

I wonder, remember that useless cold-start-assist injection system? Maybe hyjacking that thing's injector . . . .

 

Search, I was reading about that ealier when I was searching. To bad my S5 doesn't have cold start.