engine cleaning/vacuum hose

[Toyota343]

On my 94 Camry V6, I bought a can of " Motomaster- Tune up in a can" that I'm trying to spray inside a vacuum hose to clean the inside of the engine. It says on the can to disconnect the vacuum line from the engine, and spray it into the hose with the car running, and to prevent it from stalling (adding some throttle/gas) while spraying. Then it say to run the engine so the product can come out fully from the exhaust after cycling through the engine. The problem is, is that although I have a vacuum diagram under the hood, I still do not know which vacuum to spray it into. So far, I disconnected a line that goes from the air intake boot to the right/front side of the engine (beside the front the spark plugs [to the right of them]), and I sprayed some into this inlet, but I'm not even sure what that inlet is for- it kind of sucks air and pushes it out. I read on another site that someone wanted to clean their engine using an engine cleaning product and someone told them to disconnect the vacuum going to the pcv valve, and to spray it into that hose-I'm just not sure because there are many vacuum hoses. I would greatly appreciate it if someone can please describe to me which vacuum hose I should spray this product into, so that it can cycle through the engine and come out of the exhaust.

Also, should I really use this product on the engine (it says it is safe for O2 sensor and catalytic converter)- but is it safe for the engine and is it effective in cleaning. I found that this engine had lots of carbon build up from the previous owner, that's why I'm cleaning it. But now I'm only using the highest octane of fuel, I replaced the PCV valve, I poured in some injector cleaner, cleaned throttle body outside and inside, changed air filter, oil and oil filter, and sparkplugs, and drive the car hard sometimes and rev it for a while to clean out the engine. Is this enough to clean and should I really use this "tuneup spray"? Has anyone ever used anything like this?

[Chris Crash]

Find a vacuum line that when you pinch it shut, it makes the car try to stall. Use that line. What I would do is pour that into a cup and dip the line into the cup, then when it's about to stall let the line get some air again and repeat.

[Toyota343]

okay thanks. Also, can you tell me what that inlet at the right/front side of the engine that connects to the air intake is for? (take a look at this image I found on google ( http://www.mindspring.com/~acuralege...ve-picture.jpg ) refering to the thinner hose that connects to the left of the huge air intake hose.)

[Chris Crash]

It's for PCV. It's important, but don't use that to suck up cleaner.

[Toyota343]

I've been searching around other posts and many others are using products such as deep creep or seafoam by letting the product be sucked into the hose that connects to the PCV valve. Can I also put my product through the line that connects to the PCV valve since it acts like a vacuum (which says on the bottle to spray it into a vacuum hose)?

[Chris Crash]

Any vacuum line that sucks air will work. Like I said just pinch one of the smaller tubes, if the engine starts to sputter than use that one.

[V6266]

That is interesting, you have to let me know how it works, I haven't ever used one that sprays directly into the vacuum...That is interesting.

[rngan]

I tried using the motomaster tune up in a can on my toyota 99 corolla, via the vacuum hose from the brake booster, and it seems to have cleaned all the carbon out, now my car runs like new with easy to accelerate now, i found the hose by looking first for brake fluid container, behind it is this big round disc shape on the wall of car, and a rubber hose into it, when you unplug it, it suck air in while engine idles. Something similar to this youtube video

You Tube

You Tube

but this was using seafoam, i used same technique with motomaster tune up in a can.

[LynchburgCSI]

Olddddd threadddd.

[Chris Crash]

At least he searched! And he posted results, even better!

[rngan]

Yes, at least I posted results , I also did my 2nd car, a nissan quest 95 van, and same thing happened, tons of smoke came from tail pipe during and after it was performed with motomaster tune up in a can, and also resulted in smoother accerator feel. However on my sister's corolla 94, which has very little mileage(90K KM), i didnt even see a single spec of smoke from tail pipe, I can only assume its cleaner engine due to very low mileage. So I stopped it half can thru doing it to avoid wasting it.

[73sport]

One thing I would caution against is the random vacuum hose use as some are routed through solenoid valves and into canisters. Canisters typically don't have pickup tubes at the bottom!

There a 2 main vacuum sources on any engine, ported vacuum which is present when the throttle is open and the engine revving (think right next to or ahead of the throttle plate) and manifold vacuum which is present at idle and drops off as engine rpm increase, load increases (think after the throttle plate). So look for hoses coming from those places depending on which one you want to use to pull fluid in.

This pix for example, the two lines right on top are headed rearwards towards the EGR modulator are ported vacuum and actuate the EGR only when the throttle is open.



Is that an early 94 as the throttle body area doesn't look like the typical 1MZ which have the IAC right up front next to the air inlet hose from the filter.