The other nite I installed the heat gaskets for the 3rd Gen and when I removed the pipe between the airbox and the TB I noticed alot of gunk and crap on the TB itself, which was coming from a small hose running from the rear crankcase back into the pipe just before the TB.

I cleaned up the TB, removed and cleaned the pipe, also removed hose from crankcase and installed a small inline filter onto the hose after cleaning it.

Which brings me to the main question.........

With the TB removed I managed to get a peek inside the manifold itself and it is covered with a sticky sooty coating and this coating covers the whole of the intake, I even put my fingers up inside the runners when I had it lifted up and found even more soot in there.

Is it OK to clean it? Whats the best method? Degreaser/BottleBrush and the Hose be OK? Precautions?

that small hose that connects with the intake just before the TB is th oil breather hose isn't it wot would happen if u just disconected it or blocked it off. i thing it just for emmisions controll or something??

that small hose that connects with the intake just before the TB is th oil breather hose isn't it wot would happen if u just disconected it or blocked it off. i thing it just for emmisions controll or something??

Legally you can't have any unfiltered gas escaping the engine (why atmospherically venting BOVs and catch cans with breathers are illegal). Thats why the breather hoses are re-routed into the intake.

Legal issues aside, you could disconnect the breather hoses from the intake and plug up the resultant hole, but do not block the hose off it is there to vent excess pressure thats built up in the heads via the PCV valve (90 degree angle bit connecting the hose to the rocker cover).

Legally you can't have any unfiltered gas escaping the engine (why atmospherically venting BOVs and catch cans with breathers are illegal). Thats why the breather hoses are re-routed into the intake.

Legal issues aside, you could disconnect the breather hoses from the intake and plug up the resultant hole, but do not block the hose off it is there to vent excess pressure thats built up in the heads via the PCV valve (90 degree angle bit connecting the hose to the rocker cover).

Can I just take the hose off leaving the valve to expel its pressure into the engine bay?

Also, are the valves removeable to clean etc in kerosene? I removed a valve once from the top of a 2nd Gen V6 and cleaned a whole lot of **** out of it cos it was stuck.

Can I just take the hose off leaving the valve to expel its pressure into the engine bay?

Also, are the valves removeable to clean etc in kerosene? I removed a valve once from the top of a 2nd Gen V6 and cleaned a whole lot of **** out of it cos it was stuck.

Yeah you can just connect a longer hose to the PCV and let it hang lower in the engine so it doesn't spray oil vapour though your engine bay. (edit: just make sure you don't forget to block the hole where the hose was plugged into the intake tube. Unfiltered and unmetered air doesn't agree with the motor :P)
I have cleaned my PCV valves using carby cleaner in the past.

Nulon throttle body cleaner gets all the gunk off. Did mine last weekend came up like new. Split the manifold remove it and give the top section and bottom section a clean. Car may splutter for a bit till all the creap clears out from the cylinders but will run fine afterwards.

Regards

I am assuming the car will run better once the manifold has been cleaned?

Definately dont block the hose coming from the PCV or you will end up having oil leaking from seals etc if there is enough crankcase pressure. It is an emissions issue.
I you do it sneakily, you can extend the hose running from the PCV and run a filter on the end of it and as mentioned close off the entry into the throttle body.
The manifold can be cleaned with degreaser, kero, etc but carby cleaner is the quickest.
This is also a good time to check port matching between the manifold sections and give the runners and plenum a cleanup with a die grinder.
Just ensure that its clean and that you havent picked up any gunk or sand in the plenum or runners before you put it back on the engine.

Use carby Cleaner and a bottle brush, when i did mine it came up alot better, and your gonna need a whole can.....and dont do it on painted concrete....cause it likes to eat paint:)

Ummm yeah take it off and go nuts, dont worry to much about the hose, just make sure you clean the PCV valve with some carby cleaner too

i used export degreaser a few weeks ago ($2), works like a charm, only cleaned the tube and the trottle body, didn't get around to the manifold coz i could get the bolts off, it was still hot, from my previous drive. but it certainly made a difference after i had them cleaned.

I am assuming the car will run better once the manifold has been cleaned?
No, it wont make a difference at all.

It might make a difference if the solvent cracks seals on your injectors or degrades vacuum lines though.

Its just a micron thick layer of carbon build up, leave it be unless its making the throttle sticky.

i agree wat said previous carby cleaner is the go for cleaning and to avoid that build up i think u need an oil catch can to reduce this:think:

I'd be operating under the "If it aint broke then don't fix it" rule.

Too many strange solvents and dislodged gunk in there and you don't know what trouble you will stir up.

If I had it out of the car and stripped for other work then yes I would clean it up.

Rob

I had my Manifold off today/yesterday and its absolutely filthy... Looks something like my TB: http://img36.imageshack.us/img36/6699/31052009007y.jpg Theres about 1-2mm thick carbon buildup there. I replaced the TB today with a reasonably clean TJ cruise one (I will be pulling it off and cleaning it when I've got some cleaner).

Question is, are there any benefits to cleaning the manifold? I imagine with all that gunk in there it has to be disrupting something? It's prob about 2mm thinner in each runner all-round. That would be disrupting airflow quite badly right?

carbie cleaner and a tray to catch the cleaner so you can reuse it whilst scrubbing off the stubborn stuff

once its cleaned, give the tb and intake a maintenance squirt every second service with carbie cleaner
it is rarely done by the professionals when they perform a service and if requested they charge like a bitch ($140ish)

Cleaning it does help, Cleaned it on my 2nd gen and throttle response was fantastic. Couldnt beilve the difference it made..

Talk about a thread mine, try a search or new thread before re-opening a 3 year one

Talk about a thread mine, try a search or new thread before re-opening a 3 year one

I was under the impression that an old thread can be "mined" if it is applicable or new/relevant information can be added. Pretty sure if Life had just posted a new thread asking what he did he would have been told to search :confused: I mean its not like he just spammed an old thread

EDIT: further there was a post in here earlier today having a dig at Life about mining a thread, its now not here so im guessing a Mod/Admin has deleted it, so what is the go, is what Life has done right or wrong?

Talk about a thread mine, try a search or new thread before re-opening a 3 year one

How do you think I found this thread, and why would I create a new one? **** talk about nazis.

On a positive note, thank you paul. Exactly what I needed to know.

I was under the impression that an old thread can be "mined" if it is applicable or new/relevant information can be added. Pretty sure if Life had just posted a new thread asking what he did he would have been told to search :confused: I mean its not like he just spammed an old thread

EDIT: further there was a post in here earlier today having a dig at Life about mining a thread, its now not here so im guessing a Mod/Admin has deleted it, so what is the go, is what Life has done right or wrong?

Both did wrong

The other poster should have just clicked report post.

And the answer to the question posed is in the old thread so there is no new info.

So, seeing as how Im a "nazi" anyway