Air blowing back from the manifold 2.8 hilux

I just went out and checked my car. There is a hose from the rocker cover to the intake manifold. I take it this is the ERG valve. If this was blocked then the crankcase pressure not enter the manifold, it would come out of the oil filler on the rocker cover (IMO). Check by taking take the cap off.

There is no other way air can get into the intake with enough pressure or volume to come out of the snorkel while the engine is running.

I tested mine on a fast idle of about 1100 rpm. There was definite suction at the snorkel that does feel, to some extent, like air rushing out. But it is definitely suction.

Check it again - with a small piece of tissue (don't let it go) and it will confirm suction or pressure. What made you come across this again?

I just went out and checked my car. There is a hose from the rocker cover to the intake manifold. I take it this is the ERG valve. If this was blocked then the crankcase pressure not enter the manifold, it would come out of the oil filler on the rocker cover (IMO). Check by taking take the cap off.

There is no other way air can get into the intake with enough pressure or volume to come out of the snorkel while the engine is running.

I tested mine on a fast idle of about 1100 rpm. There was definite suction at the snorkel that does feel, to some extent, like air rushing out. But it is definitely suction.

Check it again - with a small piece of tissue (don't let it go) and it will confirm suction or pressure. What made you come across this again?

its a 94 model. 330Km on the clock,

It does 8.5 L to the 100 OR 11.7 km per Litre of diesel..

bear in mind its a 2 wheel drive. Dual cab. (2 wheel drive with snorkle, Yeah i know!.. things you do when you were young :0).

could u tell me more of the EGR valve.. how do it get to it ..etc..
What do U mean by replacing the hose? its not damaged...

thanks.

The OUTside of a hose may look ok but the INside oily rotten/delaminating (inside layer collapsing) and blocking air flow. There are only so many heat/cool cycles any rubber can take before it fails? Does the hose feel softer near the engine end , good indication. Then again hoses can get hard and brittle. If it looks fairly original (14 years) its sure to be stuffed. If its been serviced properly the engine shud have plenty of life left in it. Problem is most (?) people seem to think if it starts and runs it doesn't need servicing. As a result the engine starts to consume itself, first thing you notice is an increase in oil consumption particularly on a long trip. The EGR is the breather that makes sure that the gasses that get past the piston are re consumed via the inlet side. Oil and carbon deposits can block that valve. It will be on the top of the rocker box....silverback

maybe I should make myself clearer, I am not experiencing any problems with the Car.

Its just that out of curiosity I unplugged the hose...

David, just a question here...

the EGR outlet... is the hose comming out from my rocket cover right?

And the other end goes into my manifold right?

I just wanna make sure we are talking abt the same hose.. the size of it is 2 cm in diameter yeah?

What I dont understand is... why when I unplug the end that is on my manifold.... out from that hose connection.. Air is blowin out... Should not It suck... Cos the engine is Sucking All the air in ?

Before doing a 4WD course I would do a at TAFE course on servicing of a motor vehicle, a well run course will cover these things you can save yourself big money and in a 4WD potentially much more. Diagnosing an engine problem requires the same information a doctor requires of a patient...not serviced just like drinking excessively/smoking.....hope you have success...silverback

I am not too worry bout the snorkle... Thats all good like you said, just pulsating..

But the hose connection thats directly ontop of the intakre manifold... when The hose is off... ITs full on blowing air out.. :) ?

My 2.8 even when the motor was new pulsated through the inlet and the breather is there to relieve crank case pressure and I feel with the K's it is quite normal.
A petrol vehile might run approx. 160psi of pressure in a cylinder where as yours would be 450psi give or take (Not sure of exact 2.8 figure) so one would figure that a breather on a diesel should have 2-3 times the pressure of a petrol one. I wouldn't worry too much, if it,s doing all the right things then just enjoy driving it and have it checked by a professional if your worried.

Yeah, I follow wat ye saying, its just funny to see that there is presure comming back out of the intake manifold thats allo, I'm not gonna worry bout it...

Its just that I am working on A Hydrogen project, kinda like a hydrogen hybrid.. I need to feed the hydrogen into the intake manifold.. and discovered the pressure there.

Me car is already running on 100% waste Vege oil (not Bio) .. Anyways..

Sounds like normal air pulsation of the 2.8 diesel

Often this can be the cause of snorkle resonance particularly at 2500rpm.

so tell us more about the vegy oil setup you have.
ps, with normal running, there will be positive air flow into your motor, as a diesel dose move alot of air, and your hydrogen setup will be able to feed your motor.

Trains

the vege setup is straight forward, had it for 4 years now.

basically got me a Red PLastic boat fuel tank (takes up me room in me tray) and inthere I got a oil cooler laying at the bottom.. of cos had to cut a square in the fuel tank Top...

Heating the Oil..
Ran the coolant hose into the back of me tray and into the Boat tank where ti circulates thru the Aluminium Oil cooler.. Thus heating the vege oil as it sit at the bottom of the tank.

then of cos there is the fuel line.. from the Boat tank to a soleniod... where I can select to run Diesel or Vege oil...

So there is totally 2 seperate fuel line.. and as for the Return of the fuel form the Fuel pump.. I caped off the one going into the Diesel fuel tank under me ute... Then from the fuel retrun at the pump. I tee it back to to a point before the pump.. SO that means fuel Wether it be vege or diesel it will keep circulating around the fuel pump..

Presto! done.l

NOTE.. Needs to start on Diesel... to warm the oil up.. I got me a tamp guage of the oil.. Summer takes 5 mins.. Because I ran the vege fuel line.. right next to the 2 coolant lines that I taken to the back of the try.,. got it all warps into one Big Hose.. MEaning 3 hose in one.. full contact of all three hose.. Houses in a thick rubber HOSE.. (got me from the Usa) ...

TO turn off.. U need to run the last few Km's with diesel.. So u can start up in the morning again.,.. etc..


Hydrogen Gas..

Working on a cell to generate the gas.. still in early testing R&D stage....
Working out the Amps draws..etc.. many things effects it..

so yeah..

Excellent, have you got any pics of the setup??

I like the idea of the trans cooler for heating the tank.
If you have a larger tank, an aircon evaporator unit, or heater unit would work well too.

Trains