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Location:
Glossodia,NSW
Registered:
May 2002
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HELP! OIL IN INTAKE PIPE
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Sat, 10 August 2002 10:12
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Today i decided to put my rampod back on instead of the factory airbox setup,when i removed the intake hose from the airbox side,i noticed a glimmer in the hose,being as i had just washed my car i thought it was water,however when i got a tissue to wipe it out,it turned out to be oil.There is a stream of it sitting in the intake hose.There is no oil in the airbox or on the paper filter,nor from any other intake related hoses.
Please someone tell me whats happening.This is not good,RIGHT!. I put new cam covers on a while ago and put a pcv valve in the breather hose cauz the cam covers i got didn't have one.The back of my car is covered in black (now i know why)and was a long time before i changed the cam covers over,i always thought my car was running to rich,how wrong was I.
Cheers Adrian
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I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
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Re: HELP! OIL IN INTAKE PIPE
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Sat, 10 August 2002 10:40
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pull all pipes off that run to the intake from the rocker cover, stick ur finger in them and see if u get oil over your finger or if it feels really greasy
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Toymods Board Member
I supported Toymods
Location:
Turramurra, Sydney.
Registered:
May 2002
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Re: HELP! OIL IN INTAKE PIPE
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Sat, 10 August 2002 11:03
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Get rid of the PCV valve, 4A-GEs don't need them. As far as I understand to use a PCV valve (although it's really a PC Valve isn't it) you need 2 breather hoses from the cam covers, 1 to behind the airfilter but infront of the throttle body, and 1 with the pc valve infront of the throttle body.
PCV is just a 1 way valve, so without the other hose it won't work.
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Location:
Wollongong
Registered:
July 2002
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Re: HELP! OIL IN INTAKE PIPE
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Sun, 11 August 2002 08:55
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check the pcv valve, as they can get stuck and let oil through, they aren't just a one way valve they are to let gasses through and not oil, hence the name Positive Crankcase Ventilation...
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Location:
auckland new zeland
Registered:
August 2002
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Re: HELP! OIL IN INTAKE PIPE
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Mon, 12 August 2002 07:23
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pcv = positive crankcase ventilation
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Location:
Glossodia,NSW
Registered:
May 2002
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Re: HELP! OIL IN INTAKE PIPE
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Mon, 12 August 2002 08:26
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After further investigation,iv'e come up with some unusual discoveries.
1.With the car going I removed the entire intake pipe so i could see inside the throttle body.Now looking at the throttle body on the airbox side(with the butterfly closed,sitting at idle basically) there is three little holes visible.The one that is closer to the engine (not the firewall) was actually seaping oil out of it.As soon as i wiped it clean,it would seap out again.
2.Firstly Iv'e put a 4age 100kw engine in my car from the standard 88kw.On the 100kw cam covers you have a little exit pipe(the cover closet to the inlet manifold).Off this there was a little black piece of hose which ran up to another little pipe which came out of the inlet manifold.According to the corolla workshop manual this is called positive crancase ventilation.Where built up or excess combustion gas which escapes into the head is recirculated into the inlet manifold for combustion again.There is supposed to be a PCV valve which controls the flow of excess gas and stops the oil from reaching into the inlet manifold.WHERE THE HELL IS THE VALVE? in the pipe it is clear and on the cam covers it's clear.Is it in the inlet manifold???? Also there is greasy oil residue in the hose and a bit of gunk in the little pipe on both sides (cam cover and inlet manifold)
3.I've changed the cam covers over to some flashly red powdercoated ones. The cam covers i have are obviously special ones.There is no little pipe coming out of any cam cover,a threaded pipe has been welded into the bottom one(closest to the radiator).I attached a piece of hose with a threaded fitting at one end to the cam cover and then the other end back up to the inlet manifold pipe.I Put a PCV Valve in this inline with this hose which i got from Auto1.
4.Also if it is runnig rich,how do you adjust the mixtures.You can't can you? Everytime i take it to the mechanics it comes back the same. My engine is map sensored so i can't adjust it.Wolu d i have to spend $500 and get some sort of fuel management computer
SO TRY AND FIGURE THIS ONE OUT GUYS.
I'm sick of wasting my money on mechanics for them to tell me it's just runnig rich,when i discovered this on the weekend,i don't know what to do.Should i just ditch this engine and go and get another from the importers???
Cheers Adrian
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Location:
newcastle
Registered:
May 2002
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Re: HELP! OIL IN INTAKE PIPE
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Tue, 13 August 2002 15:06
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hi i dont know any thing about 4ages but i do know that crankcase ventilation is basically clean air in one end and dirty air out the other end into the manifold after the throttle body.
so if there is a pipe a threaded hose end or anything like this in the top this is usually air in from the air filter.
there will then be a lower hose end witch will run directly to the manifold.
the hose that runs to the manofld is the one that needs the pcv valve in it .
now with that said ,the size of the hose to the air in can make a difference as can the size of the hose to the manifold and the size of the hole through the pcv if the size of the hose and the pcv are bigger than the air in then this will cause the manifold to actually suck harder throught this hose causing it to suck oil as well,this is usually seen out the exaust pipe as grey smoke not black and usually only at hight revs.
so hoses should be around the same size or air in should be bigger.
if the hose to the manifold is close to the throttle body and not directly to the manifold then this could cause the seep u talk about how ever im not a machanic so if im wrong any where here plz correct me ,hope i could help.
as for black smoke maybe your sucking the guts out of the motor therefore the ecu is adding more fuel thats not getting burnt
just a thought.
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I supported Toymods
Location:
melbourne.victoria.austra...
Registered:
June 2002
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Re: HELP! OIL IN INTAKE PIPE
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Tue, 13 August 2002 22:14
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um, the 100kw 4AGE doesn't use a valve as such.
sure there is a breather hose that goes between the inlet plenum and the rocker cover closest to the inlet plenum.
there is also a drain at the back of the head (firewall side) to drain oil from the head back into the block. i'm not aware of there being a valve in any of these applications.
if you're getting excess oil into your inlet manifold, i'd suggest checking what viscosity of oil you are running i had this problem running thicker oils years ago in an old suzuki where it would choke the car to death. when i ran a lighter synthetic it was just fine.
the purpose of the PCV is to take unburnt gases in the head and recirc them back into the inlet tract and re-burn them in the combustion process.
if i play with the PCV system on my TA22 ie: block the hose, i get black smoke coming out of my exhaust in a big way.
there is a way around this - use a catch can - push the dirty oily air into a canister filled with stainless steel gauze, then take the (cleaner) air from the same catch can and put it back into your inlet manifold.
replacing your engine may not rectify the situation, how is your compression by the way? done a leakdown test of late (may be worthwhile checking maybe in fact you are burning oil for example or has your engine been recoed - just a thought)
hope all this helps somehow.
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