Oil in the intake plenum

[tnmk]

So I finally got motivated enough to start tearing apart the engine to replace rings and valve seals.

When I got the intake plenum apart there was a big puddle of oil in there. What is this from? I replaced the PCV valve, so where else could this be coming from?

Could this be the main cause of my burning oil? It was accumulated more on the 3&4 cyl side of the intake which are the 2 cylinders that have the white ash on the plugs.

I never noticed smoke on start-up. Only when revving the engine.

[stubborn1]

Sounds like it could be blow-by from worn out rings. Did you run a compression test before tearing it down?

[tnmk]

How would blow-by from the rings get into the intake?
And yes I ran compression tests. All around 195-205 psi

[94_Rolla_Guy]

don't worry about it, it gets in through the PCV system, i have a picture of the same thing, it isnt enough to cause any substancial oil burning.

it amounts to maybe 50ml or half a shot glass every oil change, i know from my catch tank.

every now and then during hard acceleration it will spill over into the runners and leave a smoke cloud...

just keep on motoring with the rebuild nothing to worry about...

[freakinbox]

change the pcv valve?

[Flashmn]

PCV and EGR both contribute to shit in the intake. PCV much less so.

[tnmk]

where is the egr on this car. 1.6L

Freak-please read the first post. You wouldn't have to ask that Q.

And in no way meaning any dis-respct to you freak, I really don't trust any of your opinions, so if you would kindly keep your comments to yourself. (I have a habit of being blatantly honest)

94 rolla and flshman are the 2 I've come to trust the most in this forum. At least as related to the topics I've posted.

[94_Rolla_Guy]

changing the PCV valve may and may not help, on my car it makes almost no difference... addding a catch tank helps out it keeps the intake clean but the problem i have is that i cant find stiff enough tubing, that doesn't colapse under vaccuum and heat...

I also saw the compression test results.... they look rather familiar,

Oh if your car is 93-95 federal or canada im %95 sure it wont have a EGR, if its california engine it will

[Flashmn]

EFI fuel line should not collapse.
Anyhow, the EGR is on the intake manifold, theres a channel in the EFI head that has the EFI port.

[tnmk]

Thanks

[freakinbox]

just because you replaced it doesn't mean the one in there isn't faulty, I don't have this problem with my 4af, maybe it's a 4afe issue? or a later 4afe issue?

thicker rubber hose might stop it from colapsing

[stubborn1]

Originally Posted by tnmk

How would blow-by from the rings get into the intake?
And yes I ran compression tests. All around 195-205 psi

Just a follow up - Blow-by from worn piston rings can leave deposits thru the PCV system. Combustion pressure can leak past worn rings pressurizing the crank case beyond normal levels forcing some of it to travel thru the PCV system and leave deposits in the intake.

[diver9000]

Hey Tnmk,
So whats the latest and greatest? I really wasn't asking and I did read your posts. (hehehe) So which engine are you tearing down? 4age or a 7afe?

[rice]

^neither, tmmk is tearing down a 4afe

im with 94 rolla, i dont think his 4afe have an egr, mine dont 94' 7afe

[94_Rolla_Guy]

yeah i agree excessive blow by might be helping but i donno how concerned id be with 195-205 psi compression, if it was like 130-150 then i would say yes.

another thing that could contribute is partially plugged oil drains theres 4 they go from the head down into the bores where the oil hits the crank and gets splashed onto the cylinder walls...

If they plug oil will collect in the head and get sucked into the intake...

What id do after the rebuild is id add a catch tank and see if your still collecting oil i will post a pic of mine it cost like $15 to make...