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Hi there
As the title says the oil consumption on my EJ9 (engine is D14A3 and has 251k km) is enormous if i drive it into revs.
Upon inspection of the engine i found out this:
– intake manifold is all oily inside
– breather box is a bit oily (can see it underneath intake manifold)
– no signs of oil on the outside of the engine itself
– back of the car has small black particles which are still a bit oily
– no smoke on higher revs so i guess valve stem seals are still okI wanted a second opinion about this but i suspect the seal on breather box or PCV valve… or both ?
Thanks for answers and greetings from slovenia
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I would clean out the PCV and all other breathing components. My friend did that to his 91 Civic Si Hatch the other week and reduced all the oil coming from his exhaust. However, he wasn’t consuming much oil at all (1/10th of a quart a month). If it’s consuming a lot of oil (like a quart a month or more) it’s likely to be the piston rings with the engine having 250k miles.
actually if i’m very nice to it… meaning i shift at about 3k rpm it consumes almost no oil… like you mentioned very little amount.
but sometimes you need to beat it a little 👿 … it’s rev happy engine afterall :whistle:
and it’s 250k kilometers not miles 😉
The oil in the intake is pretty much a dead give away. What happens at higher RPM’s, the blowby past the rings is too much for the PCV system to handle, exhaust gases push back through the PCV hose into the intake tube, and carry oil with them.
There are a few companies that manufacture oil catch cans which are supposed to help with this, though I can not vouch for how well any of them might work, as I have never tried one.
actually oil seems to come from the valve cover too… you can see a small trace of oil below the air filter so i wouldn’t call out piston rings just yet in my book 🙂
[quote=”dhbiker” post=106287]Hi there
As the title says the oil consumption on my EJ9 (engine is D14A3 and has 251k km) is enormous if i drive it into revs.
Upon inspection of the engine i found out this:
– intake manifold is all oily inside
–I wanted a second opinion about this but i suspect the seal on breather box or PCV valve… or both ?
Thanks for answers and greetings from slovenia[/quote]
The intake manifold is oily because excessive oil is being drawn through the PCV system and into the manifold. I suggest that is a part of the cause of higher oil consumption at high rpm.
If you check the PCV and the hose to the inlet manifold you will no doubt find them oily and the valve itself partially sludged up so it cannot operate optimally.
The first thing I would do is to renew both the PCV and the PCV hose. Only use PCV hose, never fuel hose or vacuum hose for this.
(Someone above mentioned a catch can. These are installed on the PCV hose line between the PCV and the inlet manifold to catch oil drawn through the PCV.
This will keep the inlet manifold cleaner but will not fix your problem. It will just see most of the oil now being drawn through the PCV deposited into the catch can instead of the inlet manifold. They are designed to simply keep the inlet manifold fairly free of oil deposits and to keep oil vapors out of the combustion chamber. Much of the oil vapor is “condensed” in a can equipped with steel mesh material and is retained in the can. At least that is how they are supposed to work. Only the remaining gasses are supposed to escape from the catch can through the hose connected to the inlet manifold.)
One of the effects of bad piston rings is increased pressure in the crank case. Typically, the first thing that it does is force oil out past any gasket that might be weak, or already compromised, so valve covers / spark plug tubes / oil pan / distributor seal, etc. Once you’ve shored all those up, more oil goes through the PCV system, and into the air intake.
By no means was I suggesting that an oil catch can would fix the problem. When this happens, the only fix is a re-ring, or an engine swap, but Honda engines notoriously run for a very long tine, even after wearing to this extent.
Installing the oil catch can MIGHT make the car much more drivable, keeping the burning oil from clogging up the Catalytic converter, sludging up the intake, and causing all sorts of other havoc on it’s trip through the engine.
interesting since there still isn’t any sign of being worn out power wise. but yeah as you said Tomh honda engines are stupidly realiable even in this condition.
so first thing after the rain stops is cleaning of breathing components and along the road maybe a rebuild, since the block itself is still like new.
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