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Shouldnt this be clean?
Posted 23 June 2006 - 11:00 PM
The inside of the plenum is covered in a dusty/oily crud, as ive never stripped down a FI car before i have no idea if this is normal after 260,000kms. So the questions are, is this where my oil is going? There are no obvious external leaks and the car doesnt smoke. Should i bother cleaning it? and if i should, how?
I know its not a subaru but you guys are usually good.
Posted 24 June 2006 - 06:58 AM
Cougar brought up a good area to consider; a stuck PCV valve (open or closed) can cause lots of engine problems. Even if the PCV is operating normally, it can create some "interesting" conditions.
[...]The inside of the plenum is covered in a dusty/oily crud, as ive never stripped down a FI car before i have no idea if this is normal after 260,000kms. So the questions are, is this where my oil is going? There are no obvious external leaks and the car doesnt smoke.
I don't know what vehicle we're discussing, but if it's losing oil and it isn't leaking out, then it must be being burned, whether that's obvious at the tailpipe or not. With the mileage you mentioned, there could be significant blowby. If so, that could be giving the PCV system lots to contend with, and in addition to exhaust gases aerosolized oil might be being fed to the intake. On many cars, temporarily disconnecting the PCV at the crankcase end (valve cover, wherever) will allow any significant blowby that may exist to be observed.
On the other hand, there may actually be a slow external leak that isn't obvious when the engine isn't running or at idle. If the PCV system (valve, hose, etc.) has gotten plugged, crankcase pressure can build up. That can force oil out of places it might not normally leak; it will usually be worse at higher RPMs, meaning that it might lose a drop every so often on the highway, but not show up in your driveway.
Posted 24 June 2006 - 11:17 AM
Posted 24 June 2006 - 11:37 AM
I too vote for a bad PCV valve. Be sure to use OEM to replace it, do NOT use aftermarket.
Posted 24 June 2006 - 03:01 PM
Posted 24 June 2006 - 04:08 PM
If so, then the rapid buildup is normal because the PCV system becomes non-functional at WOT. Just clean it off periodically.
You'll probably get a lot of blowby oil in the front portion of your air-box too.
Posted 24 June 2006 - 04:19 PM
Posted 24 June 2006 - 07:13 PM
Posted 24 June 2006 - 07:22 PM
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