Intake Manifold Inside Coated in Gas/Oil!

It was bad (no pics), but it was almost to the point of dripping out...

PVC valve bad? I pulled it and it was pretty gunked up. I sprayed it down with some cleaner spray (inside and out) and replaced.

Im hoping that was the issue but what are other symptoms I need to be aware of? Bad piston seals?

Needless to say, catch can install has been bumped up in priority.

 

I think the catch can will help reduce that problem a fair bit although even with the can , I have seen the intakes fouled but to a lesser degree. Usually an uneven distribution of deposit in the different cylinder's intakes which I've always found odd.

Anyone I know who has a can installed (between PCV valve and intake manifold) has been amazed at how much oil they collect. I made one using a air compressor water trap. I wanted to be able to see how much oil was in there so would know when to empty.

 

Using a air comp. water trap is a great idea! You should do a "mod" thread.

 

I get a pic and post, that should pretty well explain it.

 

Im doing an oil catch can that vents to the atmosphere and plugging up the valve on the TB so I dont have to worry about that anymore.

However, while Im pretty certain it was caused by a bad PVC valve, it was A LOT and Im concerned it wasnt just the PVC valve. Just wondering if anyone else had this happen . I hope the cylinder seals are good...

 

Damn, was it smoking blue out the tail pipe??

 

No ...

 

Pretty sure that you will get codes and fail emissions if you don't keep that vacuum circuit intact. Not sure how strict they are in VA.

The catch can will get most of it and these engines run 300+ K miles without any modification at all so pretty sure you'll be fine with getting most of that oil out.

 

It shouldnt do either . I havent made up my mind yet how Im going to configure it. I still need a custom plate made to hold the catch can (and fuse box).

 

Do this.

http://www.tacomaworld.com/forum/performance-tuning/312623-oil-catch-can.html

 

The issue with having a return on the catch can is Ill be in boost and there will be lots of pressure from the TB feeding into the PVC valve. I want to have them isolated.

But again, original concern is piston seals... Can a bad PVC valve cause that much oil blow by?

 

Do you have restricter on oil feed side of turbo and large drain from turbo? Do you know turbo seals are good? I blew seals out of two brand new name brand turbos before I realized that restricter was not in the feed to turbo. If oil is blowing past turbo seals oil may be in compresor discharge side, turbine side, or both. If no oil in turbo should start looking at line routing to ensure it is correct. Also run lines to catch can and monotor how much oil getting through. This will indicate if you need to dig deeper.....

 

No turbo installed yet...

 

Oh ok sorry. Narrows that down then! Get that catch can installed and see what ya get in it. Also monitor the inside of your intake mani/plenum to see if or how fast it gets dirty again since you cleaned it. if it gets dirty fast and/or collects a lot of oil in can there may be other issues. How much is too much?..... That is the question.....

 

If your Cats haven't plugged yet and no major codes are being thrown and you aren't noticing it burning oil.

its probably not rings.

That said..

depending on how much boost your wanting to run, and granted right now you haven't experiance boost so you don't have the boost bug so you're probably thinking "5-7psi is enough, i won't go any higher.." well that a lie haha so if you even THINK you'll be running more boost then that...pull the block and open it up and check the rings your self.


welcome to boosting

 

A bad PVC would definitely do that.

A compression and Leak down test on rings if you suspect those. Engine stays assembled.

Compression test is blunt numbers and a good quick check, but a leak down test will tell you the percentage that gets past the rings, or valve seats.

 

You will most likely (Though I won't say 100% guarantee) result in a lean/rich code if you do that. The computer has pre-calculated in the amount of air mass drawn through the PCV valve into the intake. If this amount of air is missing, then the computer will set a fault, resulting in a rich code, because the amount of air entering is less than the amount of air that SHOULD be entering the engine. Since you will be boosting, the best thing to do is install a small check valve in the line between the vacuum port, and the catch can. Something similar to the check valve in your brake booster line would be the right size and pressure most likely.

 

Haha, I keep telling myself that... Thanks for the reasurance. I baby the engine so wasnt too concerned but damn that was a lot of oil Working the catch can/fuse box bracket today and hopufully finnish wiring.

Good call. Probably do that this weekend just to be sure. Thanks!

 

Or get forged internals and go crazy!!!


do it do it do it do it do it do it do it do it...

 

I should be able to clamp/adjust what my ECU sees with the FIC and tune off the FIC's MAP sensor... Ill try the vent first and can easily add the hose if the FIC doesnt cut it. Ill have to find a check valve if I plan to keep the hose when in boost...

pay for it pay for it pay for it pay for it pay for it pay for it pay for it pay for it