oil cloud when running hard
 

Wondering if I get a better response here...

I thought was the AOS, so I replaced it.

Possible bad new AOS?


The car smokes on start up and clears after running about 5 mins.

under hard accel as soon as it hit 5800 RPM it will belch out a thick cloud of smoke that will cause people behind me to pull over.

Under a couple of the test drives the computer will throw a code for bank one O2 making me think it is a issue with oil scavenging out of one of the heads?

Help!

Shot in the dark, 986 is not the easiest car to get an accurate oil measure on, I don't think I ever got that dipstick out with a reading on it and the digital can't tell you if it's a hair overfull. I know this doesn't account for the o2 sensor but it's free to check.

Sounds like you have a James Bond feature for evading pursuers.
Isn't that a feature rather than a problem:p


Are those white clouds or bluish clouds of smoke?

On a typical car that blows bluish smoke when you stomp on the gas, it is the burning of excess oil in the cylinders.

The excess oil got there because:

1) Cylinder rings are damaged (blow by) or seized in their groves (Rings not sealing or scraping oil from cylinders).

2) Engine ingesting excessive amounts of oil from the AOS.

3) ?????

White Clouds = coolant getting into cylinders
Could indicate a blown head gasket or something worse (Cracked cylinder wall)

Check the coolant reservoir for oil, and check the engine oil for coolant.


Since you have already been mucking about with the AOS I would start there and make sure all the hoses are good and connections secure.

After that I would pull all the plugs and see if any are oily and black instead of a tan brown.

If you find an oily one then Fiber optic the cylinder to see if you can spot any cracks in the cylinders or head.

Beyond that its probably specialist/mechanic work.

https://www.youtube.com/watch?v=M0TSAyRs8AI

I wonder if the person at the light got thru okay?

<iframe width="560" height="315" src="http://www.youtube.com/embed/M0TSAyRs8AI" frameborder="0" allowfullscreen></iframe>

Video looks like an AOS problem. Hard to believe that a new one was bad so I'd check all of the connections, tubes, etc.

after replacing the AOS a second time it looks like I may have found the real problem.

there is a over pressure valve in the system that of all things vents to atmosphere!

If course it is not called that.

Lets see if cleaning it will help. It was all clogged up. This is why you change your oil and often.

http://986forum.com/forums/uploads01...1347128943.jpg

Well this does not look good. I took off the AOS and started the car. There seems to be more oil moving around than there should be. Am I wrong? Bad pump in the head?

https://www.youtube.com/watch?v=oQHvBhHhdQw&feature=youtube_gdata_player

<iframe width="560" height="315" src="http://www.youtube.com/embed/oQHvBhHhdQw" frameborder="0" allowfullscreen></iframe>

Yes the camera was covered in oil at the end of the recording.

I'm going to plug this port up so the AOS will be sucking from the driver's side to see what happens.

Remember this is not under load, not as high rpm, and and not under acceleration.

Blocked suction port?

Wow nice camera work. That is alot of oil really close to the AOS. What was the top rpm?? The oil scavenge pumps are pretty much off or on. They are direct drive from the exhaust cam gear driven by chain from the IMS, so if the engine is running the head scavenge pump is working.

About 4 k peak in this video. Under acceleration I guess it would be worst as the oil would pool at the back of the head.


I have no history on this car other than the owner replaced things as they broke. maybe a blocked suction port? :confused: I'll try to remove the pump today to inspect.

The underside is a mess :barf:

Well I cleaned the underside of 10 years of crap. Every time I touched the car my hands we're caKed with black crud. Hopefully this will make it a little easier to work on.

Too bad the driveway is now covered with this stuff :rolleyes:

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Oh my god what did I just get myself into?

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well i took apart the pump and it looks normal... pump pick up?

http://986forum.com/forums/uploads01...1348111575.jpg


Look at this, should the oil level be even with the bottom of the oil pump opening?

could pump pickup at the bottom of the valve cover plugged or is this normal?

Smoke looks bluish so its probably excess oil going through the engine.

Have you checked the plugs?

If one cylinder is darker then it might be a ring or valve problem.

If all are equally colored then its probably some excess oil getting into the induction system somehow.

Overfilled oil could also be suspect especially if you did any oil change or top ups right before it started.

Thanks Ray but I need some out of the box thinking on this one. Yes it is oil



Yes they are all oil fouled



nope


coming in thru the AOS

Acts just like that but the oil is not over filled.


http://986forum.com/forums/uploads01...1348158324.jpg

http://986forum.com/forums/uploads01...1348158400.jpg

I really hope you find what's wrong.
I have a similar problem, 6 month after changing AOS it started leaking, just a touch, a couple of drops every other way.. and it only leaks when I bring it to redline.

Good luck and keep us informed!

Sasha

Look at how much oil I pulled from the head, looks more than two quarts.

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Not trying to pile on and not going to help with your current problem, but in the picture showing the axle, it looks like your inner CV boot may be is torn. Is it just the picture (hopefully)?

There was a thought that one of the cam plugs was loose or had fallen off.

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This is the rear one

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Whaaa, I guess i need to make a valve cover tool and pull the valve cover off :(

Its torn, such a minor thing to the issue I have now, I wish it was the only thing I had to think about.

God I hope this works.....

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This doesn't look like a oe plug. :confused:

uh oh that don't sound good. :confused:



When looking from the tranny which way does the motor turn? Clock wise or counter?

Counter clockwise looking from the transmission end....

An observation - if the cambox is (over) full of oil, yes could you have a faulty (or inefficient) oil pump on that particular side ?? You say the pump looked OK - how did you test it?
But you probably thought of that already......

OK there is no way this can be right. I drain over a gallon of oil out of the valve cover!
Attachment 16572

Is there a port from the oil pan to the timing cover area?:confused:

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Actually the pump physically looks okay. But dunno. Normally unless this type has deep scores it is good.http://img.tapatalk.com/d/12/09/22/mugazudy.jpg

Could I have the wrong pump on there?

As in a front pump in the rear or two front pumps?

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HS
As you probably know, there are 3 oil pumps, one in the crankcase and one in each cambox / valve cover.
If you drained a gallon (+/- 4 litres) of oil from ONE valve cover, that's nearly 50% of the total engine oil capacity.....
What does the oil level on your dipstick look like after everything has cooled and settled ? Low?
Looks to me like something ain't right with the oil scavenging pump or oil return path - where does the pump discharge to?
Perhaps one of our resident professionals can chime in on this....

You could also have an obstruction inside te engine oil passages that return the scavenge oil from te cylinder head into the crankcase and then down to the swirl pots to be defoamed.

We see intake valve stem seals go bad that cause as much oil consumption and chamber contamination as anything else, which is something else to consider.

The pumps are also installed incorrectly in their bores or the body is disassembled and phased incorrectly into the housing. If these things happen it won't move any oil.

Jake might be on to something:

What oil are you currently using?
Have you always used this oil?
Could it be oil foaming at high RPM that is causing an oil pumping problem?

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Well this sucks. I really hope I changed the clocking of the pump in the housing by mistake when I inspected it. I spun the shaft clockwise (looking at the shaft) in oil and it blew out oil from the correct port. I blew air into the valve cover pickup port and no blockage. I pulled the pan and blew air into the output pressure port and air came out freely from the drivers swirl pot.

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Can these pumps stall or can a air bubble cause the pump not to suck oil? I wonder if a lighter oil would help.

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Jake, have I covered all the things that can go wrong? the cam plugs seem intact. :confused:

The oil in the intake and AOS basically tells me the valve stem seals are not the issue.

http://986forum.com/forums/attachmen...oil-pumpon.jpg

This picture almost looks like there is an arrow drawn the other direction in black marker. :confused:

Could the pump just have a low output causing it not to keep up with the oil buildup? Or maybe a oil passage port plug has come loose,or not not installed correctly?


Somebody really hates me!!!!!!

http://3.bp.blogspot.com/_8aXXVO21GL...rying_baby.gif

I think I will put this back together and cross my fingers... Yeah that will help.



Then pull the motor, find a way to pressurise the oil system and look for abnormal leaks in the head. that or just bypass the AOS system.

HS
If I'm reading this right, your valve cover (cambox) is over full of oil, so that means its filling OK from the main oil pump but not being pumped out by the cylinder head oil pump.

Before pulling engines wouldn't it be prudent to test the pump output on the bench (or even swapping / comparing pumps with the other cylinder) and if OK, pressurize the pump discharge port in the head to make sure that there is no blockage downstream of the pump.
Even oil from a hand operated oil can should be able to create enough pressure to see if the oil discharges into the sump.....