Turbo and exhaust blowing smoke after oil line slip.
#1
Turbo and exhaust blowing smoke after oil line slip.
So last Monday I bought a 1990 Mazda Miata. It had a Greddy turbo kit on it, and it all works great. Yesterday I was driving down the freeway in 5th gear at about 80MPH when I saw white smoke coming from under the hood. I got off the freeway and stopped in a parking lot, I looked under the hood to find an oil hose had slipped and sprayed the turbo and what not with oil.. I put the hose back on and got a metal clamp so it wont happen again.
Here is the hose that slipped
oil.jpg?t=1345684849
Now I figured it wouldn't be a big deal but when I started the car again smoke flows out of the tail pipe and the turbo and the engine was running bad, shake a lot and sputter when I let off the gas. This morning I went out after letting everything cool off all night and all the lines are good and not leaking anywhere. I started it up and the engine runs normal now, normal pressure and revs. But still getting smoke out the tail pipe and the turbo.
NOW! Before you all blow your loads. I did do my home work and looked up the problem. I found a lot of people saying it can be three things; a bad seal, clogged drain, or too much oil pressure.
So my question is, wither its one of those things or if it is possible that some oil got sprayed into the turbo some how and is now just burning off.
Thanks,
Murph
Here is the hose that slipped
oil.jpg?t=1345684849
Now I figured it wouldn't be a big deal but when I started the car again smoke flows out of the tail pipe and the turbo and the engine was running bad, shake a lot and sputter when I let off the gas. This morning I went out after letting everything cool off all night and all the lines are good and not leaking anywhere. I started it up and the engine runs normal now, normal pressure and revs. But still getting smoke out the tail pipe and the turbo.
NOW! Before you all blow your loads. I did do my home work and looked up the problem. I found a lot of people saying it can be three things; a bad seal, clogged drain, or too much oil pressure.
So my question is, wither its one of those things or if it is possible that some oil got sprayed into the turbo some how and is now just burning off.
Thanks,
Murph
#11
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,501
Total Cats: 4,080
I just dont like catch cans.
but, the main issue seems to be that boost is leaking past your PCV (other side of valve cover) and this is pushing oil out the other side. That's why oil was spewing out.
Nothing but oil vapor should be exiting that breather line back to the intake. The catch-can is there to collect oil that may make it's way through.
If the PCV is stopping boost from entering the crankcase, then no oil should be exiting the breather...unless you have bad rings that allow too much blow-by.
but, the main issue seems to be that boost is leaking past your PCV (other side of valve cover) and this is pushing oil out the other side. That's why oil was spewing out.
Nothing but oil vapor should be exiting that breather line back to the intake. The catch-can is there to collect oil that may make it's way through.
If the PCV is stopping boost from entering the crankcase, then no oil should be exiting the breather...unless you have bad rings that allow too much blow-by.
#15
Also, I just noticed that the exhaust is spraying oil. And the smoke coming from the turbo is coming from the bottom of the exhaust Manifold where it look like it is wet.
So I have come to the conclusion that is a bad seal. Thanks for the help everyone.
So I have come to the conclusion that is a bad seal. Thanks for the help everyone.
Last edited by Murph; 08-24-2012 at 07:10 PM.
#16
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,501
Total Cats: 4,080
pics?
ive seen catch cans causing a pressure drop on the breather line so it becomes pretty much blocked which makes the oil return back-up (due to pressure build up) and the turbo smokes.
turbo seals dont just fail, what fails is the pressure differential.
where is your return line routed? around to the passenger side?
ive seen catch cans causing a pressure drop on the breather line so it becomes pretty much blocked which makes the oil return back-up (due to pressure build up) and the turbo smokes.
turbo seals dont just fail, what fails is the pressure differential.
where is your return line routed? around to the passenger side?
#17
heres some pics of the bottoms of the exhaust manifold.
C360_2012-08-24-15-37-56.jpg?t=1345862074
C360_2012-08-24-15-39-14.jpg?t=1345862098
and yes, it runs from the valve cover across the front of the engine and into the oil catch can, and the line from the intake follows the same path, then there is a line in the bottom of the catch can the drains into the oil pan.
C360_2012-08-24-15-37-56.jpg?t=1345862074
C360_2012-08-24-15-39-14.jpg?t=1345862098
and yes, it runs from the valve cover across the front of the engine and into the oil catch can, and the line from the intake follows the same path, then there is a line in the bottom of the catch can the drains into the oil pan.