Compression test, piston rings, head gasket
Thread Starter
Senior Member
Joined: 03-17-2012
Posts: 1,042
From: Bay Area, CA
If each cylinder psi stays the same with the thicker oil and/or with the oil in the cylinder trick, could it be related to the turbo? Is there a line/fitting in the turbo I should check? Or a rebuild kit? Car has good power. I'm hoping it's not the rings.
Administrator
Joined: 10-13-2011
Posts: 39,986
From: Welland,Ont Canada
No not related to the turbo , the oil in the cylinder is to temporary seal up the rings, if compression numbers are higher, is the rings, now seeing the mess the oil was in when you removed the valve cover , it is plausible the Lucas cleaned some of it up.
run it awhile like you have been doing. Do another compression test in 500 or 1,000 miles, give that Lucas time to work.
Moderator
Joined: 05-01-2014
Posts: 8,509
From: California
If the rings check out to be ok, then the oil in the exhaust could potentially be from the turbo, if it's actually oil. Typically white smoke is steam, from water/ coolant. So continue to monitor the oil and coolant levels, if you're losing fluid, that could be a good indicator of what is causing the smoke.
If the rings check out ok, the low compression is likely a result of gunked up intake valves, a by-product of direct fuel injection.
If the rings check out ok, the low compression is likely a result of gunked up intake valves, a by-product of direct fuel injection.
Senior Member
Joined: 04-06-2020
Posts: 1,054
From: Missouri
If the rings check out to be ok, then the oil in the exhaust could potentially be from the turbo, if it's actually oil. Typically white smoke is steam, from water/ coolant. So continue to monitor the oil and coolant levels, if you're losing fluid, that could be a good indicator of what is causing the smoke.
If the rings check out ok, the low compression is likely a result of gunked up intake valves, a by-product of direct fuel injection.
If the rings check out ok, the low compression is likely a result of gunked up intake valves, a by-product of direct fuel injection.
Senior Member
Joined: 03-29-2022
Posts: 1,240
From: Davison MI
Valve seals will not give you smoke under load once it's warmed up. They will do the blue smoke at a cold start. The seals would have to drop to get smoke after it warms. That is likely rings.
Moderator
Joined: 05-01-2014
Posts: 8,509
From: California
That's from the PCV system, and the source of the aforementioned gunk on the intake valves. It does not mean something is wrong with the turbo.
Why are we spending so much time in hypotheticals, please just do the wet compression test, and we'll go from there.
Why are we spending so much time in hypotheticals, please just do the wet compression test, and we'll go from there.
Administrator
Joined: 10-13-2011
Posts: 39,986
From: Welland,Ont Canada
Seems the turbo is a focus of could it be theory’s, if you just change the turbo , you’ll still have the oil issues.
as RJ states , do the wet test, the one with oil in the spark plug holes. Maybe the Lucas has loosened up the rings? Maybe not, you have to test it to find out!
as RJ states , do the wet test, the one with oil in the spark plug holes. Maybe the Lucas has loosened up the rings? Maybe not, you have to test it to find out!
Senior Member
Joined: 12-05-2014
Posts: 3,352
From: Northern Ohio
He says smoke when decelerating, high vacuum. Isn’t that how you suck oil from bad intake valve seals?
