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Oil in intake manifold and plenum
Posted: Tue Mar 20, 2012 11:36 pm
by Rob Furniss
Can anyone tell for sure from these pics what my problem is?
Like does this mean it's burning oil (or is that impossible due to where it is?), or is it oil getting in the intake plenum from the crank case breather (which is also oily) as the plenum is also the same?
Re: Oil in intake manifold and plenum
Posted: Wed Mar 21, 2012 3:24 am
by spetz
This happens with age.
You need something like "seafoam" upper engine cleaner, or what a friend used with great success is a Subaru product which is called "upper engine cleaner".
You can get it from Subaru, as it is part of scheduled servicing for them.
It works really well, you spray it on and it froths up and you can see how it just gets rid of everything. Impressive stuff.
Re: Oil in intake manifold and plenum
Posted: Wed Mar 21, 2012 3:29 am
by Rob Furniss
spetz wrote:This happens with age.
You need something like "seafoam" upper engine cleaner, or what a friend used with great success is a Subaru product which is called "upper engine cleaner".
You can get it from Subaru, as it is part of scheduled servicing for them.
It works really well, you spray it on and it froths up and you can see how it just gets rid of everything. Impressive stuff.
Oh ok, i've seen it on previous FTO's but not this bad, pretty normal then and not a sign of a problem per say?
Re: Oil in intake manifold and plenum
Posted: Wed Mar 21, 2012 6:47 am
by Bennoz
Yeah looks pretty normal to me. If you really want to stop it happening as much, ditch the crank case breather off the intake. Run it to a catch can instead.
Re: Oil in intake manifold and plenum
Posted: Wed Mar 21, 2012 12:54 pm
by Rob Furniss
Ok thanks guys, that's one less thing to worry about - well I will sort it with a catch can later but at least it's not a sign of a major problem.
Re: Oil in intake manifold and plenum
Posted: Fri Mar 23, 2012 5:57 pm
by payaya
Looks like three of your banks are running richer than the others.
Re: Oil in intake manifold and plenum
Posted: Fri Mar 23, 2012 6:02 pm
by Bennoz
I.e 1 bank. Quite normal considering the restrictive joiner between the 2 fuel rails.
Re: Oil in intake manifold and plenum
Posted: Fri Mar 23, 2012 6:32 pm
by Shane001
payaya wrote:Looks like three of your banks are running richer than the others.
How can you possibly tell that from those pics
Re: Oil in intake manifold and plenum
Posted: Fri Mar 23, 2012 9:05 pm
by payaya
Shane001 wrote:payaya wrote:Looks like three of your banks are running richer than the others.
How can you possibly tell that from those pics
The amount of carbon build up on every second cylinder, so one bank is running richer than the other. Maybe different spark plugs on one bank?
Re: Oil in intake manifold and plenum
Posted: Fri Mar 23, 2012 9:26 pm
by Shane001
payaya wrote:Shane001 wrote:payaya wrote:Looks like three of your banks are running richer than the others.
How can you possibly tell that from those pics
The amount of carbon build up on every second cylinder, so one bank is running richer than the other. Maybe different spark plugs on one bank?
Or could simply be due to the camera angle on each bank and the plenum being angled for a V6 engine
