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D5 Oil residue in inlet manifold

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Old Oct 11th, 2017, 21:37   #1
AdventureDriver
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Default D5 Oil residue in inlet manifold

On my CX90 2004 D5 with 240.000 km I found a huge oil residue buildup in the inlet manifold and the hose and aluminium tube before that. The source of the oil is from exhaust gas entering the inlet air in the aluminium tube.
I don't know where those exhaust gasses comes from (waste gate? environmental feed of exhaust gasses back into inlet? Sump breather?)

Any ideas what the cause of this is?

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Old Oct 11th, 2017, 23:43   #2
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It's from the EGR or possibly leaking turbo seals.
I've no idea how that compares with a perfectly running engine though as people don't really open that up.

What running issues are you having?
Any live data?
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Old Oct 11th, 2017, 23:47   #3
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Evening there The deposits are caused by the engine drawing partially burnt exhaust into the inlet manifold via the exhaust gas recirculating valve ( EGR ) .

It is not a fault ( as such ) but a stupid idea aimed at cleaning up exhaust emissions ( not a bad idea ) . On engines driven slowly & on short journeys the effects are far worse , literally cutting off air flow due the gunk build up in the inlet ports .

Careful cleaning to remove the mess without scratching the metal below is easily done & pays huge dividends
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Old Oct 13th, 2017, 14:01   #4
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+1 ^^^^^ what he said.

Strip it, clean it, reassemble and it will probably feel a different car. The looks normal to me for a car with that mileage. The deposits are a combination of oil leaking past the turbo seals and soot from the EGR system - again completely normal.
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Old Aug 21st, 2018, 22:15   #5
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Quote:
Originally Posted by dingov70 View Post
Evening there The deposits are caused by the engine drawing partially burnt exhaust into the inlet manifold via the exhaust gas recirculating valve ( EGR ) .

It is not a fault ( as such ) but a stupid idea aimed at cleaning up exhaust emissions ( not a bad idea ) . On engines driven slowly & on short journeys the effects are far worse , literally cutting off air flow due the gunk build up in the inlet ports .

Careful cleaning to remove the mess without scratching the metal below is easily done & pays huge dividends

Just what I’m doing now.. what’s the best way to clean this!

I’m worried I’ve got car. Cleaner in there a bit. So trying to carefully scrape out anything that looks damp in case it’s got carb cleaner in. As worried there’ll be a big old knock when I fire it up

Is there a way of cleaning out people?
What about bits that drop down? Will they burn off?
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Old Aug 21st, 2018, 23:24   #6
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Vaccum it out if the wife will let you
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Old Aug 22nd, 2018, 01:04   #7
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Is there a way of cleaning out people?...

Well, colonic is one...

Worry more about ensuring there is no loose matter hanging around to get in places you dont want it. Carb cleaner evaporates fast, and the amount released from saturated deposits will barely affect anything. Squirt it into intake then try and start, you might get a reaction, but damp deposits arent a real concern.
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Old Aug 23rd, 2018, 21:55   #8
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I used a Liqui Molly cleaner on my Saab and it worked a treat, it consists of a long straw like tube attached to an aerosol, which is fed into the manifold whilst the engine is running...
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