Oil In Air Intake System

[RichTD]

C5 2003 110 HDI

 

I managed to find a good Lexia system on ebay and have resolved many (not all) issues.

 

Main problem is turbo boost pressure issues, when the engine is cold the turbo pressure can be so high as to cause the infamous "anti polution fault" However when hot the pressure is consistently low. While inspecting the pipes and intercooler for leaks I found oil in the air pipes coming from the turbo to the intercooler and from the intercooler to the manifold.

 

There is no oil cooler associated with the intercooler as I think there are are on some versions.

 

I suspect the oil is coming from the seals inside the turbo, and hence a new turbo will be needed.

 

Please can anyone help..... Please......

 

Thanks.

 

Richard

[kfk]

it isnt unusual to have oil residue within the intake system and it doesnt always mean there is a problem.

 

 

Oil coming from the turbo would have to come from the sump, which would mean the vehicle would experience an oil consumption problem.........does it use much oil?

 

 

acceptable oil consumption limits would be upto 1 litre every 1000 miles

 

Before you splash out on replacing things that may not be required, remove pipe work and clean out oil residue, check out oil consumption and then inspect pipe work to see if residue has returned.

 

 

If the oil consumption is good leave well alone

[RichTD]

Given that the turbo pressure is good when the engine is cold and low when it is up to temp might not infer that the turbo is on it's last legs, given a mileage of 143000?

[kfk]

I wouldnt really use mileage as reason to suspect immenant turbo failure.......if it has had regular oil changes with good quality oil there shouldnt be a problem.

 

Something i would do is remove the various small bore black pipes that control the vacuum side and where the 'T' sections are run a very small drill bit down them (rolled between thumb and forefinger)...to make sure there is no fluff or dust restricting the volume of air movement. Just blowing down the pipes doesnt loosen any restrictions that may have built up over time.

[RichTD]

Many thanks for your expert advice, I will try that in the morning.

 

Richard