IGA News

Autodata Technical Issue 10 - Air filter soaked with engine oil in 2003 Ford Streetka

Autodata Technical Issue 10 - Air filter soaked with engine oil in 2003 Ford Streetka

30 November 2017

Each month the Autodata team answers a common technical question and provides a printable document with technical diagrams to download and keep, exclusively for IGA members. This issue finds the cause of a Ford Streetka’s air filter repeatedly becoming soaked with engine oil.

Q. A customer’s 2003 Ford Streetka 1,6 is burning engine oil resulting in blue smoke from the exhaust. The air filter was soaked with engine oil so we suspected a mechanical fault with the engine. However all of the normal mechanical checks don’t point to a major component failure. Having found no mechanical fault with the engine we replaced the air filter and returned the car to the customer. It has now been returned to us and the air filter is soaked with engine oil again. Is this a known problem?

A. Yes, this problem has been brought to our attention before. The engine oil return opening in the cylinder head cover is too small, allowing oil to be drawn into the air filter housing.


Disconnect the crankcase ventilation hose (Fig 1.1) from the cylinder head cover and enlarge the engine oil return opening to 8mm (Fig 1.2). Ensure no metal swarf enters the engine. Refit the crankcase ventilation filter for engine oil contamination and replace if necessary. Clean the air filter housing and fit a new air filter. This should cure the problem.

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