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February 25, 2022
Case: Some time ago, I took over a Skoda Haorui with a displacement of 2.0T (the EA888 used by Volkswagen's 1.8T and 2.0T). The customer responded that the oil consumption was serious, and one liter of oil had to be replenished for 1,000 kilometers.
After picking up the car, I checked the car and found that the front and rear oil seals of the crankshaft, the turbocharger and the valve cover have no obvious traces of oil leakage! Based on previous experience and the analysis of the principle of forced ventilation of the crankcase, it is suspected that the oil and gas separation inside the forced ventilation valve of the crankcase is not good, resulting in the unseparated oil vapor directly entering the intake manifold and burning. Sure enough, as soon as the pipe on the crankcase forced ventilation valve was pulled out, the oil dripped straight out. The intake hose at the throttle is also full of oil.
So I removed the place indicated in the picture, blocked it with rubber, and then tested the car. It was found that the idling tachometer would quickly drop to the 800 rpm position. The problem was found. The crankcase forced ventilation valve was stuck when idling!
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