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Rennix 2.5 rear plastic line (PCV?) has hole in it


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The PCV system ventilates the crankcase. The rear (small) line is the suction line. The larger line in the front allows (supposedly) filtered air to be drawn into the crankcase. The PCV valve (2.5L engine only, the 4.0L doesn't have one) is a one-way check valve.


Crankcase air is pulled out through the small line by vacuum in the intake manifold. The hydrocarbons in the mix are then burned in the combustion process. If you have a hole in the small tube, you have a vacuum leak. That makes your mixture run lean, which can fool the computer into injecting more fuel than is needed.

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