Just replaced my PCV a few days ago along with the smooth breather hose to the ribbed version. The car has more power then I it has had in awhile. I never would have guessed how a gummed up pcv could actually rob performance but it was. Anyone who has not done so I highly recommend the quick change out. I am looking forward to seeing if the fuel economy increases as well.

 

Pics of the hose? How did you know it was bad?

 

Mr rx, first off, if you have a smooth PCV hose, it is a ticking time bomb. You will know that it is failed by disconnecting the one end and looking at the underside of the hose. Normally in the spot where it goes over a support bracket, the hose will develop a split in it running the length of the hose. When this is going, you will start getting vacuum leak codes (P0171 or P0174) and in extreme situations, you will be put into safe mode where you cannot rev the engine up beyond 3,000 RPM.

 

Added a few shots of what I found. Very glad I did the replacements. The Jag OEM parts were cheap and it took maybe 15 minutes from start to finish



60k miles on this PCV





This is what I saw when I took of the original smooth breather hose





Luckily very clean in there