Hey all, sorry I am new to this and not sure what to post where. I have recently purchased a 2004 XJ8 with the 4.2 and my crankcase vent valve is really loud, almost whistling. Its not thrown any codes, but I have ordered one because they are really easy to replace and I figured it was worth a ****. I've already taken it off and plugged one side and blew thru the other and air was coming out of somewhere. None of the hoses were bad on that side or the part load breather tube. So i guess my question is: If i plugged one side of the CCV and blew thru the other should air be coming out? Is that why it could be hissing loud? I took off my oil cap while running and it got really lous and stalled. I started it and put my hand over where the oil cap goes and it was still hissing. Do these go bad? It was real easy to blow thru without plugging it too btw. Any help would be greatly appreciated. Thanks in advance and I apologize if im posting in the wrong thread

 

Welcome to the forum RKRG,

I've moved your post from the end of a thread in XK8/XKR section to its own thread here in the X350 section.

When you get a minute, please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST section and post an introduction about yourself and your XJ8 for all the members.

In return you'll get a proper welcome and some good advice on finding your way around the forum.

Hope the guys here can answer your tech question.

Graham

 

An engine running normally should not have pressure in the crankcase, so you could have combustion chamber pressure coming past the piston rings or somewhere. What miles on the car ? Does everything else seem OK ?

 

Everything seemed fine until yesterday. I lost all kinds of horsepower. top end was fine, but taking off was a struggle. seemed restricted and of course the CCV was whistling pretty loud. I'm not blowing smoke or anything though. I appreciate you guys helping me out here. I did drop it off at the Jag dealer last night. Will post an update when I know something

 

oh and sorry, its 104,000

 

I hope it something minor Richie. Where you located, its not in your profile? Somewhere in Kentucky perhaps? (I'm part psychic)

 

So what was the result of your dealer trip?

John

 

Where does one purchase an aftermarket CVV?

 

I have the same problem! What was the answer?