Hi, any advice please?
I have a 2001 xjr the engine is strong still pulls like a train uses no oil or fluids no smoke even on hard kick down in fact runs superb! However, when it's been stood for a day or more when I start it up there's a quiet knocking coming from the engine. This noise remains for about 60 seconds but gets quieter and quieter until it disappears entirely, almost as if it's taking too long for the oil to circulate? I have very little mechanical knowledge but I know this is the better steel lined engine so praying it's not a tensioners issue?

 

My money would be on the cam-chain tensioners, but it is difficult to diagnose without listening. What part of the engine is the noise coming from ? It could just be a bit of piston slap.

 

Tensioners

 

Welcome to the rexrich007,

I've moved your question from General Tech Help to X308 forum. Members here with the same model will be able to help.

Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some info about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.

Graham

 

Your tensioners are plastic body, but likely 2nd gen. which has a external spring to reduce the sound. There may be other issues, but that's the first problem to attack.

 

Check for split in EGR valve tube. It is a 6" stainless steel tube from exhaust manifold to EGR valve. Replacing this tube solved my problem. See my post regarding this subject. https://www.jaguarforums.com/forum/showthread.php?p=1123355#post1123355

 

You have been warned! If you are not sure you have metal tensioners, then it is foolish to drive that car any more until you get the ypgraded units in there. Many folks are not lucky enough to get a warning!

 

. . . then it is foolish to START that car any more until you get the upgraded units in there.

Another thing to look for is oil pressure. Even as worthless as the dash gauge is if it doesn't come to mid range in 2-3 seconds you probably have installed an oil filter without a check valve.

 

What dashboard gauge is that, exactly?

 

+1 on this.

A proper oil filter with a check valve would be the second thing I would check, right after the tensionsers.

But since you say it is a knock, not a rattle, I am guessing it is oil pressure related and a cheap oil filter without the proper anti-drain valve is probably the problem.

If you have a $5 "Fram" filter, take it off and throw in the nearest trash can and replace with a good one.

I use NAPA Gold filters, they are about $15 and they have all the proper parts.
Vector

 

There is no oil pressure gauge in a 2001 XJR. Only an "idiot light" that tells you when you have ruined your engine.
Vector