slight burning smell
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Ok Guys. This is going to sound crazy & no, I'm not crazy...I had the same problem and it turned out to be a fender liner that had come loose and when driving was being pushed back against the wheel rubbing a nice hole in the liner. Chances are though it's something else. Could be one of the idler pulleys for the serpentine belt is starting to sieze up, creating some friction.....? You're welcome for the laughs.
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After looking under the hood, it does look like the smell is coming from the driver's side valve cover. Looks like some oil is getting on there and dripping down. The fix is another question. I first think of an EGR valve of some sort, but does the XJR have an EGR? If not is this just a matter of replacing the valve cover gasket?
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If the covers have not been removed before replacing the gaskets should fix it. If they have been off add a check for cracks in the plastic valve covers. Tightening beyond the torque specs will only crack the plastic, not stop a leak.
Remember the FelPro gasket set for the Lincoln LS is half of any source of Jaguar branded parts.
Remember the FelPro gasket set for the Lincoln LS is half of any source of Jaguar branded parts.
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The burning smell can be brought on by many things and oil leaking from the valve covers is one of them. If you have a leak and you elect to do the job you should know that torque is an important part of the process as Tom has indicated along with checking the valve cover for cracks. When reinstalling be sure that both surfaces are clean and dry. When torquing do it in the proper sequence, as silly as it may sound it is important. You do not want it to leak again.
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