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Re: XJ40: Fuel Inlet Valve Knock
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Re: XJ40: Fuel Inlet Valve Knock



>kind enough to mention what was causing a quiet knock at idle from the 
>fuel rail, but I'm not sure what it was again.  I think it was the fuel 
>inlet valve and hose, and a "green olive" at the bottom.  Is this 
>right, any idea on prices?  

The fuel inlet hose, pipe to fuel rail, and it's accompanying viton
seal, the green olive. The old part numbers are CBC2581 and CBC4720.
I'm pretty sure there have been updates to the hose.



>     Also, besides a knock (kind of like a muffled helicopter noise) 
>from the rail when the car is warmed up and idle, does this faulty 
>valve effect the car any other way?  the car doesn't have a 
>ultra-smooth idle, can this piece cause a slightly rough idle when it 
>goes bad, or does it just make an annoying noise I hear when the radio 
>is off?
>
The noise is injector induced pressure pulses in the hard fuel line
running under the forward cabin. The failure is the pressure damper built 
in to the hose. It's not that it creates a noise when it fails, rather it
quits dampening out the noise when it fails. No other symptoms or problems.
The rough idle is a seperate issue, and should be addressed. The XJ40
engine management system is sophisticated enough that it can cover/mask
a lot of problems. These engines can run quite smoothly with some pretty
drastic problems. Blown out intake gaskets are common. 




>Thanks in advance for any info!


   Randy K. Wilson
     randy@taylor.infi.net

References:

 

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