Question about 2002 Jaguar X-Type

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Very light knock when idling that goes away when engine revs up

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I would first run a check on oil pressure with a gauge known to be good. That will show up a worn or spun big end or main bearing. Pressure will be low.
If that was OK, I'd suspect a failed small end (gudgeon pin) bearing in a piston.
It may also be pre-ignition due to bad timing or low-octane petrol. That sound is more of a rattle like a handful of pins being dropped.
Tappet adjustment may be the cause, but that is more of a clicking sound.
I have seen it reported that the A/C compressor in Jags can make this noise, so check it with A/C on and off.

Posted on Oct 17, 2013

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