XJpax
NAXJA Forum User
- Location
- Northern Maine
For about the last month or so, occasionally on startup - appx 1/3 of the time - my engine will have a knock that corresponds with the revs. It is pretty audible, and people I pass in my neighborhood will look at me because they hear it too. Sometimes it'll go away after 3 seconds, sometimes 30, sometimes 3 minutes, and a few times, it has continued for 13+ miles. I have 137k on it (2000 XJ), my oil levels are good and fresh.
It may only be a coincidence, but if it goes on for more than a minute, if I pullover and shut it off, and re-start it, it seems to disappear quickly after re-startup.
It certainly sounds like it is coming from the top-end, perhaps the valves or a valve or a broken tappet spring or something.
I added Lucas oil conditioner to it to try and thicken it up, and that seemed to help slightly. Recently I noticed it was low on coolant, so I topped off on that, and I swear that helped to.
Again, these minor "helps" could only be in my head.
Any solid thoughts anyone?
It may only be a coincidence, but if it goes on for more than a minute, if I pullover and shut it off, and re-start it, it seems to disappear quickly after re-startup.
It certainly sounds like it is coming from the top-end, perhaps the valves or a valve or a broken tappet spring or something.
I added Lucas oil conditioner to it to try and thicken it up, and that seemed to help slightly. Recently I noticed it was low on coolant, so I topped off on that, and I swear that helped to.
Again, these minor "helps" could only be in my head.
Any solid thoughts anyone?