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Unread 05-19-2013, 05:01 PM   #1
aldersonfilm
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1998 TJ Wrangler 
 
Join Date: Jun 2012
Location: Pasadena, CA
Posts: 177
Valve noise

I know the 4.0s are noisy engines, but I've got some pretty significant valve chatter. It's a loud rhythmic tapping and sounds louder than my old XJ with the same engine. I also failed smog for NOx levels being too high, which means that it's burning too hot and lean, so the timing is almost certainly off. Anybody know where to start with this? O2 sensor is brand new.

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Unread 05-19-2013, 05:05 PM   #2
Reddy89
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1989 YJ Wrangler 
 
Join Date: Jun 2010
Location: , NJ
Posts: 343
Do you change the oil frequently?
Take a look at your plugs and see if they can give you a hint, also check for codes.
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Unread 05-19-2013, 05:34 PM   #3
aldersonfilm
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1998 TJ Wrangler 
 
Join Date: Jun 2012
Location: Pasadena, CA
Posts: 177
Oil is changed very regularly. It's a tad low, but frequently changed. Plugs are new too, but I'll see if there are any hints in that department. No codes. Just the normal 12, 33 and 55 codes.
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