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.
|chatter , noise , tap , tapping , valve|
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