High knocks on a smog test 2.4 nissan frontier


Old 07-18-11, 05:08 PM
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Join Date: Jul 2011
Location: usa
Posts: 3
High knocks on a smog test 2.4 nissan frontier

I have changed everything you can imagine and still have a p0304 code and high knocks just ordered a new knock sensor so waiting for it to see if it helps,just tired of trying!
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Old 07-18-11, 07:28 PM
Join Date: Feb 2009
Location: USA
Posts: 323
Are you referring to knocks or Nox?

For an emissions test, high Nox which is oxides of nitrogen, are generaly from very high exhaust temperatures and generally correlate to a faulty egr valve.

To check the egr valve, push up under the valve and press the diaphragm up then cover the end of tube with your finger and see if it falls down. If it stays up then most likely it's good and you need to chase a vacuum problem.

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