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Q: why Will my car not pass smog? on 1996 Acura TL

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the code P1491 pops up in the system. I replaced and even cleaned out the egr valve really good, reset the check engine light and it still will not pass smog. What can I do? The smog tech said that everything looks good in my emissions and my engine but that code still pops up. Now my check engine light is back on again.
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The egr ports inside your intake manifold are probably clogged, it may have to be removed to thoroughly cleaned. Or it may be a problem with the egr control solenoid.
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