#1
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98 Pathfinder failed smog, high HC
My 98 Pathfinder just failed the smog test with high hydrocarbons (HC).
Is this a sign of unburnt fuel? Will new plugs help? Thanks |
#2
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Yes it means unburn fuel so inspect your plugs, plug wires for weak spark. Also vacuum lines for leaks.....spray connections with carb cleaner to detect leaks. If there's no MIL makes it difficult as there are a hosts of possible causes including leaky injectors, rich condition could mean failed/failing O2 sensors. Hope this helps.
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#3
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I checked the timing, and it was about 12°. So I set it to the factory recommended 15° BTDC.
Could this have accounted for high HC? |
#4
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Its possible. Here's a link that makes interesting reading in understanding emission gases.
http://www.autoshop101.com/forms/h56.pdf |
#5
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A mechanic told me that usually when the NOx and COx emissions are nominal, coupled with high HC, that usually means a bad catalytic converter.
Is this reasonable? I assume my V6 has two catalytic converters, how much should I expect to pay for that? |
#6
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Based on your symptoms I won't be so quick to condemn the CAT hence you would have P0420 code. And causes for excessive HC do not list a failed CAT though possible. But you are free to replace your CAT. Look for Bosal, Walker, or Eastern Catalytics at Amazon, Ebay, rockauto.com, or apw.com. Have fun.
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failed, high, pathfinder, smog |
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