HC- emissions test failed - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 11-17-2008, 09:23 PM Thread Starter
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Date registered: Jun 2008
Vehicle: 124--- 1991 300 CE
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HC- emissions test failed

Hey everyone--

My emissions test failed. I have a high HC at the 25 mph test. ( I thought that it was the nox in my last post --- my bad) The HC was 205. I need it to be 184. Does anyone know if I add denatured alcohol to the tank and then drive it for about 30 min and then take it to have it re tested. Will the HC pass? Will it lower the HC?

Should I change the oil? Some of you mentioned it would help.

What would it do if I changed the spark plugs. My mechanic changed them a while back and said they would last until my mileage was around 170,000. My car has around 132,000 right now.

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post #2 of 2 (permalink) Old 11-20-2008, 02:05 AM
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How about change engine oil, air filter, tune up and clean if not change your spark plugs!
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