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Hi all, recently failed smog test. Failed on high HC at 15 mph. See screenshot for smog test results. Any advice as to why it failed would be appreciated. Before test , oil was changed and spark plugs replaced. Drove car about an hour before test. Thanks, Jim
1993 Honda Accord EX, 298,000 MILES.
P.S, having trouble attaching results, will keep trying, until then:
HC: MAX:61 AVE:28 MEAS:75 AT 15MPH FAILED
HC: MAX:36 AVE:17 MEAS:36 AT 25MPH PASS
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Here are some things to check.
Awesome you got 300K on your accord.
Anyway it appears that you are running rich at low speed. You should really get a scan tool to look at live data. Look at your fuel trims and go from there. There are a lot of videos on youtube about fuel trim. I haven’t seen the one by “schrodingers box” but I’m sure it’s a good one.
With that many miles, it’s possible it’s burning oil. You might do a compression test for starters, especially if the engine consumes oil.
Honda’s are super sensitive about the parts you use. Make sure you used either NGK or Nippon Denso plugs. More info on this here.
http://www.ericthecarguy.com/faq/solving-automotive-performance-issues
Please keep us updated on what you find.
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