High HC--Failed emissions.
03-10-2008, 06:12 PM
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High HC--Failed emissions.
CO was normal. That means misfire and not a rich condition. Disconnecting injectors creates an RPM drop on each cylinder. Any thoughts?
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03-11-2008, 10:23 AM
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@ 440ppm something is causing a misfire.
Could be a mechanical problem with the engine, leaking valve, vacuum leak etc. But even more likely would be a partially plugged injector. I woud pull all the plugs and check the compression just to rule out a mechanical problem. If that is ok I would replace the plugs if they are worn and send the injectors out for a flow check and cleaning at a place like Dr. injector. Its not a cat issue, they are not designed to clean up HC in that high of an amount. 440ppm is really high. Since your CO% is ok I would suspect a problem with one cylinder.