Egr Valve Cap
Apr/100
1994 honda accord that did not pass the emissions test. hydrocarbons are slighty high 0.85 gpm. Causes?
Replaced egr valve, ditributor assembly,cap,rotor wires and plugs.
on a vehicle this old the catalytic converter would be highly suspect, however there could also be dirty fuel injectors which leak excess fuel into the intake causing a "rich" condition, and there are other factors at play here. The bottom line is your hydrocarbons are high because of unburned fuel in the exhaust. this could be caused by a misfire. If you plug a scan tool into it and look at the o2 sensors, see if they are counting. Also make sure you don't have any exhaust leaks before the cat or the o2 sensors will report a "lean" condition to the computer which in turn will "richen-up" the mixture to compensate, causing the readings you are getting. You might consider having a professional tech look at it and pay his fee, than spend countless hours trying this and that till your sick of buying parts, could be cheaper in the long run. good luck!
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