See

http://www.interro.com/techgas.html#anchoreleven ,
especially "Causes of Excess Emissions." The section on high
CO blames the engine control system. The section on high HCs
points to fouled plugs and/or old ignition wires.

www.interro.com/techgas.html#anchoreleven

Per the above sites and what they say about high CO and HCs,
I would start by replacing the PCV valve, spark plugs, and
wires.

You say you do not want to spend a lot of cash, but it sure
sounds like your poor ol' Honda would benefit a lot from a
tuneup. For one thing, your fuel mileage might increase a
lot. For another, the life of other, more expensive ignition
system parts can increase. Strongly consider performing all
of what's listed at
http://home.earthlink.net/~honda.lioness/id11.html .

"Aaron" > wrote
> took it to get smoged from my annual 2 year check and it
> failed....
> the emission control systems all passed but the idle
> emission test
> didn't oh by the way this is for a california smog
> At Idle HC: Max 120 Me 204
> CO: Max 1.00 Me 1.88
> At 2500rpm HC: Max 150 Me 77
> CO: Max 1.20 Me 1.73
>
> Yeah so i have no idea what could be the cause any ideas?
> i'v heard
> check air filter, fuel filter, spark plugs but i'm trying
> not to spend
> a lot of cash on this... Suggestion?
>