got my truck smogged today for registration.. and if failed miserable..
scored a 3346 for HC at 2500rpm, and 3215 for HC at idle.. in order to pass its suposed to be under 220..

any ideas?

 

http://www.interro.com/techgas.html#anchorfour

 

great info.. thanks.. i thought i was having some misfire issues.. now im kind of sure..
im gonna take it into a shop on monday... thinking bout a new ignition wires and plugs anyway.. so this might be the straw that busts my wallets back..

 

Fresh oil change as well and make sure the engine is good and hot, drive 10-20 miles at speed (at least) before retesting. Check your O2 sensor or replace if it is old (I keep a brand new sensor just for smog tests).

Also consider adding 10% denatured alcohol to the gas tank. Adds O2 to the fuel, helps reduce HC/CO levels, also make sure your timing is fully advanced.

 

thanks for the tips...
how do i advance and retard timing correctly on a 3.0?

 

never mind.. i shoudl eb able to find that on my own..

 

You'll need a timing light to check and set the timing.