my hydrocarbons @ idle were 236 ppm and the max is 220 ppm.

everything else passed easily.

is there anything i can do w/o having to mess with my exhaust.

95 gsr i/h/e---test pipe.

i would put on my stock cat, but i cant seem to find it. i think an ex-friend borrowed it a couple of years ago and he is long gone.

i just dont want to spend the money on a new cat...

i know i'm a jackass for my test pipe. i put it on 3 years ago and wish i wouldnt have...

 

Buy a used cat.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by acuracing &raquo;</TD></TR><TR><TD CLASS="quote">Buy a used cat.</TD></TR></TABLE>

i knew that was coming.

 

buy a new cat!
-even better, be a hard *** and say no to new tabs

 

timing will also effect HCs try retarding ur timing before testing also if the converter is firing that will cause high levels

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by acuracing &raquo;</TD></TR><TR><TD CLASS="quote">Buy a used cat.</TD></TR></TABLE>

what he said...you MIGHT be able to find a used one at a local muffler shop...ask around...good luck

 

emissions failure.... no, you mean life failure.

 

HC's are essentially unburned fuel. Unburned fuel can come from rich a/f mixtures, evaporating fuel or improper ignition timing.

Retarding the ignition timing would basically allow LESS time for the fuel to burn...so advancing the timing should help out with HC #'s.

Leaning the a/f ratio out would also help with the #'s.

Get a catalytic converter, pronto.

 

even if you are driving w/ straight pipe all the way through??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by svtec &raquo;</TD></TR><TR><TD CLASS="quote">my hydrocarbons @ idle were 236 ppm and the max is 220 ppm.

everything else passed easily.

is there anything i can do w/o having to mess with my exhaust.

95 gsr i/h/e---test pipe.

i would put on my stock cat, but i cant seem to find it. i think an ex-friend borrowed it a couple of years ago and he is long gone.

i just dont want to spend the money on a new cat...

i know i'm a jackass for my test pipe. i put it on 3 years ago and wish i wouldnt have...</TD></TR></TABLE>

high HC indicates a misfire like unburn fuel going down the exhaust. if you have a reall low o2 this will confirm a misfire at idle. a rich condition will also cause this; but, it will rise your co readings as well and lower your co2 reading. i would start to look at your spark plugs, cap, and ignition rotor for problems. most likely it's your plugs. 80% of fail HC honda and toyota's I get are because of plugs or customer just did not warmed up vehicle long enough.