well, i failed emissions again (probably 7th time). here are my readings, in missouri:

HC: 0.8000 1.3196 grams/mile (fail)
CO: 15.000 7.5370 (pass)
NOX: 2.0000 2.3433 (fail)

my dohc zc is completely stock except for exhaust. i replace oil, oil filter, spark plugs, wires. anybody have any suggestions besides replace the cat? i put that "guaranteed to pass" emissions stuff already. i push the car on the highway before every run.

 

Yeah FULLY advance the ignition timing....that cleans the Nox up quite a bit. Do it in the parking lot before you go in, and leave in running in line so it stays hot. Your CO was really low, so your o2 sensor is fine.....try that, get back to me.

 

I passed with mine friday..

regular tune up tune down fuel pressure and retarded my timing....passed great...even with chipped ecu...

I'd do that bro....get it really hot on the way there....stay above 5k if you can for short periods of time...rev it in line...don't let it idle too long.....

-jose

 

god i just love the fact that florida does not have emmisions.. so we never have this problum at all

 

whats that have to do with it HELP??

He does not live in Florida!!, this thats like me saying "thank god I don't live in cali..."

 

btw, here's some more info on the graph charts

HC: high when the accelerate the car and raise the vehicle speed.
NOx: high when vehicle speed is between 30-60mph

 

Which ECU are you running? On my last smog test, I failed because I totally forgot I had the ZC ecu in my crx (ZC engine also). I just put my old Si ecu back in and passed w/ flying colors.

hth

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ef ***** &raquo;</TD></TR><TR><TD CLASS="quote">Yeah FULLY advance the ignition timing....</TD></TR></TABLE>

Backwards.... fully retard the timing. This helped Raene pass.

 

i have a 89 teg ecu.

i think i might retard the timing, lower the fuel pressure, and then put in 87 octane.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FOBsquad &raquo;</TD></TR><TR><TD CLASS="quote">i have a 89 teg ecu.

i think i might retard the timing, lower the fuel pressure, and then put in 87 octane. </TD></TR></TABLE>

Uhh doesn't high octane burn cleaner than low?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FourthGenHatch &raquo;</TD></TR><TR><TD CLASS="quote">Uhh doesn't high octane burn cleaner than low?</TD></TR></TABLE>

From what I've understood the octane rating has nothing to do with how it burns, octane by definaition is the ability to resist knock (detonation/pre-ignition) I think the quality of the gas, brand/age etc would affect how it burns more. But I dunno, it would make sense that higher oct would burn better, I've just never heard a confirmation from a reliable source either way.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blah13 &raquo;</TD></TR><TR><TD CLASS="quote">

From what I've understood the octane rating has nothing to do with how it burns, octane by definaition is the ability to resist knock (detonation/pre-ignition) I think the quality of the gas, brand/age etc would affect how it burns more. But I dunno, it would make sense that higher oct would burn better, I've just never heard a confirmation from a reliable source either way.</TD></TR></TABLE>

I always heard to run high octane before you take emissions.

 

High octane (93) is actually harder to get to explode, the mixture actually burns at a higher temp than 87 or 90 thus making it burn "harder" cleaning the engine, and creating a better overall combustion.