Ok so here is the deal. I have failed smog due to high HC at idle only, everything else is passing fine. Question is what can be causing the excessive unburned fuel at idle? I have done the simple stuff to try to fix it but I have had no luck. So far I have replaced spark plugs, wires, cap and rotor, O2 sensor, cat. converter, egr has been checked and all sensors have been checked. I got to be missing something. Anyone that has had this problem or knows about this problem please help me out. I got to get this thing passed. TIA

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CentralCalLude92 &raquo;</TD></TR><TR><TD CLASS="quote">Ok so here is the deal. I have failed smog due to high HC at idle only, everything else is passing fine. Question is what can be causing the excessive unburned fuel at idle? I have done the simple stuff to try to fix it but I have had no luck. So far I have replaced spark plugs, wires, cap and rotor, O2 sensor, cat. converter, egr has been checked and all sensors have been checked. I got to be missing something. Anyone that has had this problem or knows about this problem please help me out. I got to get this thing passed. TIA </TD></TR></TABLE>

Can you post your results of all the gases when you did your smog test? That'll help everyone out and see where you're at w/ your prelude.

And btw, I find it hard to believe that your prelude underwent a 2-speed idle test. Are you sure you're not mistaken for doing the Accelerated Simulation Mode?

 

Here is the test results

 

anyone else?

 

Nobody has had smog issues?

 

have you had your injectors checked?

 

email me i can help you


cynar

pnoise20032msn.com

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rob97’SH &raquo;</TD></TR><TR><TD CLASS="quote">have you had your injectors checked? </TD></TR></TABLE>

No. And how do I check them?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sprinter2tg &raquo;</TD></TR><TR><TD CLASS="quote">email me i can help you


cynar

pnoise20032msn.com</TD></TR></TABLE>


That email is not working.

 

my bad

pnoise2003@msn.com

cynar

 

seafoam, injector cleaner, and dont turn ur car off when u get there, i failed ref' that way they made me sit out for 1 hour dam bastard's

 

heres my old tread about smog

https://honda-tech.com/zero...age=1

 

pull your injector rail and injectors and turn your key on to get pressure from the pump (don't crank the engine). Now this only works if you can keep your injectors tight in the rail. Get a fuel gauge to see if you loose pressure. The point of removing the injectors is to find which one is leaking. Or you can pick up a set of new injectors for a good price. Also check your fuel pressure regulator to make sure its keeping the right pressure.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rob97’SH &raquo;</TD></TR><TR><TD CLASS="quote">pull your injector rail and injectors and turn your key on to get pressure from the pump (don't crank the engine). Now this only works if you can keep your injectors tight in the rail. Get a fuel gauge to see if you loose pressure. The point of removing the injectors is to find which one is leaking. Or you can pick up a set of new injectors for a good price. Also check your fuel pressure regulator to make sure its keeping the right pressure. </TD></TR></TABLE>

Ok Ill check them out.

 

injectors checked out good.

any other suggestions?

 

your thermostat isnt stuck open is it?? if it is then ur overcooling the motor causing it to run rich

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95JDMprelude &raquo;</TD></TR><TR><TD CLASS="quote">your thermostat isnt stuck open is it?? if it is then ur overcooling the motor causing it to run rich</TD></TR></TABLE>


No. thermostat is pretty new and engine is running at proper operating temp.

 

can you afford a ecu tester? need to see you long term trim and short term trim or if you o2 is being lazy.

 

wel since u replaced all the secondary ignition then that cant b it...it could be worn intake cam lobes or worn exhaust cam lobes...or it may b a vacuum leak or and exhaust leak before the 02 sensor