If you've seen my other threads then you know this car has been the most needy prelude on the planet. Okay but it was time for smog and I thought it would pass no problem I was wrong. I've replaced the cat, 02 sensor, Pcv, air filter, fuel filter, oil change, ngk wires and plugs... I've cleaned the egr valve and throttle... Ive also done other thing that don't think involve smog but just in case I've replaced all gaskets intake exhaust head gasket, also changed valve seals and piston rings... Also all timing belt stuff. I run 87 or 91 octane. Everything is completely stock except a Megan racing muffler...

Like the title says I failed smog both 15mph and 25 I both hc and co. No was fine. I spent hours reading and now I assume I'm running rich but I can't figure how to stop it no smoke at all ever I have an H23 non vtec.

Sorry for the long story. Thank in advance I hope someone can help. I'd rather not pay a shop. Oh and it's auto.

if everything is new there, did you use oem or replacement parts?

you should clean iacv and injectors also

then check your valves and ignition (and adjust them if necessary)

how often you change you oil?

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Honda Prelude 1997 2.2 VTI

...meanwhile in Finland http://www.preludezone.com/members-r...7-2-2-vti.html

Thanks for the response all the stuff was oem quality I didn't actually buy the stuff at Honda. I've replaced the iacv and cleaned it. I recently swapped the map sensor but I didn't notice anything difference while running. Should I just dump something into the tank to clean the injectors?

I'll do a valve adjustment in the morning since I didn't do it after I replaced the rings

And I've owned the car 4-5 months about 2 of those month the car wasn't working and it had a crazy oil leak so it always had fresh oil in it but the filter is about 5 months old.

Id take the injectors off and send them to ultrasonic wash. of course theres ways to do in in your garage by yourself but atleast I dont trust in those methods (or myself) that Id do that to my OWN injectors.

get new injector seals as well if youre doing this

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Honda Prelude 1997 2.2 VTI

...meanwhile in Finland http://www.preludezone.com/members-r...7-2-2-vti.html

Leave California.. j/k

Try raising the idle a bit. How new/old is your catalytic converter?

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God's Not Dead

This.

How would the idle help? It sits at normal idle at around 700-800 I think the car is running hotter than a regular car if that makes sense...

And the cat is about 4 months old.

I think timing is advanced I still haven't gotten my hands on a timing light.

Just to update.

So last night I did a coolant flush and I changed the coolant temp sensor because my car was overheating and my fans would turn on late I also dumped an additive into my tank to clean my injectors. But today when I drove to work everything ran pretty normal but I'm the way home my acceleration was horrible I'm starting to think that the cat is clogged.

What do you guys think?

check distributor cap and rotor
check timing

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Honda Prelude 1997 2.2 VTI

...meanwhile in Finland http://www.preludezone.com/members-r...7-2-2-vti.html

high Hc means you have a misfire or running too rich egr doesnt help on this case. on high CO it means that you have an incomplete combustion. most likely all this problems cause by faulty sensors or faulty ignition system it also can cause high HC. Most people think that having a high Hc means bad cat but its not really the cat and yes cat can reduce the Hc but only at 30 to 40% if its on the right temperature.

first you need to check your ignition timing and distributor cap and rotors but most likely i think your ignition timing is late timing because you said when accelerating is bad. also check your cat get a infrared temp reader inlet on your cat it should read 250 to 350 degrees and outlet on your cat should read 450 to 650 degrees.if the outlet is reading low it means your cat is not working properly. BTW did you check if your cat is CA certified because if its not then get a CA certified cat. i know some sells non Ca certified cats.
i have a link on how to check for high CO and to check your cat hope this helps.




What causes high CO. What causes high Carbon Monoxide - SmogTips.com. Failed CO Emissions. Why did my car fail the emission test for high CO emissions. What is CO. My vehicle failed the emission test for high Carbon Monoxides. Why my car produced hig

So you guys were right about the timing I figured it out to late my si ended up leaving me on the road it was crazy I lost all power car died and wouldn't start. The rotor in the distributor broke off it was crazy but I replaced it and redid timing and it seems to be running great. I'm going back to see if I can figure out why it won't pass smog and I'll keep everyone posted. Thanks again for the replies