Emission help!

[Tobal]

Hey guys, just got my nsx, need help with smog. Car seems to idle roughly after idle. My HC level is tremendous at idle a major polluter. I tried heating up the engine too but still no good. All i have is just a DC sport exhaust system. What can be wrong? It seems like the rough idle might be a reason for why the car isn't passing. Any help will help. The mechanics are all having a headache on it.

 

[scott]

Originally posted by Tobal:
Hey guys, just got my nsx, need help with smog. Car seems to idle roughly after idle. My HC level is tremendous at idle a major polluter. I tried heating up the engine too but still no good. All i have is just a DC sport exhaust system. What can be wrong? It seems like the rough idle might be a reason for why the car isn't passing. Any help will help. The mechanics are all having a headache on it.

 

[scott]

It seems like all of us with DC sport headers have emisions problems?

Anyway, I had some high HC levels. I ran a bottle of the garantee to pass fuel cleaner, changed my spark plugs and ran 104/108 octane booster during the test. I got the cats real hot and got it to pass.

You may also want to check your O2 sensors. They should bounce between full rich and full lean which is .2V to .7V if I remember correctly?

 

[Tobal]

I don't think i have the DC Sport header, but i know i do have the catback. I don't think that the catback exhaust system will have the great effect. But the car seems to be Misfiring at idle. This very frustrating espcially when i dont' know what is contributing to it. Is there any way you can diagnose it. I just changed all 6 plugs and just got a perfect compression check. They also checked the coils and checked out ok. What else can i look for? THanks guys

* I wonder if i can get this diagnosed free at a local dealer....