Running too rich...

[matt38111]

Hey guys having a little trouble with my 94 z. For one I cant pass emissions cause of the hydrocarbons and co2 is to high. Also too I just put a cold air intake on today And it is taking in way to much air any suggestions on how I can make it run more lean?

[NolimitZ32]

Maintenance and tune is the only real solution.

[matt38111]

Well anything more specific because if tried eveuthing I can think of...

[NolimitZ32]

What maintenance have you done already? whats the car doing? are there any codes? are your cats in good condition. there are so many things to check you gotta narrow down what you have done so that we can point out what you haven't.

[Z31toZ32]

here is a little thing i found online: http://www.300zx-twinturbo.com/tech/co/co.html

[matt38111]

That seems like the thing to try I'll have to pull that vacuum hose. Ok I have no cats on my car. My egr valve is deleted so the code for the egr is flashing. I change my oil regularly and I use 5w-20 oil. I recently changed the spark plugs and I advanced the timing just a hair. Is there anyway I can adjust the air to fuel ratio?

[NolimitZ32]

To adjust AFRs you need an AFC or a Nistune. But I doubt that you'll be able to pass without cats unless you "know someone"

[matt38111]

It's weird though because I passed the year before.

[NolimitZ32]

Do they run the car on a dyno where you live? or just do a 2 stage idle test?

[matt38111]

They have the sniffer that reads it at idle