HELP: Why am I having a hard time passing emissions

[1Byounkin]

I haven't changed the air temp yet. I've checked it before and it seemed working. Haven't tried it at the computer.

With two cans of seafoam, white smoking though a vacuum line. I still fail with high hc. Up to 400 hc this time.

I can only fail one more time. Or move to another area or sale the truck.

 

[cgbier]

It might be a shoot in the dark (but it helped me to pass emission once): Have you ever tried Premium gas?

 

[1Byounkin]

I did that on the first test. Still failed.

I've been told about the alcohol thing. Using a gal of it to two gallons of gas.

I have a guy I'm going to take it to in the morning that says he can get it to pass.

 

[1Byounkin]

FINALLY GOT IT TO PASS!!!! Parently there was too much carbon on the back of the butterfly plus the PCV valve was stuck, causing extra air.

Passed with 56 HC > Limit 220 HC

Thanks for everybody's input!!!

 

[cgbier]

Wow! Congratulations!

But a stupid question: what is a butterfly?
(non-native English speaker)

 

[1Byounkin]

Thanks!
It's in the throttle body. The butterfly controls the airflow. Just take the intake hose off and you'll see a brass disc. Thus called a butterfly. Every engine has one or more.

 

[cgbier]

D'uh! Ok, thank you.

 

[Tbars4]

..Glad to see you stuck with it and got it fixed..Congrats...:biggthump