Smooth air intake coupler question
Thread Starter
Melting Slicks
Joined: Oct 2003
Posts: 3,040
Likes: 47
From: El Dorado Hills CA
Smooth air intake coupler question
Good day everyone. I purchased a smooth intake coupler and I just noticed that my OEM accordian coupler has a a small ose connected to it. Any idea what I am suppose to do with that because my coupler doesn't have that hole. The hole is about 1/4" in diameter. Any input would help.
Thanks.
Thanks.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
97-98 c5 used the coupling area to reference intake vacuum for fuel pressure regulator vacuum reference. You can "T" off the PCV vacuum port for the fuel pressure regulator vacuum reference which (in theory should help lean out the engine and improve performance)... I did this on my 98 and it helped performance a little bit by leaning out the fuel charge. ECKLERS sells a kit to do this and all it is is a "T" fitting whitch switches fuel pressure vacuum reference to the PCV references area to the PCV port vise the accordin tube port.
C5 are by GM spec,, designed to be a little bit RICH.. If you change the fuel pressure ref araa to the PCV port, it is suppost to help correct this issue.
BC
C5 are by GM spec,, designed to be a little bit RICH.. If you change the fuel pressure ref araa to the PCV port, it is suppost to help correct this issue.
BC
Le Mans Master
Joined: Sep 2003
Posts: 6,275
Likes: 226
From: Farmington CT
Cruise-In VII Veteran
Originally Posted by Dave68
You will need to drill an identical hole in your smooth coupler. Starting in 2001, this holes was not included in the OEM coupler.
the hole you are referring to is the IAT(intake air temp) sensor that was moved to the MAF in 2001, this is located in the plastic 'bellows' that crosses the top of the rad/cond
