NA IAC plumbing (or lack thereof)
#1
Elite Member
Thread Starter
iTrader: (17)
Join Date: Aug 2007
Location: Knoxville, TN
Posts: 2,949
Total Cats: 183
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Using a map sensor, is it necessary to plumb in the IAC valve into the charge piping on a 1.8 NA or can you just throw a breather filter on it? In the past I've always had it plumbed in, but with my current car it's open. Will it create a boost leak or does it seal once the car is off idle?
#4
Boost Czar
![](/mt2011/images_td/ranks/supporter1.gif)
![](/mt2011/images_td/ranks/admin.png)
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,688
Total Cats: 4,113
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I ran mine open with a breather filter (naturally aspirated), and it sounded like **** and the idle didn't work as well as it used to. Car ran fine otherwise. When going FI, I re-plumbed it back into the intake because I thought it might leak backwards in boost.
So maybe?
So maybe?
there's no reason it can't be open to air, if it leaks in boost (which it shouldn't), install a check valve.
#5
Elite Member
Thread Starter
iTrader: (17)
Join Date: Aug 2007
Location: Knoxville, TN
Posts: 2,949
Total Cats: 183
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Thanks for the help guys. Never even thought about a check valve, that seems like the simplest option. I really wish there was an idiot proof way to get an NB throttle body to work, but I couldn't ever get the TPS working right.
Thread
Thread Starter
Forum
Replies
Last Post
mikeflys1
Miata parts for sale/trade
15
10-27-2018 02:19 PM
elesjuan
Build Threads
7
11-03-2015 01:51 PM