FCmaniac

I'm talking about the sensor that bolts to the bracket that holds up the dynamic chamber on S4 NA (BAC side). I think its the intake air temp sensor and connects to the metal pipe going back to the intake pipe (BAC is also connected to this pipe). Its one of the few things I kept after doing emissions elim. I thought the ECU needed this sensor along with MAF and O2 to determine fuel? If I don't need it, great.

1Revvin7

You're going to want to keep it, try running with it unplugged see how that works..

j9fd3s

it should run ok without it, but you really do want it in there. its the same one for all the fc's, mpv, etc. n326-18-845?



mike

FCmaniac

Ok, so Revvin, how do you guys have it hooked up on BigT's car? I don't see the tube in his pic but I can't tell.

pengaru

I have a sneaking suspicion you are talking about the AWS solenoid, not the IAT sensor.



If it has a tube going to it, it's either the BACV or the AWS, at least if the tube is used for the transmission of air and is anywhere near the throttle body.

FCmaniac

There is a long metal vacuum pipe that goes along back of DC next to BAC coolant line on S4 NA in stock form. This metal pipe connects to the underside of the rubber intake pipe and at the other end connects to the BACV and this sensor I'm talking about... I thought AWS was near the throttle body?

pengaru

There is a long metal vacuum pipe that goes along back of DC next to BAC coolant line on S4 NA in stock form. This metal pipe connects to the underside of the rubber intake pipe and at the other end connects to the BACV and this sensor I'm talking about... I thought AWS was near the throttle body? [/quote]

The thing you are referring to is the AWS. It's a drum looking thing that connects to the tube you refer too, it uses this tube as a source of air so it can make the idle high @ cold start. The BACV also uses this tube for an air source.



The thing on the throttle body related to accelerated warmup BS is the thermowax, which mechanically opens the throttle @ cold start until it's wax is melted, this is the thing that gets coolant flowing through it. It also doubles as a vacuum solenoid for the double throttle vacuum actuator so the double throttle is closed until the thermowax melts if I remember correctly.



99% sure you're talking about the AWS solenoid Thats the ****** responsible for the high idle you can disable by starting in gear, it's the only electronically controlled part of that high idle @ cold start system. Why they didn't just use a BACV that can meet the demands of all this stuff and eliminate all the redundant junk, I don't know.... yay mazda.

FCmaniac

So I can take out that nasty ****** metal tube? Where is the IATS then??

pengaru

see the green wire in your picture going to a small white connector, the little thing that plugs into is the IAT sensor, this of course depends on wether my memory serves me right or not. Actually, holdon imma go in the garage and double check on this engine we pulled.



yep, thats it. It's a two wires connector, one of the wires is that green one, it's nestled in there threaded into the drivers side face of the dynamic chamber.





You see the black hose coming down off the hard tube you're saying runs along the back of the dynamic chamber? That hose leads up to the AWS. You can remove it if you want, it might make starting in winter a bit difficult without assistance via pedal though.

pengaru

btw, nice clean engine bay