Why is this unplugged?

[Neil]

Good morning 

Not a lot of time for the Subaru this last 18 month or so😪, but was poking about the other day and found this and was wondering if anyone could shed light on why its disconnected. 

Thanks Neil 

[Neil]

Anyone?

I'm guessing it was done when new ECU was fitted 

[savage bulldogs]

Sorry bud , didn't spot this post 1st time.

That's a barometric sensor , used to measure atmospheric air pressure,  so the ECU knows the density of the air coming into the engine to adjust fuelling. 

What type is the "new ecu" ?

As most mappers tend to still leave that sensor connected to help with fuel trims 

[Neil]

Thanks savage 

I've got alkatec running mafless with added air temp sensor in the inlet 

[savage bulldogs]

Having a aftermarket ait is probably why it's unplugged , as the ECU is able to read the air temperature . Not quite as good as having the atmospheric pressure as well but a ait does help with maf less fuel trims 

[Neil]

Thanks I feel a bit better about it now