Hey all,

Does your P400 idle above 1k in park with AC on?

Thank you

 

yes mine seems to up the idle a bit in the same conditions.

 

Mine’s a p300, did it to me as well. It might not be a bad thing in reality. Yes, use a little more fuel but probably helps the compressor when it’s hot outside to help keep you cool.

 

P400 here. Yes. When it's really hot. it seems to increase the idle a bit more than I was expecting it to. Notice it at the start of every summer!

 

Here’s a view of live data from my GapIId tool

PCM (powertrain control module)

Looks like the car can command an idle increase for a few reasons:

HVAC
Cooling (ie coolant temp)
Battery Charge Request (charge too low… ? Idk)
Catalyst (heat up the converter to reduce emissions)

Cool huh? It’s called IDLE JACK in the app which cracks me up too.

 

Wow, you can get the info with the gaptool app on phone? I was hoping the engine temp was somewhere in the instrument panel but can’t find it.

 

Lol thats not a high idle. All cars do that.

 

Thanks guys....Glad its doing what it should.

@ Phil, I consider it high idling only because when I put it in D or R the RPM's drop to about 650ish, which I consider normal.

 

Most cars, at least those that I’ve owned in my past 40+ years have a similar feature. Activating the AC bumps up the engine RPMs either by engine control electronics, or in older more primitive vehicles, switching on some type of solenoid which opens the throttle body wider to increase engine speed. Without that, the extra load placed on the engine when the compressor clutch engages would do just the opposite and bring the RPMs down. I had first hand experience with this years ago when a vehicle I owned, and was carbureted, would drop RPMs to a near stall when the AC was turned on. There was a small solenoid type actuator that would extend a small piston-like arm which would push on the throttle arm on the carb when the AC was called for. That device had failed, resulting in the RPM drop. Replacing it brought the RPMs up several hundred when using the AC.

 

Since the beginning of this scorching heat wave here in good old TX I have been noticing a higher-than-usual revs tendency on my 2020 110 SE.

Not only when parked, but also while driving when you are getting close to a Stop sign and let go the gas.

Was thinking on taking to the dealer, but seeing this thread made me less anxious now.