Idle issue?

[FRSFirestorm]

Originally Posted by RoryTate

Blatantly stolen from an Outback forum:

I've had my FRS for a few weeks. My idle was dipping near stall then bouncing up to 1000 or so then settling back down. Turns out it was the A/C compressor cycling from these dial settings. Put it to another setting and it never skipped a beat.

Thanks for the post!

[Sigh-on-Rice]

Originally Posted by FRSFirestorm

I've had my FRS for a few weeks. My idle was dipping near stall then bouncing up to 1000 or so then settling back down. Turns out it was the A/C compressor cycling from these dial settings. Put it to another setting and it never skipped a beat.

Thanks for the post!

Doesn't it mean it will have idle dip if you turn on the AC?

[FRSFirestorm]

Originally Posted by Sigh-on-Rice

Doesn't it mean it will have idle dip if you turn on the AC?

I'd say it will.

I have some experience with tuning GM LS series engines. There appears to be a hole in the tuning for A/C cycling in this Subaru platform. Tweaking routines in the GM tune you could really minimize the effect of A/C compressor kick at idle.

[Subie]

Originally Posted by FRSFirestorm

I'd say it will.

I have some experience with tuning GM LS series engines. There appears to be a hole in the tuning for A/C cycling in this Subaru platform. Tweaking routines in the GM tune you could really minimize the effect of A/C compressor kick at idle.

My tC had a similar but much worse idle dip than my BRZ, with or without the A/C on. I'll bet Toyota had a hand in the idle programming of these cars.

[jesseps]

My car started to rough idle this morning and it smelling really bad.

Thing is I put in the right gas in the car. I am actually scared to drive the car to the dealership. I guess I will have the car towed there.

[Wankel Rex]

I've been having inconsistent idle the past two days. Tonight I noticed something cycling on and off in conjunction with the idle changes. Sure enough, I had the fan set to a mix between floor and defrost as it's been raining for the past two days.

Switched to floor only, idle issue stopped.

[Sigh-on-Rice]

Originally Posted by Wankel Rex

I've been having inconsistent idle the past two days. Tonight I noticed something cycling on and off in conjunction with the idle changes. Sure enough, I had the fan set to a mix between floor and defrost as it's been raining for the past two days.

Switched to floor only, idle issue stopped.

To me, there shouldn't be idle issue regardless of the compressor on or off.
How low does your idle RPM drop to with the compressor on?
Does it drop to like 400 and the car shudders?

[whtchocla7e]

I've mentioned it before many times that my idle drop only happens when the compresor is running. Nobody seemed to care. At least now there's another person who confirms it.

[Sigh-on-Rice]

Originally Posted by whtchocla7e

I've mentioned it before many times that my idle drop only happens when the compresor is running. Nobody seemed to care. At least now there's another person who confirms it.

Mine happens only when the compressor is running too. But what gets me is that it only happens a few times a month. Idle drops every 15 seconds or so when the compressor turn on and off, and low enough for it to shudder a bit. It keeps doing that until I turn the engine off and turn it back on. Other than those few times a month, the idle is stable even with the compressor running. It's weird.

[Wankel Rex]

It normally idles at roughly 650 RPM, drops to 500 or so as the compressor kicks on. Same thing happens if you press both power window switches; dips for a second then compensates for the added load.

I wouldn't say it shudders, but it gets a little rough when it dips. I can feel it mainly if I'm resting my hand on the shifter (which I usually am when stopped at a light).

[EK_Golfer]

Mine idles roughly around 600 as well. Not much shuttering though. Is it safe to assume 600rpm idling is ok?

[Sigh-on-Rice]

Originally Posted by EK_Golfer

Mine idles roughly around 600 as well. Not much shuttering though. Is it safe to assume 600rpm idling is ok?

My manual trans idles at 600 without A/C and 650 with A/C.
I heard automatic trans idles a little bit higher.

[Craig]

My car just starting exhibiting some strange idling issues. I've got an AT, when sitting in park with heat off / dials not set like @FRSFirestorm said, and RPM goes from 600 (normal) drops to ~350 then shoots up to ~750, then dips to 600.

Goin in for my free oil change/crickets/odds and ends, i'll be sure to bring this up if it continues.

[atledreier]

Mine had a weird idle dip yesterday as well. No CEL as of yet, but I guess it's only a matter of time now...

GT86, Norway, 3500km, MT, VIN 009099