Pops in Neutral

[Tcoat]

Originally Posted by Varelco

Mine does it on the stock map under the right conditions. On high idle sometimes if I blip the throttle it pops and burbles nicely, doesn't when its warm or during the 'pulse jet/sonic boom part of a cold start. Anyone know what the ECU does in a high idle as to why it might do this?

Pours more fuel in.

[tomm.brz]

Originally Posted by Tcoat

Pours more fuel in.

No.

Actually cold start is leanish in this car, warm start too a little
And it's actually in open loop state when you first start it cold

If you measure AFR with a wideband with a stock tune, you ll see subaru afr stuck around 14.7/15.16 (it has various level undefined to me)
Meanwhile the wideband measures even slightly leaner

The pops are from stratified and retarded DI injection and negative ignition timing, combined with the timing retard induced by the throttle blipping, both pushing it and releasing it

There are also other OEM tables that limit the amount of retard while coolant is cold and while clutch is pressed (ever noticed sound changes when you press clutch to go in reverse during cold start?) and while it's complicated to see how and when those tables act, the burbles you get are mostly from retarded ignition timings

[Ernest72]

Just no!

[Tcoat]

Originally Posted by Varelco

if I blip the throttle it pops and burbles nicely,

Originally Posted by Tcoat

Pours more fuel in.

Originally Posted by tomm.brz

No.

Actually cold start is leanish in this car,

Sorry I wasn't clear on what part of his comment I was addressing.
Yes all you said is accurate and when you add sudden fuel to those conditions you get more pops than normal.

[steve99]

Originally Posted by Varelco

Mine does it on the stock map under the right conditions. On high idle sometimes if I blip the throttle it pops and burbles nicely, doesn't when its warm or during the 'pulse jet/sonic boom part of a cold start. Anyone know what the ECU does in a high idle as to why it might do this?

During high idle cold start ecu also retards timing stock its -15

[soundman98]

Originally Posted by JD001

I am hoping that the audio on my phone is shite.

it could be, but it's not the problem here.

[Ultramaroon]

Originally Posted by soundman98

it could be, but it's not the problem here.

lol

[Ultramaroon]

Originally Posted by steve99

During high idle cold start ecu also retards timing stock its -15

This thread is retarded -15