Stalling on entering idle

V3 BETA TESTS
1

Hi all, trying to understand what’s happening here, not sure if I’ve encountered a bug or have made a setup error.

Coasting to a stop. Overrun is cutting all fuel. As RPM drops into idle control range (1600rpm), overrun is blocked by idle and fuel injection resumes.
Shortly after, lambda is pinned full rich and the car stalls and floods. It’s not shown on the log, but it takes a lot of cranking with the throttle fully open to clear the flood and restart the engine.

The car will fairly consistently stall out like this if I don’t give the throttle a little blip as the revs fall. If just coast and clutch in like this, stall.

I don’t recall this happening on v3.031 (currently on v3.032) but I haven’t back to backed it to confirm.

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image1635×893 69.6 KB

Fiesta XR4 2.5 Turbo_v30.emub3 (65.8 KB)

stall at 9.49.emublog3 (1.2 MB)

2

In the log a very high asynch ACC enrichment can be seen befor the event:

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If those 1057ms injection time is really excuted, i think then this explains the flooding and the rich lambda. But injectors PW is normal.
Anyhow…if u can reproduce it reliable, i would try to disable asynch ACC enrich and see if the issue is gone.
But then the big question is why this is happening, cause ur asynch ACC settings look okay.

3

I’ll give that a go.

I did notice a bit of noise on the TPS rate channel. It took maxing out the TPS rate update interval to get rid of completely -which I opted not to do since I needed to drive the car a long way and didn’t have time to retune the accel enrichment

4

the async pw looks very improper.
Do you use the latest firmware?

You can try tondisable async acc and then check if problem is solved

5

Yep on latest firmware, I’ll try disabling Async enrich.

6

I can confirm there is a bug with async enrichment when anrichment occurs after fuel cut.

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