Androo

1992 Eunos Roadster with 1.6 short-nose engine, TD04 turbo, EV14s, MSLabs MS3 Mini, sequential injection, Toyota COPs.

I've had this issue for ages and it drives me nuts - coming off idle when the engine is cold / warming up, touching the throttle makes the car stall or almost stall for a moment, before it revs up. Makes the car a pig to drive until its well warmed up. Another thing - until its been running for maybe 20 minutes the idle will sometimes decide to sit at circa 2,000. But not always.

I've tried increasing Accel Enrichment, but this doesn't seem to help. Got a BMW VTS properly set up. Sometimes I can smell petrol (or gas if you're USA) when this is happening, which makes me wonder of the mixture is getting lit on all four cylinders. Tried changing plugs and all four coils, and replaced the coil wiring with a new thick dedicated wire providing the power to the coils from a new relay.

What could be causing this?

redursidae

Can you post the log that matches your screenshot? Right off the bat, your Cold Accel multiplier seems too low to me, and maybe increase your Full Accel Below RPM to 2k? You should tune your Accel Enrich to work well while warm, then increase your Cold multipliers accordingly. "TPSdot Uses %WOT" is also a very nice feature that helps with accel enrich that you could play with.

Androo

Here are the logs I took today, one of these is the one I screen-shotted, the other is from either right before or right after (I forget which one I shot from).

redursidae

I see two main things:

- The car is idling rich, 11.6 to 12.5, so when you blip the throttle it could be running rich enough to misfire and showing lean
- Acceleration enrichment is not always taking place in your blips because the threshold is a bit high. Try lowering the threshold some

So my input is to remove some WUE, add more cold multiplier to AE, and reduce your acceleration enrichment threshold.

In my own car, at 25C, it idles at 14.2 AFR. At 5C I target around 13.8.