MicroSquirt.com read only forum (Jan.15,2018)

Hi all..

I am running MS&extra/edis with MT717 on my zetec turbo. Everything is cool apart from starting. Cranking fuel is alright now but my ASE is not doing the job!

My cold enrichment modifiers are fine. I've configured the ASE to Decay over 15 seconds. At say 4C, i've got it set to 10%. I can't get the car to fire and idle on the button (when the pistons are cold). I have to start it with some throttle, let the pistons heat up, then it'll idle fine.

Any thoughts? I'm not using an ISCV. My base idle is ~1500rpm which I am pulling down to 900rpm with 8 deg of ignition.

Can someone please confirm if the ASE is _additional_ to the CLT-based enrichments, or are these turned off during the ASE period?

Thanks,

Stu

Post an MSQ please

AW

whittlebeast wrote:Post an MSQ please

AW

Dont have one to hand right now, sorry.

I'm assuming your base VE map is well tuned. If it isn't, that's where you start.

Without logs and a .msq, I can only take a WAG (Wild a-- Guess).

I would say add ASE and reduce the time it's active. Also, visit your ignition timing. You might need to add more timing when cold. This could come in the form of adding more to the base map and squeezing down on the throttle body air bleed/throttle stop, or it could come in the form of an IACV.

Only do one thing at a time, then evaluate its effect. If the engine responds well, then do more of it until the engine doesn't respond well. You know...the tuning process...

Enthalpy wrote:Without logs and a .msq, I can only take a WAG (Wild a-- Guess).

I would say add ASE and reduce the time it's active. Also, visit your ignition timing. You might need to add more timing when cold. This could come in the form of adding more to the base map and squeezing down on the throttle body air bleed/throttle stop, or it could come in the form of an IACV.

Only do one thing at a time, then evaluate its effect. If the engine responds well, then do more of it until the engine doesn't respond well. You know...the tuning process...

Yeah, I am running advance with temperature. At say 4C, it'll be running around 25 degrees advance. It idles fine at 900rpm when cold (sure, it'd be nice to be a little bit higher, the extra torque of say 1100rpm makes things to much easier) but I do need to raise the base idle a bit and remap the idle spark values. This might make a difference so i'll give it a go.

When you tell me that cracking the throttle helps a ton, that tells me you need more air at startup, which an IACV would provide. In the absence of that, I would try the air bleed/throttle stop idea first.

Don't forget to recal your TPS if you mess with the throttle stop.

Enthalpy wrote:When you tell me that cracking the throttle helps a ton, that tells me you need more air at startup, which an IACV would provide. In the absence of that, I would try the air bleed/throttle stop idea first.

Don't forget to recal your TPS if you mess with the throttle stop.

Well, as I said initially, it's only an issue whilst the pistons are cold. It doesn't take very long for them to get up to a reasonable temperature for burn purposes, typically under 20 seconds. But yes, more air = more fuel = more torque, which has a similar result as me holding it at 2000rpm for 10 seconds

I'll give it a go and feed back...