Getting my vts to idle?

[Thunderz]

My 02 VTS has 708 cams and at throttle bodies on it.
It has been mapped on a rolling road.

It starts up perfectly and idles on 1k perfectly when cold.
As soon as its done a mile or so and started to warm up if you take your fut off the pedal when stopped the vrevs will just bottom out and it will stall.

I presume this is something to do with AFR when its warmed up.

It is running a 3 plug pred ecu.
I have looked at the fuel table myself and tried different things on tuner studio but I am not that clued up on it.

Can anyone help please

[Laurynas]

Di you have a map sensor?

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[edbar1]

Map sensor?

[luthor1]

Increase the idle dashpot level. This says that if you idle at, say, 20 stepper motor steps, when you go on the throttle and come off again the idle steps pop up to 25 (or whatever you configure). This means when you come off the throttle later on there is a cushion of increased idle to prevent stalling

[Thunderz]

Originally Posted by luthor1

Increase the idle dashpot level. This says that if you idle at, say, 20 stepper motor steps, when you go on the throttle and come off again the idle steps pop up to 25 (or whatever you configure). This means when you come off the throttle later on there is a cushion of increased idle to prevent stalling

Thanks for the replys.
Andy, is the dashpot level a setting that is done in tuner studio? I will plug in over the weekend and see if I can find it.

[luthor1]

yes (blah blah because I need at least 6 characters blah)

[Thunderz]

Ok so I plugged into the pred and had a play about. Im not sure if that was the issue.

I started the car up cold and let it run on the drive.
As said earlier it idles fine cold around 10-12k revs.

As soon as the coolent temp reaches around 60 degrees C the revs just drop and the car stalls.
I presume its wanting more air and less fuel at the higher temp?

[luthor1]

at 60 degrees, probably the "Warmup Enrichment" (WUE) drops away, so you may find you are lean at idle?

You can turn off closed-loop idle and just tune the number of steps then use the spark-scatter option to stabilise it if you want?

Have you got a wideband?

[Thunderz]

Originally Posted by luthor1

at 60 degrees, probably the "Warmup Enrichment" (WUE) drops away, so you may find you are lean at idle?

You can turn off closed-loop idle and just tune the number of steps then use the spark-scatter option to stabilise it if you want?

Have you got a wideband?

Yeah I would say its running rich at that temp and that is why the revs are dropping to a stall.

That sounds like a plan. Is the setting for turning that off in the idle control? How do you tune in the number of steps etc or is that something I may have to get you to look at remotely?

No, still no wideband