Idle Issues

[Billman]

After starting the stroker i started to map the car and noticed that when i go drive at lets say 2500 RPM and press the clutch the revs are falling and the engine simply stalls. When i let the car slow down into gear and let it go in gear till 1000 RPM and then press the clutch it idles nicely.

Anyone has an idea?

Tested with PID idle disabled and enabled no difference.

here are the settings i currently have (engine difference appart tha the new one is a stroker i also have a single mass lightened flywheel).

[A80Avant]

if PID for idle is disabled and it still does it , then likely not idle settings related

[Billman]

then what? I dont use it the IAC Valve.

[GazzaG60]

no idel valve.

1. throttle flap position setting.
2. throttle damper setting.
3. timing trough.

[Jamo]

Use a higher firmware and use the IAC

[terrybullwon]

I don't use either a valve or damper, the engine will not stall, so is it soft ware?

[Jamo]

I don't use either a valve or damper, the engine will not stall, so is it soft ware?

But your not using vems

[terrybullwon]

But your not using vems

That's what my next point was going to be so it must be the vems system

[Jamo]

That's what my next point was going to be so it must be the vems system

No not really, your car was setup from the off not to use an IAC with the ecu and again you don't have vems.

In the later firmwares you can set the default opening and closed positions of the IAC as even if you disable IAC in the firmware billmans is using it is likely the IAC is at a default position that's allowing air in.

That isn't a vems issue just the fact the IAC isn't actuated it maybe letting in air.

I had the same issues with IAC setup until firmware version 1.1.70 on my stroker.

In this version I could setup the default open positions vs temperature and then also specify the maximum open and closed position the IAC could go beyond regardless of temp.

By forcing the idle to be higher with the IAC positions vs temp and then letting the vems unit work in negative IAC range i've had 0 idle issues.

Billman have you completely removed the valve or is it still connected?

Might be worth removing the valve and bunging the holes if you have no intention of using it so there is no chance you are bleeding air

[Billman]

With stoke engine it idled very nice and had it for almost 3 years like this.

[Jamo]

Stroker pulls in a lot more vacuum though, this is most likely what is triggering the issue.

[A80Avant]

it seems that they may have made things easier with idle on later versions.

however either the IAC valve is staying open even disabled in which case the engine stalls, or there is something else related to the mechanical parts that is causing this problem.

[Jamo]

it seems that they may have made things easier with idle on later versions.

however either the IAC valve is staying open even disabled in which case the engine stalls, or there is something else related to the mechanical parts that is causing this problem.

That's exactly what i'm saying with IAC disabled it doesn't guarantee the valve is in the closed position from the last valve operation.

If you not going to use the IAC your best of removing it completely from the intake pipework.

[Billman]

I maybe going for iac then...I must check If I get it to work.

[A80Avant]

i had to knock it with a wrench a couple of times to get it to move again...!!