Idle

[deano59]

Hey guys, I had the edit and tune done last week and occassionally on starting the car the engine surges to 2200rpm and after a couple of seconds drops back down to around 1000rpm, has anyone else had this happen and is there a simple fix.

Thanks

[markxr6t]

Yep - happened to mine for a few weeks and has now gone away by itself. I didn't think the edit did anything to your idle though.

Can't be good for the turbo boosting at startup, without circulating oil.....

[IH8TOADS]

Yeah my 6sp does this. Try putting the clutch in and out both in and out of gear. I have not got the edit. Only does it on cold starts right???

[bugster70]

Mine does it too. In fact, I've had a few different experiences. My factory (ie. pre-Edit) tune did this and revved to around the 2200rpm mark. I then loaded some generic CAPA tunes in and, whilst it still did this, it didn't rev quite as high. I then had a 12psi map from Xtreme and the car started 'normally' with no rev surge at all. Now that I have custom tunes in, the surge is back.

But yes, only happens on cold start ups and only lasts a very short while. I agree it's a bit disconcerting to have the engine rev like that when it's cold and starved of oil, but I don't think there's too much I can do about right now and I try to tell myself it must be okay 'cos that's what the factory map was doing anyway!

[IH8TOADS]

She'll be right mate!!!!

[Paradoxx]

Sounds like the old cold idle bypass valve issue I have had with other cars. If it setup the same as the TB on the VR4, there is a wax pellet which opens up a bypass letting air into the TB bypassing the butterfly. When it warms up it melts and closes the valve. Sometimes it doesn't solidify in the right way and leaves the bypass open too far causing it to idle too high.

If it is setup differently then I dont really know... must be an ECU confusion. I get it regularly with my stock T when starting and driving out of the car park in first, put the clutch in and she idles over 2 grand for a while. It usually drops after a few seconds but so I dont think it's gonna do much damage.

[dingah2]

I've got the very latest Ford flash on my PCM (thanks Wog!) and it gives about 2 seconds to 2000RPM then straight down to a cold idle of about 1100RPM.

Dingah

[Street Tuner]

This start up flare is easily controlled (increased or decreased) by a competent Edit Tuner. There is a single table that controls the amount of extra air ingested on start up, and when modified, can give almost any desired result.

[jetute]

  Street Tuner said:

This start up flare is easily controlled (increased or decreased) by a competent Edit Tuner. There is a single table that controls the amount of extra air ingested on start up, and when modified, can give almost any desired result.

very true... mine works great with a custom tune... star up flare?? whats that

[Xtreme F6]

  bugster70 said:

Mine does it too.  In fact, I've had a few different experiences.  My factory (ie. pre-Edit) tune did this and revved to around the 2200rpm mark.  I then loaded some generic CAPA tunes in and, whilst it still did this, it didn't rev quite as high.  I then had a 12psi map from Xtreme and the car started 'normally' with no rev surge at all.  Now that I have custom tunes in, the surge is back. 

But yes, only happens on cold start ups and only lasts a very short while.  I agree it's a bit disconcerting to have the engine rev like that when it's cold and starved of oil, but I don't think there's too much I can do about right now and I try to tell myself it must be okay 'cos that's what the factory map was doing anyway!   

we can control this in the software and basicly fix it .