Idling at 1400 rpm

[Meatball]

Any pointers to the cause of my high idle, stepper motor and housing are clean, i cant find any air leaks and the throttle return position is correct.
Im using megasquirt if that helps
thanks

[Simon says]

Hi Ben are you using Megatune or Tunerstudio? as this started out of the blue or as this been a problem before? sounds like an idle steps value problem in your controller possibly

[Meatball]

Simon says said:

Hi Ben are you using Megatune or Tunerstudio? as this started out of the blue or as this been a problem before? sounds like an idle steps value problem in your controller possibly

Hi mate, Its been doing it for a while tbh, ive never altered the idle steps on the squirt but it sounds like a good place to start. It also ties into how it starts at 1000rpm then moves upto 1400rpm (when warm)ill have a read up
Thanks
im using the tunerstudio btw

[Simon says]

To be honest I can see why some people move away from the RV8 stepper and fit a conventional rotary idle valve (far more stable) as its far from the best way to control idle speed on the RV8,mine was a devil to get to behave as I wanted it to especially from cold(I like a fast idle)I also have the stepper settings control set on "always on" rather than "moving only" as I find this far more consistent,in fact this caused the only problem as far as my MS2 install is concerned and no fault of the ECU have a look at your IAC step bins within startup/idle menu idle steps and tighten them up a little at your running temp

Edited by Simon says on Friday 22 April 20:38

[Meatball]

Hmmm this has got me a bit puzzled, ive tried altering the megasquirt settings as mentioned by Simon but it dosent alter my idle?
I tried to clamp the connecting pipe to the stepper to reset the idle.. again made no difference?
With the idle screws fully wound in it gives me 1400rpm? clamp the pipe no change
The steppers working as much as i can tell, its got power and goes in and out when cycling the ignition.

one strange thing i should mention is i turn the car on when warm and it sits at a steady 1000rpm twenty seconds later it will jump to 1400-1600rpm with a steady idle

What next? except the petrol and matches route...im not there quite yet.

edited to add squirt idle step bins


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Edited by Meatball on Saturday 23 April 18:21

[SILICONE KID]

Is your stepper wired the wrong way round..

[Simon says]

Those bins should not be giving you the problems you are experiencing Ben I suspect the trouble is elsewhere are you using the twin butterfly plenum by chance? as I seem to remember them having trouble with the shafts twisting or similar causing the butterflies not to close down correctly or similar(not sure & may be wrong)if you have un-metered air entering the plenum you need to correct this otherwise your likely to have all kinds of low speed issues and your TPS will be getting lied to,you need to confirm that both discs/butterflies are closing down when the throttle is shut and then just have a nats air gap (5 thou approx) so they don't close to far and jam in there housing they may just need realigning in there bore as binding in the housing is not ideal what Daz mentioned is also possible too on MS but as I was under the impression you had your install on the car sometime now and this could not have always been the case surely

Edited by Simon says on Sunday 24th April 08:50

[Meatball]

Hi Simon, im using a single throttle at the moment and the plenum is set up as you mentioned. Im wondering if the bins are the wrong way round? as its getting warmer shouldnt the stepper be used less? or have i got it the wrong way round
ill have another go on the laptop once i can get it to hold charge long enough
the point daz made cant be right as its plug and play so the wirings never changed from day 1.

[Simon says]

Hello Ben,are you sure you don't have an airleak from the trumpet base,plenum etc?

Edited by Simon says on Sunday 24th April 16:18

[Simon says]

spend said:

Bung up everything 1x1 that can let extra air in, FPR, brake, purge, advance, PCV, stepper feed pipe, if that doesn't fix it I'd guess you still haven't set the base idle properly.

Think this should get you somewhere Ben

[Meatball]

Im a little puzzled, i think i can rule out the stepper bins (thanks Simon :thumup:, i cant find an air leak
Ive got no manual adjustment on the idle, clamping the hose makes no difference as does disconecting the stepper.
I followed the instructions by the bible
I guess its time to strip it down and get the silicone out again.

[Meatball]

FFS sussed it, my new plenum didnt have the water jacket thingy fitted underneath!!!!! and numbnuts didnt notice when fitting it, hence the air leak.
what a tit!!!

[Simon says]

Nice one you won't do that again in a hurry but if you do may we call you a TIT?

Edited by Simon says on Sunday 24th April 16:20

[daxtojeiro]

You've also wired the stepper the wrong way round as Silicon Kid says. The steps should decrease as your temperature increases. I've replied to this question on the V8 forum, but incase you miss it I have a couple of videos and help files on my site:

http://www.extraefi.co.uk/Drawings/PDF_Files/RV8_S...

http://www.extraefi.co.uk/idlevalve.htm

http://www.youtube.com/extraefi

cheers
Phil

[Meatball]

daxtojeiro said:

You've also wired the stepper the wrong way round as Silicon Kid says. The steps should decrease as your temperature increases. I've replied to this question on the V8 forum, but incase you miss it I have a couple of videos and help files on my site:

http://www.extraefi.co.uk/Drawings/PDF_Files/RV8_S...

http://www.extraefi.co.uk/idlevalve.htm

http://www.youtube.com/extraefi

cheers
Phil

Hi Phil, Thats a bit odd as im running the megasquirt via your plug and play, as you know the stepper wiring is using the original lucas loom? and the map i posted was the map which came on the disc AFAIK no ones set the bins that way???

[Meatball]

Is it me or do posts on this subject keep disappearing?