I think if you have an air leak the stepper position will drop to zero.
It might be useful (if it's not difficult) to deliberately create an air leak to validate this.
My understanding is that the ECU sees that the revs are too high and tries to close the throttle but can't close it below zero steps.
I thought I was there regarding a steady idle (875rpm, step 21) until I went for a spin today. After 15 minutes the steady idle I had was up to 1688rpm (albeit steady). Turn-off and then restarted - it adjusts back to circa 875rpm.
I got home, and following the advice above to the letter, disconnected the IACV and then adjusted the screw (both ways) but the RPM stayed on circa 1050rpm. I just do not seem to be able to get it down to 875rpm. Any thoughts?
On Pscan I get no error codes (other than the IACV because disconnected), I have already replaced the spark leads, coils, TPS, cam sensor, MAP (and the IACV). The throttle cable is as to should be (ie no pull on the cable when peddle not pressed).
Any ideas, please?
There are already three Linux versions available:-
x86 32 bit
x86 64 bit
ARM 32 bit (as in Raspberry Pi).
The x86 ones will work on an old Laptop running something like Debian or Ubuntu (I recommend Xubuntu or Lubuntu, but I think we have customers already using other distros).
I don't quite understand why more people don't try the Linux version.
What I can see from support requests is that the Linux version just never seems to have a problem. No hassles with antivirus (Windows), no hassles with major updates that change everything (Mac OS), cheap hardware. I have even had it working on a tiny ASUS EEE PC 701 which is small enough to keep in the car glovebox.
A workshop is a brutal environment for laptops, it's so easy to drop a laptop when you're working on a car. I would have thought that an old Dell D620/D630 running linux would be ideal.
I'm sure that lots of people would love Android support, but it's hard for me to do.
pscan has an awful lot of code in it now, and so changing programming languages or the development environment is basically impossible.
The environment that I use supports Windows and X11 out of the box and Cocoa is under development.
For Android I would have to redesign the user interface and widget library, which would be a lot of work. My current view is that my limited time is better spent working on car features that are missing as old laptops are cheap, but finding diagnostic tools that work on MG Rover [insert here] ECUs are not. One possibility is Linux ARM code that works on Android but through an X11 app (which are freely available), but so far I couldn't get it to work.
iphones and iPads are basically a nightmare to write code for unless you are well invested in the Apple eco system which I am not.
64 bit ARM linux is easy. I could probably do it in a couple of hours.
Indeed. Id never program anything with it.
You are welcome to use my ZT for testing (although with cruise not working that maybe an issue!) Im just north of Oxford though....
My ZT 190 is full spec, and thus as all the options/ecus if you wanted to use the chance to do more 75/ZT work. In fact, its rarely used these days.
It would be great if PSCAN could replicate the T4 with the 75/ZT , the abilty to match IPK/s ECMS, and general programming. The only thing non-T4 that coudl do more is TOAF, and thats pretty underdeveloped to be fair, and hence, I dont really like to use it.
One kind of wonders whether it was ever right....... As an aside, Pscan says that 25-27 is the correct setting. When you get below 25 steps Pscan says turn the screw anti-clockwise to increase the steps.
Interestingly, there is relatively very little on the Web about what to adjust the stepper to outside the Pscan forum.
Stepper running at 21 steps and RPM of 875 when water and oil fully hot. Appears to be rock steady but I have yet to go on a decent run to fully test. I marked the original position of the idle screw; I had to move it 1/2 turn clockwise (from the position when bought 15 years ago) to get it down from 55-60 steps to 21 steps which, to my mind, is a lot.
Thanks for the comments. I shall use 21 as the target now!