julianfoulger

I did find that the hose to the throttle from the IACV was back to front¦ it was rubbing up against the throttle position sensor until I turned the hose around but I doubt this will be the fix.

The TPS is new.

I have gone back to basics - I have adjusted the throttle idle valve to ensure that the physical throttle degree is ca. 4 degrees off the vertical. I have reset the TPS so it knows that the throttle is at 4 degrees at idle - at cold it is idling steadily at 1200rpm. Next week I will then test to see what happens on the idle RPM and stepper before, during and after a decent run, with PScan live data.

One thing that I have noticed from the PScan live data is that when the idle rpm rises to 1500 after a decent run, the stepper has risen to circa 60 steps. My logic would say that the car thinks that the throttle is closed (0 degrees or closed), so to get extra air it is opening up the bypass....resulting in too much air and therefore higher idle revs??????. Would this, therefore, indicate that the problem is the TPS, although the TPS is new?

Thanks for the other suggestions which I will follow up.