Tried the above and in my investigations, found something intriguing...
Firstly, cleared error codes and they didn't come back until i unplugged sensors again, so that's all they were indeed.
Readings and status were all stable and as expected.
Disconnected the stepper when it got up to temp, it was still hunting. Disconnected the tps, still hunted. Both times, car idled worse and came close to stalling as it hunted. Every sensor i disconnect seems to make it run worse.
I regapped the spark plugs to make sure they were all at 0.9mm, still popped and hunted, though i felt perhaps the tiniest fraction less often and less severely... interesting.
I then put the whole system under an almost full electrical load at idle, Headlights, hazards, heater fan, demister, rear fog, radio..... hot idle? perfect. very stable, absolutely no popping, Ecu was trying to target 864 rpm the whole time and it was fairly consistent around 859 (the lowest it dipped at all on IES readout) and 875 (the highest it went above target the whole time under load). As soon as the electrics were all off again, the idle pop, dip and hunt combo returned.
So that suggests to me the issue isn't a fundamental mechanical one and is related to electrical load.
Earths are all super clean, so not too sure where to start, but at least i have a direction now to investigate!
Firstly, cleared error codes and they didn't come back until i unplugged sensors again, so that's all they were indeed.
Readings and status were all stable and as expected.
Disconnected the stepper when it got up to temp, it was still hunting. Disconnected the tps, still hunted. Both times, car idled worse and came close to stalling as it hunted. Every sensor i disconnect seems to make it run worse.
I regapped the spark plugs to make sure they were all at 0.9mm, still popped and hunted, though i felt perhaps the tiniest fraction less often and less severely... interesting.
I then put the whole system under an almost full electrical load at idle, Headlights, hazards, heater fan, demister, rear fog, radio..... hot idle? perfect. very stable, absolutely no popping, Ecu was trying to target 864 rpm the whole time and it was fairly consistent around 859 (the lowest it dipped at all on IES readout) and 875 (the highest it went above target the whole time under load). As soon as the electrics were all off again, the idle pop, dip and hunt combo returned.
So that suggests to me the issue isn't a fundamental mechanical one and is related to electrical load.
Earths are all super clean, so not too sure where to start, but at least i have a direction now to investigate!
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