Lambda sensor
I recently replaced my lambda sensor after at least 300K miles, but it could very well have been the original one, so in taht case add another 100K miles. I have always been running it on LPG which is quite soft on the sensor, but even then, there would not have been much life left in it. It runs a bit smoother now, but I didn't notice any change in idling behaviour before or after.
I do not think the PAS will have an influence, as the ECU would compensate for the additional resistance after it has seen a speed drop below 850 rpm (closed throttle (TPS) and zero speed), not on beforehand. The only additional loads it compensates for on beforehand are the AC engage signal, E-fan engage signal and auto gearbox not in P signal. But as you grounded the applicable pins of the LH you are apperently aware of that.
What I did notice however, is that when the car has been driven off with a cold engine and only stopped for the first time after the engine is fully warmed up, the re-adjusting of the idle speed takes several seconds of standstill. If the period in between has been more than say 20 minutes or so, it sometimes happens that the idle speed is not controlled back properly, but remains at high idle. It then helps to strangle the engine to less than idle, after which the idle speed control is reset and works fine again.
What happens if you strangle the engine a bit when it is running at high idle?
Rob
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