S40: V40 2.0t '01 Underboosting

[bobe84]

Originally Posted by ww1dm1

That's the whole point, closed loop should be entered when the engine is sufficiently warm, if I recall it was 40-50ish degrees. It would be silly to go closed loop while the engine is still artificially richening the mixture to keep the engine driveable.

How much time you wait for your car to go into close loop?

I think that when ECU realizes that O2 is starting to generate voltage it switches to closed loop... Am i right?

something i found now:Varies by maker and model. On my Series III, to use something I'm familiar with, it doesn't go into closed loop until 80 degrees C engine coolant temperature. My 87 was among the first to have a heated oxygen sensor so technically that's ready in about 30 seconds to 3 minutes, but the engine still needs cold start enrichment beyond that time period ('choke' if you will) so it (like many cars) won't go into closed loop until the engine is warm enough that it doesn't need cold start enrichment any more.

[ww1dm1]

Originally Posted by bobe84

How much time you wait for your car to go into close loop?

I think that when ECU realizes that O2 is starting to generate voltage it switches to closed loop... Am i right?

something i found now:Varies by maker and model. On my Series III, to use something I'm familiar with, it doesn't go into closed loop until 80 degrees C engine coolant temperature. My 87 was among the first to have a heated oxygen sensor so technically that's ready in about 30 seconds to 3 minutes, but the engine still needs cold start enrichment beyond that time period ('choke' if you will) so it (like many cars) won't go into closed loop until the engine is warm enough that it doesn't need cold start enrichment any more.

Well, I don't really wait for it, so it's difficult to tell. Though it certainly isn't 20 seconds, I need to drive for a bit. I always thought that the switch to closed loop is initiated by temperature, though I'm not entirely sure if it's that alone. But going any time while the engine forces a rich mixture would be kind of counter productive, as closed loop tries to keep the mixture ratio at the stoichiometric point (which you don't want at the time).

[bobe84]

It could be just that my O2 sensor heats up quicker, or it is going bad or something else...