as above, was thinking switching to constant open loop. only know that in this mode car disregards o2 and runs only on map afrs.
is there anything else I should know or take into consideration ?

 

Only "side-effect" is that you need to check your fuel map to make sure AFR's are OK when cruising and idling. So it might take a bit of messing around with the fuel map, but other than that I don't see any negative side effects that could occur from running full-time open-loop

 

As well you might need to tune warm up enrichment maps a little bit, especially if you want to lean out your idle a little bit.

 

these cars run open loop fairly easy and decent actually. i do it on some of my sd cars.

 

I'm going to zero out or lower tps and load thresholds, all four tables. is it correct way ?

 

what to aim for ?

 

sub'd for more answers

 

You may need a little bit more fuel, when engine is cold, in order to get more stable, smooth idle, in some case leaner AFR may result in a rough idle while warming up. In closed loop warm up is controlled by lamba as well.

 

under what table is that warm-up enrichment map located ?
can't see it anywhere in my 96530706 v7 rom
only see warm-up ignition retard

 

Wouldn't the "self-calibration" of the injectors be disabled. Lets say, that over time the injectors become dirty to the point the car runs dangerously lean. If in open loop constantly would it not fail to throw a P0171?

 

Why would the injectors become dirtier from running at the same AFR but in open loop instead of closed?

 

That's not what is not what I ment.

 

Then what did you mean?

 

Lets say the injectors get dirty because of contaminated gas (it is just an example, concentrate on the fact that the injectorts progressively deliver less fuel). Without closed loop, the ECU will never adjust the STFT and LTFT and so not know that the that the car is running lean since fuel trims will remain constant. If fuel trims remain constant and inside the 25% limit, it should not produce a P0171 event.

 

Ah I see what you mean now.