Resolved What effects Closed Loop!?

[xxShaneOmac]

Whats Sensors / Variables are affected pre / post closed loop.

Open loop - Car is cold extra gas?
Closed loop - Car has reached op temp less gass?

What sensors either start or stop working at this point?
I.e FAIV closes once you reach op temp (?) etc.

I have a horrible Gas / Air / maulfunctioning sensor probelm once I reach closed loop
(Im assuming its closed loop, once the car is at operating tempature)

o2 Sensor? TPS ISC MAF FAIV EGR FPS FPR Injectors Gas pump??

IF, how are these affected and may cause a shortage of air / fuel?

At Op temp my idle Drops and chokes the car then bounces back to normal (never above normal idle rpm)

<5% throttle at results in harsh bucking at op temp.

Help thanks!

 

[Avionixx]

Very good info from the DSMLink folks here:
fueltrimupdatepoints [ECMTuning - wiki]

Do you have a logger so you can monitor what your ECU is seeing from all of the various sensors?

 

[xxShaneOmac]

Good information for tuning.

Only hardware devices were the Front o2 and ECU.

I pulled and opend my ECU and it looks ok. but thats only visual.

And my front o2 might be going bad.
I dont have a datalogger tho :[

Maybe my front o2..

 

[redyute1]

coolant temp sensor & 02 sensor will affect closed loop,in closed loop the ecu is running the engine based on info gathered by the sensors,the coolant temp sensor would let the ecu know that the engine has reached normal working temperartue so it can adjust injector pulse,then the 02 sensor will let it know if that fuel is beeing burnt properly,so i'd say check the 02 sensor or sensors & temperature sensor

 

[CTP]

MAF also effects open/closed loop. The ECU goes into open loop at a certain load as well. It isn't just coolant temp based.

 

[xxShaneOmac]

So Im more on the Sensors that Start working during closed loop.

Cause at closed loop ( Im guessing my car is in closed loop cause it is FUBAR during operating temp) my car bucks at slight throttle and drops rpm durning idle.

Fuel / Air related im 90% sure and o2 comes into affect. I bet its that.

 

[delta448]

Any chance of a post MAF air leak?
You can use your DSMLink setup to check the O2 sensor voltage and see if it's oscillating normally...

 

[xxShaneOmac]

This went from a general question to a specif problem and I did not address the orginal post so.

This is happening on my 2.0 NT 93 Talon.

So I dont have DSMLink on that car, Sorry for the confusion.

And yes there is a chance of a Post MAF Air Leak. I should get some of that spray and check if my idle raises.