ECMlink Lean idle and cruise

[LTUDSM]

Just wired up afx wideband ro ecmlink.Did a pull and i see,that im super lean in the low rpms and a bit rich at wot.the idle is really lean too.Here is couple of logs

 

[twdorris]

I see what I believe are a couple different problems.

First, the AFXWB output doesn't seem to match the front O2 value. Is the front O2 value a factory narrowband sensor or is it a simulated output coming from the AFX?

In either case, even when the front o2 says rich, the AFXWB stays pegged at 5v (16:1). So something seems off.

Second, the front O2 signal seems to lag behind what the ECU is doing, causing idle oscillation during closed loop. You can either try locking the car in open loop mode (cheap, easy fix for now) or you can move the wideband sensor into the front O2 bung or you can spend some time getting the fuel trim update rates (STFTAndO2Feedback tab in direct access) dialed in.

The best choice, IMO, is to move the wideband sensor to the front O2 bung. But I'm not sure where it's installed at the moment. Maybe it's there already and the problem is just sluggish sensor. I don't know.

Failing that, you should try to slow the fuel trip update rate down a good bit and try bumping up the O2FeedbackAdjRate.

Thomas Dorris

 

[LTUDSM]

I see what I believe are a couple different problems.

First, the AFXWB output doesn't seem to match the front O2 value. Is the front O2 value a factory narrowband sensor or is it a simulated output coming from the AFX?

In either case, even when the front o2 says rich, the AFXWB stays pegged at 5v (16:1). So something seems off.

Second, the front O2 signal seems to lag behind what the ECU is doing, causing idle oscillation during closed loop. You can either try locking the car in open loop mode (cheap, easy fix for now) or you can move the wideband sensor into the front O2 bung or you can spend some time getting the fuel trim update rates (STFTAndO2Feedback tab in direct access) dialed in.

The best choice, IMO, is to move the wideband sensor to the front O2 bung. But I'm not sure where it's installed at the moment. Maybe it's there already and the problem is just sluggish sensor. I don't know.

Failing that, you should try to slow the fuel trip update rate down a good bit and try bumping up the O2FeedbackAdjRate.

Thomas Dorris

Yes the front o2 is a factory NB sensor. My wideband sensor sits 2FT from flexpipe. Yesterday i bought a NGK wideband sensor,so i know its in a working condition.So you saying,that i need to swich the front o2 with wideband sensor??

 

[twdorris]

So you saying,that i need to swich the front o2 with wideband sensor??

No, I'd leave it, at least for now. The factory narrowband sensor works GREAT at what it does and serves as a good reference for checking wideband operation. I'm just surprised to see the factory narrowband responding so slowly.

Add CombinedFT to your log and let the car idle for a minute or so and let's see how far off things are.

Thomas Dorris

 

[LTUDSM]

No, I'd leave it, at least for now. The factory narrowband sensor works GREAT at what it does and serves as a good reference for checking wideband operation. I'm just surprised to see the factory narrowband responding so slowly.

Add CombinedFT to your log and let the car idle for a minute or so and let's see how far off things are.

Thomas Dorris

What is CombinedFT ???
im newb to the ecmlink world and still learning things...

 

[snowborder714]

v3combinedft [ECMTuning - wiki]

 

[LTUDSM]

v3combinedft [ECMTuning - wiki]

yeaaahhh ater a long search i find what it is DD Thanks Brian