Technical Stilo 1.6 16v - Bad idle, phonic wheel - in progress

[Alex07fiat]

Hi,
I checked in MES, Phonic wheel learn status is IN PROGRESS, even if I followed the learn procedure, 3 x >5000 rot/min.

ECU was replaced 1 year ago, lambda 1, a month ago.


If I disconnect lambda 1, engine idle is better and no staling as before.

What is happening with my engine?

Why phonic wheel don't change status?

 

[Ralf S.]

Let's try analogue.

What's wrong with the car?



Ralf S.

 

[Yellow Peril]

Uneven idle can be cured by cleaning the inlet control valve. There's a 'how to' guide here:

https://www.fiatforum.com/stilo-guides/83260-cleaning-your-inlet-control-valve.html

 

[Alex07fiat]

Here is the problem.

Throttle body is cleaned.

[ame]https://youtu.be/HoAdpv_ViAw[/ame]

 

[Yellow Peril]

Looks like the servo motor in the throttle body may have failed.

 

[Alex07fiat]

If lambda 1 is disconnected, engine idle is ok.
So I don't think the throttle body is the problem here.:-|

[ame]https://youtu.be/m3R_4TCmzFg[/ame]

 

[Ralf S.]

Normally I would say it's the idle control valve but if you've cleaned it and it works okay without the lambada sensor connected, then that would suggest it's something else.

On the other hand, if disconnecting the lambda sensor makes it better, then it could be the sensor. Do you have a spare lambda you can fit, to see if that solves the problem?


Ralf S.

 

[Alex07fiat]

The same I thought and replaced lambda 1.

Then I checked the wire connection between lambda 1 and ECU as follow: value from MES(ecu) and from voltmeter right after sensor, are the same. So that's ok.:|