Technical Why is my engine idle inconsistent?

[Mike1alike]

Also, for both of you @Fiat500Fiat500Fiat500 and @macpoland, I recommend you check and clean the BCM ground point. I wrote about it here, that's on my Punto, but it should something similar on yours, yoo.

BCM (Body Computer Module) ground and other electrical gremlins | FIAT Punto (Mk2/2b)

I just discovered the BCM grounding point on my Punto. The electrical system is very similar across most of the FIAT models, so this topic is not Punto exclusive. What happened I noticed idle dipping very short while engine was on warming up temp (40~70 ⁰C) and being stop at red lights. Dipping...

www.fiatforum.com

 

[macpoland]

Also, for both of you @Fiat500Fiat500Fiat500 and @macpoland, I recommend you check and clean the BCM ground point. I wrote about it here, that's on my Punto, but it should something similar on yours, yoo.

BCM (Body Computer Module) ground and other electrical gremlins | FIAT Punto (Mk2/2b)

I just discovered the BCM grounding point on my Punto. The electrical system is very similar across most of the FIAT models, so this topic is not Punto exclusive. What happened I noticed idle dipping very short while engine was on warming up temp (40~70 ⁰C) and being stop at red lights. Dipping...

www.fiatforum.com

Sprawdzilem ten przewod jest jak nowy.

 

[macpoland]

Zauważylem ze przewód (00518676930) w miejscu laczenia z podłużnica jest zielony, ale pod szybko złaczka do klemy minus jest czysta miedź. Czy to może powodować problem?

 

[Mike1alike]

Zauważylem ze przewód (00518676930) w miejscu laczenia z podłużnica jest zielony, ale pod szybko złaczka do klemy minus jest czysta miedź. Czy to może powodować problem?

First, can you post in English, please?
Best way to know for sure if there is a problem with it is by doing a voltage drop test. Engine running, have a multimeter set on DC Volts. Have red lead on battery negative terminal and black lead on that connector. Note the value it shows. Then turn on electrical consumers and do the same measurement again.
Good value is under 0.40 V. If you get a high number there, means there is a problem on that circuit.

 

[Mike1alike]

Sprawdzilem ten przewod jest jak nowy.

How is the throttle body? Did you do a reset, parameters relearn?

 

[macpoland]

Hi, sorry, I don't speak English; I'll use a translator.

I have a new throttle body. I reset the self-adaptive parameters and reset the throttle body with the engine warm and the lights and blower off.

Status accepted.

I checked the charging at the alternator and the positive terminal - 14.1v.

This is my second car, which I bought for commuting, but it's starting to make it hard for me to sleep

 

[Fiat500Fiat500Fiat500]

Also, for both of you @Fiat500Fiat500Fiat500 and @macpoland, I recommend you check and clean the BCM ground point. I wrote about it here, that's on my Punto, but it should something similar on yours, yoo.

BCM (Body Computer Module) ground and other electrical gremlins | FIAT Punto (Mk2/2b)

I just discovered the BCM grounding point on my Punto. The electrical system is very similar across most of the FIAT models, so this topic is not Punto exclusive. What happened I noticed idle dipping very short while engine was on warming up temp (40~70 ⁰C) and being stop at red lights. Dipping...

www.fiatforum.com

Thanks, I will replace the earth strap soon as it appears to be in bad condition.

How is the throttle body? Did you do a reset, parameters relearn?

I did a throttle relearn procedure following instructions from a scan machine and also did a reset with the scan tool and still no luck.

 

[Mike1alike]

Did you do this?

How to clean the potentiometer inside Throttle body

Hi Everybody. I would like to share my experience about the cleaning of the potentiometer inside of the Throttle body. I made this because I fight with bad idle after a big refurbishment and I thought I can try this as well. I had an other...

www.fiatforum.com

 

[Mike1alike]

What exactly is going wrong with your engine?
In the video posted here is not showing much wrong

BCM (Body Computer Module) ground and other electrical gremlins | FIAT Punto (Mk2/2b)

you could electrically disconnect the alternator and run it on battery alone for 1 minute, just to check if the voltage still fluctuates (some of the "new" alternators are actually rebuild ones).

www.fiatforum.com

Can you take a video with the RPM gauge when it runs bad?

What new alternator did you put? Is the charging system smart (ECU controlled) or fixed alternator, clasic? 13.8 V is kind of low for fix alternator.

 

[macpoland]

The tachometer is stuck.
In MES, you can see the RPMs jump from 670 to 730.
I installed the same one, 120A.
As for intelligent charging, I think I have it because I have the IBS sensor on the negative terminal.
I've disconnected it, but I don't see any changes.

 

[bugsymike]

The tachometer is stuck.
In MES, you can see the RPMs jump from 670 to 730.
I installed the same one, 120A.
As for intelligent charging, I think I have it because I have the IBS sensor on the negative terminal.
I've disconnected it, but I don't see any changes.

Check your other recent posting on BCM (groundposting etc.)?

 

[Mike1alike]

How is the timing? Did you check?