Intake air temperature sensor

Hi.
If the car (Golf 4 1J, 1.4 16V) ...
When the engine is completely cooled down, the intake air temperature sensor displays a reading that is 12 degrees lower than the outside temperature.
G42 from memory...
Where is he sitting?
Or is that the MAP sensor on the cylinder head?
I thought it only measured the vacuum pressure.
Best regards, Frank.

I will check if there is an original part inside and if there might be a connection problem.
However, if the engine control unit receives a temperature reading that is 12 degrees too low, it will enrich the fuel mixture and consume slightly more fuel.
It's not available at Daparto or KfzTeile 24.
I'll ask my mechanic and my parts supplier how much it costs, then I can almost calculate whether it's worth it to swap it out.

Best regards, Frank.

GRMBL, this thing actually has a gasoline engine. I've moved it to the appropriate category. Yes, it might then run faster, depending on how the measurement is factored in.
Regarding the air mass measurement, the intake air temperature is no longer needed, and the lambda control system is still in place.
You could take a look at their correction factors in the engine control unit.

Unfortunately, my previous posts referred to a different type of engine. I've deleted them.
There are also boost pressure sensors with temperature sensors; you need to check what is installed in your vehicle.

Best regards, Rainer.

I went to the doctor today.
He doesn't have a LMM.
The temperature will be determined using the MAP sensor (G42), which also measures the pressure in the intake system.
Well, as they say, you get what you pay for.
I replaced this sensor last year, and the power consumption already decreased.
The question now is whether it's worth exchanging it for 80 euros.
Will the consumption be higher than it should be because of the 12 degrees Celsius that it is measuring incorrectly?
But before I exchange it, I'm going to take it to the TÜV (German technical inspection agency) first, just to avoid any surprises.
Best regards, Frank.

Ah, okay, thanks for the feedback!

You can estimate the potential Sprite savings by checking the correction factors of the lambda control system.
If the amount of air available in the engine does not correspond to reality, the fuel injection system will deliver more or less fuel accordingly.
The lambda sensor measures the actual conditions, and the engine control unit adjusts the correction factors accordingly.
Okay, I'm ready. Please provide the German text you want me to translate.

Best regards, Rainer.

Okay, thank you.
I'll take a look at that sometime this week, but first, I need to get it to the TÜV (technical inspection).
Best regards, Frank.

Good morning.
Okay, the TÜV inspection is sorted out.

The lambda correction factors for Bank 1 are consistently and stubbornly displaying a value of 0.000 in the log file and cannot be changed, even with full throttle or idle.
Is that possible?
Best regards, Frank.

F B wrote:

Good morning. Okay, the TÜV inspection is sorted out. The lambda correction factors for Bank 1 are consistently and stubbornly displaying a value of 0.000 in the log file and cannot be changed, even with full throttle or idle. Is that possible? Best regards, Frank

Hm? I was expecting slight deviations. Did the log accidentally get "converted" (corrupted)? Is it a faulty measurement? Reading the values while idling is sufficient.

Best regards, Rainer.

No, all the other values are fine.
It appears that the 'correction factors for lambda control, bank 1' do not contain the correct values.
But according to the extended measurements, I still only have a three-cylinder engine.

I'll take a closer look at this and also consider the values next to it.
Best regards, Frank.