super rich idle at random times

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rnagy86

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	super rich idle at random times « on: July 20, 2021, 12:30:04 PM »

Hi

My car has started to develop a super rich idle which happens out of the blue
when engaging the clutch or by leaving it to idle for some time.
Requested lambda is 1, there are no leaks, fuel pressure is correct, however it
still goes so rich that it can stall the engine. I am leaning towards a bad throttle
body which closes too much while fuel is injected for the airmass sucked in already.
I've attached a log that clearly shows the issue. Lambda control is trying to keep
it in check but fails as well. If i shut the engine down and restart it right away,
the issue goes away until some time. Does anyone have any idea?

Thanks!


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rnagy86

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	Re: super rich idle at random times « Reply #1 on: August 28, 2021, 06:09:29 AM »

Anyone?


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_nameless

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	Re: super rich idle at random times « Reply #2 on: August 28, 2021, 08:26:01 AM »

Quote from: rnagy86 on August 28, 2021, 06:09:29 AM

Anyone?

More info on the setup? huge injectors?


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rnagy86

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	Re: super rich idle at random times « Reply #3 on: August 28, 2021, 11:55:42 AM »

Nothing special really. 0 280 158 040 injectors at 4 bar base pressure. TVUB, KRKTE, TEMIN are perfectly fine. This really happens out of the blue on both banks, like the car idles fine for 10 minutes then you drive for 2 minutes and it starts doing it, the you restart the engine and all is good again. I am leaning towards some faulty hw like the TB acting up and closing by itself or something. MAF has also been replaced as I thought that is faulty.


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dmntr

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	Re: super rich idle at random times « Reply #4 on: April 18, 2025, 07:27:04 PM »

Quote from: rnagy86 on August 28, 2021, 11:55:42 AM

Did you solve the problem?


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rnagy86

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	Re: super rich idle at random times « Reply #5 on: April 20, 2025, 10:42:37 AM »

Quote from: dmntr on April 18, 2025, 07:27:04 PM

Did you solve the problem?

Yeah I am using an HPX MAF in a 059906461Q MAF housing which fits the RS4 airbox perfectly.
No issues anymore.


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