Is this a MAF problem?

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rnagy86

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	Is this a MAF problem? « on: May 08, 2012, 02:47:19 AM »

Hi

I've been having really bad idles lately and I tried to unplug the MAF which made the car idle fine, but I have no MAF related CELs at all and it seems when I have the MAF plugged in, I get correct values.
Can someone please have a look at these two VAG-COM logs and enlighten me? The Lambda Control values make me worry a bit (the o2 sensors are perfectly fine).

MAF: https://docs.google.com/spreadsheet/ccc?key=0AhrG40GHpr-hdGZPMXVwYmhBSnA2ZkN5RzZlV3NJcVE#gid=0
NOMAF: https://docs.google.com/spreadsheet/ccc?key=0AhrG40GHpr-hdDh5cFZWSHVSbmZUWUJfdXNiZ2h4cVE#gid=0

Thank you!


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professor

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	Re: Is this a MAF problem? « Reply #1 on: May 08, 2012, 05:57:45 AM »

My 1.8T 20V has oil evaporative valve, fume oil returns from oil filter to turbo intake hose, which often brokes off and idle is going crazy.
Perhaps something similar happens to you?


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Seat Ibiza MK4 Cupra 1.8t 20V, stg3.
"Those 1.8T 20V machines are really tough" ©

rnagy86

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	Re: Is this a MAF problem? « Reply #2 on: May 08, 2012, 08:45:17 AM »

Is that the valve that's called N80 on the s4 b5?


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rnagy86

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	Re: Is this a MAF problem? « Reply #3 on: May 08, 2012, 08:50:48 AM »

Actually I am not even sure that the European models have an EVAP valve.


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rnagy86

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	Re: Is this a MAF problem? « Reply #4 on: May 08, 2012, 08:57:37 AM »

And of course just to say again I have no CELs at all, just the strange logs and symptoms.


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rnagy86

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	Re: Is this a MAF problem? « Reply #5 on: May 08, 2012, 09:05:52 AM »

Ok it turns out that I have it, so I plugged in a factory M box ECU and it popped me a P1473 EVAP Leak Detection Pump: Open Circuit.
But I do not have this DTC with my C and D ECU. Maybe they don't support it?

Thanks


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rnagy86

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	Re: Is this a MAF problem? « Reply #6 on: May 08, 2012, 01:44:51 PM »

Anyone?


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