Mass airflow value at idlefor a 2006 Audi A4 2.0T

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buster1

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Does anyone know what the base mass airflow would be at idle for the above vehicle 2006 B7 2 L turbo automatic
 
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Uwe

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Checking a MAF at idle is, IMO, of little value. It varies too much based on engine temperature and parasitic loads. If you're trying to diagnose a possible bad MAF, log it trough a full-throttle run in 2nd or 3rd gear.

-Uwe-
 
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buster1

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So I did the log with the second gear and third gear pull the map seems to be responding fairly linearly I am having random nights too serious misfires under load around 3000 RPM and sometimes at and sitting for a minute or so the car will stumble quite a bit on initial load acceleration from stop not bad enough to set the check engine light but it does flash and it’s on cylinders one and four I have replace the coils any thoughts would be appreciated , Fuel pressure and duty cycle seems to be good .Long-term fuel trim is up around 13 1/2 so it’s Rich for some reason
 
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buster1

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Maf Seems linear and the random misfires are not too serious
 
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Uwe

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What's the peak value you got from the MAF log?

-Uwe-
 
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buster1

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Looks like around 270 g/s in second gear it shifts and a little bit less third
 
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buster1

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If I could take a snapshot of the screen and put it on here I would
 
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buster1

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Sorry that should’ve been 170 g/s not 270
 
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Uwe

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buster1

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It has a eurodyne stage one tune So 18 or so pounds of boost . I cleaned up the maf gently as best as I could with compressed air and now my long term fuel trim is down to around nine , I am living in the UAE and I ship the car over here I don’t know if the heat might have anything to do with it but it was fine until about a month ago when it started acting up I’ve been chasing it for a while not really convenient to get to a car dealer here I do have vag com , I wish it would throw a hard code but it’s not
 
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Uwe

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Yeah 170 is low for a tune that increases boost.

-Uwe-
 
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buster1

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Yeah 170 is low for a tune that increases boost.

-Uwe-

So I replaced the spark plugs and the misfire is gone car is running great again but I think I should replace the mass air sensor as well
 
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