Maf question

[teeth2k]

How is the best way to tell if the maf is miss behaving?
1.9 TDI
I can start the car with it unplugged

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[Jay1601]

With VCDS look at actual VS specified figures on the MAF

 

[teeth2k]

With VCDS look at actual VS specified figures on the MAF

Ok thanks, you wouldn't know where to find the correct values ?


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[Jay1601]

Specified will be the figure the car is wanting to see but google might give you a rough idea on what it should be

 

[teeth2k]

Specified will be the figure the car is wanting to see but google might give you a rough idea on what it should be

Ok cheers

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[Marty_mc]

Ok thanks, you wouldn't know where to find the correct values ?


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When pulling from low rpm 1500 at full load in 3rd gear all the way to around 4K rev., the MAF should exceed the max. MAF spec in group 003. you're looking < 850mg/ str. The flow will drop off slightly as you reach peak power.

Might be worth looking on channels 10 and 11 to see what specific boost pressure you're getting too.

What are the symptoms that make you think your MAF is dead?

 

[teeth2k]

When pulling from low rpm 1500 at full load in 3rd gear all the way to around 4K rev., the MAF should exceed the max. MAF spec in group 003. you're looking < 850mg/ str. The flow will drop off slightly as you reach peak power.

Might be worth looking on channels 10 and 11 to see what specific boost pressure you're getting too.

What are the symptoms that make you think your MAF is dead?

The car wouldn't start, called out the breakdown chap who got it started with a can of lynx and said the glow plugs were at fault, took it to the garage and they said glow plugs were fine but the battery had had it, also said the maf was at fault, I had a new battery fitted and told them to leave the maf, scanned it on vcds and found a maf fault, removed it and cleaned it with some electronic cleaner, refitted, cleared the code and so far it hasn't come back, I often use the torque app and scan often for faults but unit the car wouldn't start never found a maf one.
So just wanted to check the value s


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[Marty_mc]

The car wouldn't start, called out the breakdown chap who got it started with a can of lynx and said the glow plugs were at fault, took it to the garage and they said glow plugs were fine but the battery had had it, also said the maf was at fault, I had a new battery fitted and told them to leave the maf, scanned it on vcds and found a maf fault, removed it and cleaned it with some electronic cleaner, refitted, cleared the code and so far it hasn't come back, I often use the torque app and scan often for faults but unit the car wouldn't start never found a maf one.
So just wanted to check the value s


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You don't mean to clean them at all.

Sound a bit suspicious to me. Most likely it has been caused by using the aerosol as a cold start when the intake was disconnected and the fault hasn't been cleared.

You can run it with MAF disconnected however, the value will default to > 750mg/str. so your power will be restricted.

Hope that clears things up.

 

[teeth2k]

Sorry to throw this back up, is vcds lite able to read the measuring blocks for the maf and the map.?