Is this a dirty / faulty MAF sensor?

Legojon

I only wanted a remap
Staff member
Moderator
Jul 7, 2015
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Sorry for the mess of a graph. I've circled the bit of interest. The grey line shows acceleration (2400-4300) in 2nd gear. I've been chasing a hesitation / jolt for ages now. It occurred this morning at around 3600 revs.

The other lines aren't to scale, I've just blown them up to show the pattern compared to the revs. Notice the MAF (dark blue line) drops off about 2 seconds before i finish accelerating and the turbo with it. Would that prove the MAF needs replacing or is something else going on?

Also, shouldn't the AFR spikes match up with the MAF spikes?

maf2_zpskgra6dqa.png
 
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