Yeah it can be surprising how dependent the ECUs are on the MAF for things to work properly. It doesn't always log a fault code either - mine had a lumpy idle because of the MAF giving bad data but it was quite tricky to track down because at a glance the figures looked plausible. In the end, turning off the O2 sensors and forcing it to run open-loop proved the point. Interestingly, unplugging it and triggering a code will cause it to ignore the MAP until the code is cleared, even if it's plugged back in.
Changing the MAF to cure bad shifting was a trick amongst Audi master techs back in the days when D2s were still going through the dealerships.
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24th January 2017, 08:29 AM
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