MJI
Well-Known Member
The brief answer is "Worse performance, worse fuel consumption".
I think to be sure about the MAF you may well need diagnostics. I changed mine a couple of years ago, for one that wasn't cheap and once on it made no difference. this was long before I had diagnostics and I just thought it was me being silly and that the new one must be working. But when I went to a garage for diagnostics on another matter, they told me the Maf was naff. It was then changed for a hugely expensive one but the difference was obvious both in the driving experience and fuel consumption.
It is said that if your MAF is up the spout you can disconnect it and see if there is a difference, as then the ECU sets a map running on average readings, like when the electric company bill you on an "estimated reading". but now I have my diagnostics it tells me when the Maf is wrong.
Mine appears to read high, not sure if this is a sign of failure or not