[vantaam5]

I would add a fuel filter to the maintenance list to. Low MAF test is low air or low fuel. Mileage is low but years are long.

It is not only about air or fuel.....

The so-called "MAF-test" is a calculated combination of many other factors as well.Like Vanos(CPS,Solenoids,...),even cam timing plays a role....

Also lower octane fuel plays a role due to re tarded ignition timing...

 

[vantaam5]

I was wondering because... Thanks! of coarse intake valves control how much air too. CPS say how long to do A or B. I will also add exhaust valves and NOx emissions.
How much of an allowance could we give those things? Would 20% be too much?

No idea how high the percentage of the Vanos is...

Also exhaust side has impact on the flow(overlap)....

Also cat performance has an impact....if they are old and clogged,too high back pressure,less cylinder filling,lower performance...

I could go on with loads of other things....

 

[vantaam5]

My point is just that MAFs can help,but the rest basic maintenance(means CPS,fuel filter,solenoid O-rings) should also be done...

But this is the reason I changed EVERY sensor and replaced/rebuilt EVERY actuator on my engine(even use 2 new solenoid boards in my mental illness...:grinyes