Thread: TD5 MAF FAILED AND NOW IT RUNS BETTER??? WTF

So, after a little over zealous cleaning, I managed to break one of the heater wires on the MAF on Bonnie on the weekend.

I know a lot of people state that a failed MAF makes it run worse but I'm finding it completely the opposite. Its still plugged in but Nanocom reads the zero flow of 4.3 constantly.

As I have a TD5Alive stage 2 remap the biggest changes noticed is the lack of torque limiting for the slushbox, better spool up particularly in 4th from 80k's when the converter locks, only 1/3 of the usual pedal is needed to wind it up and it hits the boost cut consistently with ease albeit a little more harsh and the general shifts are actually smoother and more precise.

I've ordered a new VDO MAF from Paddocks but actually thinking about not fitting it now.

There was nothing wrong with the sensor to start with, I just gave it a clean and broke it sticking the sensor cleaner nozzle in a little to gung-ho.

The MAF controls the load sensing in conjunction with the throttle position. In TD5 autos, this modifies the fuel map curve to limit the torque input into the box, this is why all TD5 autos feel doughy around 2700rpm stall speed.
No MAF input allows the fuel map to run it's upper curve as it's not sensing a high air consumption.

It also controls the shift valving, under hard acceleration it delays the up shift speed and limits the injection at the point of shift to reduce any shock loading thru the trans.

At the moment it's like it almost has full converter lockup in all gears.

Pretty lively for nearly 2.5 tonnes.