Thread: Methinks me MAF is buggered!

Originally Posted by OffTrack

Which makes buying OEM a no brainer.

I'm considering a new MAF, is OEM a considered as good as genuine? Anyone had a problem with OEM? Cheers, Bob

Originally Posted by bob10

I'm considering a new MAF, is OEM a considered as good as genuine? Anyone had a problem with OEM? Cheers, Bob

As long as you buy a VDO/Siemens OEM they are the same as genuine. Don't touch anything but LR or VDO/Siemens and you'll be fine.

Ralph,

I'd sort out the MAF first as that is obviously cactus.

That said the ECU is limiting due to excessive boost, if only for short bursts. Have you adjusted the wastegate at all?

When you have a fresh MAF installed try the same tests again and see if it's still limiting. If it is, I'd start by checking the small hoses around the modulator. I had one split and I initially thought I'd done the exhaust manifold due to the whistle. I doubt this has happened as the limiting was far worse - 4-5 seconds at a time.

cheers
Paul

Still in the process of obtaining another MAF, however....
I decided to bypass the wastegate modulator and I believe it is faulty as well. The attached file is a longer flatter run with the modulator bypassed and MAF disconnected. I would say that it is running as well as I have ever had it run. Of course there was not much load but the signs are encouraging as it did not surge or overboost once.

However, when I took the air intake hose off my mood changed. There was sandy grit coating the inside walls of the intake hose. (Makes sense as the filter had blown through and we have done sand driving).
A quick look at the turbo intake vanes and some slight grittiness around the throat there too!

Worst of all, I detected a slight but definate movement of the shaft when I tried to wobble it with my fingers. Enough movement to actually concern me.

So, the list now includes a MAF (was replaced in 2010), wastegate modulator and maybe (price permitting) a turbo charger.
Reckon I should look at a snorkle as well to keep the intake above water and sand.

Grrr.

Cheers
Ralph

Originally Posted by Ralph1Malph

Still in the process of obtaining another MAF, however....
I decided to bypass the wastegate modulator and I believe it is faulty as well. The attached file is a longer flatter run with the modulator bypassed and MAF disconnected. I would say that it is running as well as I have ever had it run. Of course there was not much load but the signs are encouraging as it did not surge or overboost once.

However, when I took the air intake hose off my mood changed. There was sandy grit coating the inside walls of the intake hose. (Makes sense as the filter had blown through and we have done sand driving).
A quick look at the turbo intake vanes and some slight grittiness around the throat there too!

Worst of all, I detected a slight but definate movement of the shaft when I tried to wobble it with my fingers. Enough movement to actually concern me.

So, the list now includes a MAF (was replaced in 2010), wastegate modulator and maybe (price permitting) a turbo charger.
Reckon I should look at a snorkle as well to keep the intake above water and sand.

Grrr.

Cheers
Ralph

You need to remember that the turbo has a plain bearing. Without oil pressure there will be some slop - no one is able to state how much exactly is acceptable but some movement is normal. If it the vanes aren't touching the housing when you move it I don't think you have too much to worry about. Your modulator is a bigger concern

cheers
Paul