Methinks me MAF is buggered!

Hi Ralph

The only thing that stands out on first look is that your MAF sensor is dead, or alternatively there is a break in the wiring back to the ECU. The resistances you posted earlier support a dead sensor but a check of the wiring wouldn't hurt as it route it takes in front front of the engine goes past some hot real estate and over the years the insulation can get brittle and break away.

I haven't learnt enough about the the turbo side of the TD5 yet so I can't comment on the figures you highlighted. Otherwise the 3 temp fields look pretty normal to me. The EGR and wastegate data look pretty similar to what I log on my D2a.

Cheers

Steve

Quote:

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Originally Posted by OffTrack

Which makes buying OEM a no brainer.

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

Quote:

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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

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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!:mad:

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.:thumbsdown:

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

Quote:

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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!:mad:

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.:thumbsdown:

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

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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

Quote:

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Originally Posted by OffTrack

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

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Yes, I forgot about the bearing oil pressure;). The vanes are not hitting the housing so I'll leave it be.
Just gotta purchase a MAF and wastegate modulator.

I'll try one of the pommy online shops I reckon:D.

Cheers
Ralph