As per my other thread dealing with my cold start issue.

 

Having unplugged the MAF, shouldn't my revs change?

 

Nothing happened when I do so, check the video and you'll see.

 

Does it sound like my MAF is gone?

 

(my handheld scanner hasn't shown up any current or pending faults)

 

Wen i unplug mine the revs dont change Its brand new so it should be ok

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Wen i unplug mine the revs dont change Its brand new so it should be ok

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Thanks. I was told that the revs should change up and down quite a bit. So chances are my MAF is ok then?

 

I haven't got any warning lights or any faults found on my OBDII scanner, just cold start hesitation.

Engine note should change when you unplug the maf. If it doesnt chances are it's goosed.

Just waiting for a vid of mine to upload mate.

I always had it the other way around, if the MAF is not reading right the rev's getting a bit wobbly, unplugging it reverts to a set pattern of air flow which allows it to run in limp mode.

Octy vrs maf unplug: http://youtu.be/zsDqBDKr7qY

This is mine mate. Maf is about 3 months old.

You can just about hear the engine note change, more so when its plugged back in.

when i unplug mine revs change and like previous poster said it wobbles a bit , also asr light comes on.

Tony that video is private, so we can't see it.

 

When I plug mine out neither the engine note or revs change.

Octy vrs maf unplug: http://youtu.be/zsDqBDKr7qY

Any better?

Cheers Tony, that video works now.

 

Yeah I can just hear it change a bit when unplugged/plugged back in again. But your revs don't change like mine.

 

My engine note does not alter at all. I've done this while cold and warmed up and the same.

 

Lovely shiny engine bay Tony by the way : )

Where abouts are you? Anyone you can change with local?

Cheers :-)

Where abouts are you? Anyone you can change with local?

 

I'm in Rep Of Ireland, I think there may still be a member near me. Michael1, he also has a mk1 vRS.

 

Must check actually.

I think the proof would be in the driving surely? Theres no load on the engine at idle.

I think the proof would be in the driving surely? Theres no load on the engine at idle.

 

 

It drives fine, pulls fine throughout all the revs.

Edited 21 September, 201411 yr by Col200sx

if your ever in dublin or wicklow , you can try mine for size.   (maf that is) 

Cheers lanciadub : )

 

So I got round to cleaning out my MAF, replaced it and while I still got that initial cold first start, it did feel quicker and a crisper acceleration.

 

I got a loan of a Vgate Scanner from a friend, what that did bring up was:

 

16486 P0102 MAF sensor G70 signal too low.

 

Also looking at the MAF, it was a Bosch 0 280 218 063 (06A 906 461L). Is this the correct one from factory?

 

Interestingly, while the revs didn't fluctuate before, once cleaned the MAF and unplugged there was a distinct change of revs, and my traction control light came on too.

 

I can get one from Skoda here in Galway for €157 provided I give back my old MAF.

 

Would this latest point towards a f.cuk.ed MAF?

Edited 8 October, 201411 yr by Col200sx

You will of got that code on the scanner because you unplugged the maf for the purpose of your video lol. And yeah if you try driving with maf unplugged the ASR light will come on along with the EML

Well on the plus side, I got a genuine Bosch MAF ordered from mister-auto.ie for €125 delivered. Cheapest I could find.

 

Due for delivery midway through next week, so will post up after fitting.

A late update, but the MAF took nearly two weeks to arrive.

 

So I changed out the old MAF for a new one, and guess what...... Still the same.

 

So it shows that my original one was fine.

 

On further inspection, I found the y-pipe (crankcase breather pipe?) on top and side of block had a major split in it.

 

I patched this up with duct tape as a temp solution, but still the same.

 

Having scanned it again, I'm still getting a:

 

17705 Pressure drop between turbo and throttle valve P1297 (check dv)

 

I've picked up a fuel filter which will be fitted today, as I haven't found any documentation to show it's been done.

 

Lets see what that does.

Your problem comes from the standard dump valve. Try to clean it with lots of isopropil alcohol.

That did the trick for me. Also check for any remaining split pipes.

Your problem comes from the standard dump valve. Try to clean it with lots of isopropil alcohol.

That did the trick for me. Also check for any remaining split pipes.

 

Cheers, haven't gone near the dump valve yet, will have a look and see what I can do.

Cheers, haven't gone near the dump valve yet, will have a look and see what I can do.

 

Typically when a MAF fails , unplugging it actually makes car run better.

 

The error you have now 

 

17705 Pressure drop between turbo and throttle valve P1297 (check dv)

 

Could be either:

DV

N75 Valve

Boost leak / split hose

 

Old DV should not be cleaned with anything but thrown in the bin.

 

The new style OEM DV has a better diaphragm and stronger made. It is the best leak free DV available, so i would recommended getting new one if you have never replaced it. 

 

These cars are getting on a bit now so converting hoses and pipes over to silicon or getting oem is worthwhile.