Poor Tdi Performance

[bus_boy]

Hi all - new to the forum (and Galaxy ownership!) - thought I'd post details of an early fault, now hopefully solved, on my 2000 1.9 Galaxy.

 

The vehicle displayed all the usual problems such as poor pick-up and sulking on hills. I disconected the MAF - but no real change was evident. I also inspected the vacuum pipe - that looked poor but no holes. The air filter looked good, perhaps too good. But when i looked closely at the air filter cover I found a huge gap running 3/4 of the diam on the bit where the round pipe (upwind of the MAF) meets the cover. It appears that the 'plastic weld' had failed, and at it's widest was 3mm open at the top. To repair it I simply wired it shut with garden wire and applied a coat of Araldite! [Will post a picture when I get hold of digi camera].

 

After the repair the car was much much better.

 

Has anyone else experienced this one? Anyone know how much a new air filter cover costs?

 

Cheers

[NikpV]

have you tried uplugging the maf since - might be worth it given the age of the car, quite a few posts recently seem to be implying that while not failing the maf loses part of its range/sensitivity around 50k miles - you never know you might get a further improvement.

 

I wonder why it would make such a difference between the air filter and maf ? Mind you I expect unfiltered air may not have done the maf a lot of good

[mumof4]

have you tried uplugging the maf since - might be worth it given the age of the car, quite a few posts recently seem to be implying that while not failing the maf loses part of its range/sensitivity around 50k miles - you never know you might get a further improvement.

 

I wonder why it would make such a difference between the air filter and maf ? Mind you I expect unfiltered air may not have done the maf a lot of good

 

 

Your right there nik, thinking back, ours had done 51k when ours went!!i would agree to trying to see what it was like if you unplugged the maf again..remember..if no difference..maf is naffed..!! :D

[bus_boy]

I susepct you might both be right (thanks for the replies by the way!)

 

I will try it.

 

The car has 75K on the clock and the current MAF is marked up as a VW one - does this mean anything?

 

Also some 'mechanic' has manged to break a small section off of the connector (both inside and out!) and the wire clip is no longer present. He (?) obviously lacked opposing thumbs!

[bus_boy]

Photos as promised. 1/3

 

1 - Here a picture of the crack (now repaired!) in the air filter cover spout. [Ford have quoted me

[NikpV]

..and finally here is an interseting observation.. (apart from missing the wire clip on the connector) if I leave MAF disconnected then car is runs poorly.... but if I reconnect it, it improves again! In fact it is better for the next 3 drives (or so) before going bad again later. The wife now unplugs and replugs it before each journey to ensure that it works

 

 

umm a maf that can count :D :D

 

I know there is one spare/unconnected wire in that connector assume its the one thats missing but cant think of a circumstance which would make the maf run ok for a couple of times and then need unplugging before it worked properly again. Possibly some sort of capacitance effect - but I would assume that any charge would leak away over time. Would unplugging it reset something in the ecu so it went into some type of learning mode ? A puzzle - let us know how the new maf changes things.

[Masked Marauder]

They are the wrong screws holding the sensor into the MAF so it is likely it has been a problem and been tampered with to try to repair it!

[NikpV]

wonder if the broken connector is also part of this 'repair' since its covered with a shroud I cant think of a way of breaking the connector but not the shroud :D

[Masked Marauder]

It looks like the cartridge has been changed. Perhaps for the wrong one then bodged?

[NikpV]

It looks like the cartridge has been changed. Perhaps for the wrong one then bodged?

 

 

 

ah connector mutilated to fit - makes sense :D

 

 

umm bus_boy did you get the number off the existing cartridge :D or look up the corrct type for ordering :D

[bus_boy]

I've ordered myself a TIS DVD so hopefully that will shed some light on it. Do you know if any of the connectors are direct earth?

 

Masked-M - The screws are still Torx ones, but they look a bit too rusty to have been on this car. I suspect someone has swapped in a 2nd hand one from another car and used those screws.

 

The connections under the shroud look fine... not as if someone has re-crimped them using a pair of pliers.

 

..I took the number off of the exisiting one :D

 

VAG: 028 906 461

[Masked Marauder]

That is the right number for a MAF, but not for a year 2000 model. Unfortunately without searching through the whole parts catalogue I can't tell you what it is actually for..... But I can tell you that it costs

[bus_boy]

Here is the eBay listing...

 

http://cgi.ebay.co.uk/NEW-Air-mass-flow-me...1QQcmdZViewItem

 

According to his 'Pierburg' chart it will do......

 

SEAT ALHAMBRA (7V8, 7V9) 1.9 TDI 08.96-06.00

SEAT ALHAMBRA (7V8, 7V9) 1.9 TDI 06.00-

 

and

 

VW SHARAN (7M8, 7M9) 1.9 TDI 09.95-

VW SHARAN (7M8, 7M9) 1.9 TDI 09.96-04.00

VW SHARAN (7M8, 7M9) 1.9 TDI 04.00-

 

I know there is no mention of Galaxy here - so I have made an assumption! What month in 2000 did the Galaxy change? Mine was registered in October.

 

[in the above I assume the 3 digit alpha-num is the engine model number?]

 

It should get here any day now, so I guess I'm going to find out one way or another :D

[Masked Marauder]

7M8 is a MK1 Sharan, 7M9 is a MK2

 

7V8 is a MK1 Bammer, 7V9 a MK2.

 

The engine designation is something like AFN ANU

[bus_boy]

Thanks MM - here is just a quick update.

 

Fitted new MAF, and went for a test drive. Performance below 2000rpm still not what I could hope for - but above this now fantastic!! I have lopped about 6 seconds off of the 0-60 time, and the turbo really goes for it now.

 

MPG was running at 40/gal - will monitor next fill.

 

 

....looks as if it was the MAF all along ;)

[NikpV]

Fitted new MAF, and went for a test drive. Performance below 2000rpm still not what I could hope for

 

glad its made a difference - did you get the correct maf in the end ? - wonder if you didn't it may affect performance across part of the range e.g below 2000rpm??