bighitter

hi guys,

following on from my recent thread of poor mpg, i today tested my car driving it with the air flow sensor connected and disconnected.
The car beahved pretty much the same. The car is quick with the MAF connected and is pretty much the same with it disconnected. Drove it up a very steep hill with it disconnected and it went like a rocket.
I read somewhere that with the MAF disconnected it should have the performance of a SDI but I can honestly say the car went wll in both situations.

Is the MAF faulty or what

Car was booked in at VW for poor MPG, came back with no fault found, could be driver style I was told. Told them even if I drive like a saint I dont get 260 miles, just told me to book it in again if it continues. WTF should I do? fuel is costing me a fortune.


Cheers

ScoobyChris

Is the car especially smokey?

Chris

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Holding up the traffic in a little Italian..........

bighitter

not any more smokey with it disconnected.
car drives and behaves fine.
mpg is however really low

teedeeye

That was me. I'd been doing some work in the engine bay and had forgotten to replace the MAF plug. Upon driving, it took about 5 seconds for me to realize my mistake - performance significantly reduced. Be aware that running with the plug disconnected will log a fault on the ECU.

We had a similar issue with our company VW LT35 TDI. The MAF had failed which resulted in high fuel consumption and very lack-lustre performance. I confirmed the diagnosis by unplugging the MAF which had zero affect on performance. Once I'd replaced the faulty MAF, both performance and economy were fully restored.

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Fabia 1.9TDI - PD100 - Elegance - petrol green - 2001 - Dragon PD tuning unit - 16" vRS alloys - K&N filter - PD160 intake - short shift mod - cage mod - Osram Silverstars - 144k miles and counting

auroan

Yup I'd agree. Had this problem with an old A4 110 TDI. Wether the MAF was plugged in or not it would't fully spinup the turbo. VAGCOM show'd a fault about airflow, so I swapped the unit out with a new one and everything went back to normal gutsy performance.

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'05 Audi A4 2.0 Tdi SE - no mods until the warrenty expires
'00 Audi A4 2.8 Quattro - Gone.... (bleeding money pit )
Audi A4 2.6 Avant (Breaking - Check out http://shop.ebay.co.uk/merchant/auroan)

Eire-Andy

could anyone point me towards a thread or even a picture of where the MAF is? or what it looks like?

I've had mine replaced already for a different fault and i think the new one was DOA. I would like to pull mine out and see how it goes, doing so for a long period of time wouldnt do any harm to the car would it?

its a 01 1.6i octavia mk1. any info would be greatly appreciated.

landsker

I bought, from eBay for £25 and fitted a generic MAF after my 1.9tdi slowed to a crawl.
I think that the output readings from this new MAF are such that they fool the ECU into thinking there's more air passing through than there is, as I have noticed two things. (1) A definite increase in performance and (2) A small decrease in MPG!
This is the new re-map for no money!

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Roger

I just LOVE my siesta!

auroan

Ah if it's a petrol 1.6 i'd be looking else where for the problem, MAFs have a much bigger affect or turbo charged cars than they would on an NA 1.6

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'05 Audi A4 2.0 Tdi SE - no mods until the warrenty expires
'00 Audi A4 2.8 Quattro - Gone.... (bleeding money pit )
Audi A4 2.6 Avant (Breaking - Check out http://shop.ebay.co.uk/merchant/auroan)

Zebra

Drinking diesel could be a result of a faulty EGR valve.

It happened to mine and it was very thirsty.