MAF sensor

badger7 · 14-01-2008, 15:16

Hi everyone, I am new to this site and this is my first posting. I drive an Octavia 1.9 tdi and it would seem that there is a problem with the MAF sensor. After reading several threads on this subject I tried disconnecting it. I drove from London to Lancashire with it disconnected and the Car performed much better. The car still lacked guts however and when on a steady uphill slope cannot seem to get much power and won't go much past 85 mph even with foot to the floor. I plan to replace the MAF but would be interested to hear if there might be another fault aswell or will performance improve with a new sensor? Also, can anyone tell me the purpose of the MAF sensor? If the car runs fine with it disconnected then why not just leave it disconnected? Any help will be much appreciated as I do that journey 3 times a month. Cheers all.

fatty5000 · 14-01-2008, 16:04

MAF = Metered Air Flow unit Basiclly it measures th air flow into your engine which in turn allows the ecu to to put in the right amount of fuel for the mixture. The reason why the car runs better with it disconnected when faulty is because the ecu has a set of measurements built in so it kind of knows how much fuel with however many revs (if you get me).
You can't leave it uplugged as it will throw a fault code and you mpg will drop as the ecu is really just guessing how much air and therefore fuel you need.

Hope this makes sense and helps you

cjb · 14-01-2008, 16:12

The car will perform badly with the MAF unplugged, but if it's better than with it plugged in, replace it.

Taxi 219 · 15-01-2008, 05:21

As above yes replace the MAF sensor.Might also be worth checking your Air filter too.

badger7 · 15-01-2008, 11:30

Thanks a lot guys. Obviously will have to replace the MAF.
Cheers again.

RobClubley · 16-01-2008, 00:38

Check your hoses too and look for splits or hoses that have come loose.
I assume a diesel turbo will behave in a similar fashion to a petrol turbo if there's a boost leak.

14-01-2008, 15:16	#1
badger7 Briskodian Join Date: Dec 2007 Posts: 3 Thanks: 3 Thanked 0 Times in 0 Posts	MAF sensor Hi everyone, I am new to this site and this is my first posting. I drive an Octavia 1.9 tdi and it would seem that there is a problem with the MAF sensor. After reading several threads on this subject I tried disconnecting it. I drove from London to Lancashire with it disconnected and the Car performed much better. The car still lacked guts however and when on a steady uphill slope cannot seem to get much power and won't go much past 85 mph even with foot to the floor. I plan to replace the MAF but would be interested to hear if there might be another fault aswell or will performance improve with a new sensor? Also, can anyone tell me the purpose of the MAF sensor? If the car runs fine with it disconnected then why not just leave it disconnected? Any help will be much appreciated as I do that journey 3 times a month. Cheers all.

14-01-2008, 16:04	#2
fatty5000 Why So Serious Join Date: Jan 2006 Location: "What" ...What ain't no god damn country Posts: 5,529 Thanks: 271 Thanked 199 Times in 180 Posts	Re: MAF sensor MAF = Metered Air Flow unit Basiclly it measures th air flow into your engine which in turn allows the ecu to to put in the right amount of fuel for the mixture. The reason why the car runs better with it disconnected when faulty is because the ecu has a set of measurements built in so it kind of knows how much fuel with however many revs (if you get me). You can't leave it uplugged as it will throw a fault code and you mpg will drop as the ecu is really just guessing how much air and therefore fuel you need. Hope this makes sense and helps you __________________

14-01-2008, 16:12	#3
cjb Briskodian Join Date: Sep 2006 Location: Walsall Posts: 1,714 Thanks: 105 Thanked 111 Times in 107 Posts	Re: MAF sensor The car will perform badly with the MAF unplugged, but if it's better than with it plugged in, replace it. __________________ -- Chris ---------------------------------------------------- The Devil may care, but I don't mind.

15-01-2008, 05:21	#4
Taxi 219 Not anymore Join Date: Oct 2007 Location: Bournemouth Posts: 2,227 Thanks: 101 Thanked 108 Times in 105 Posts	Re: MAF sensor As above yes replace the MAF sensor.Might also be worth checking your Air filter too. __________________ Car now: 56 Octavia MK2 1.9TDi Ambiente-Debadged-Metallic Flamenco Red DMF Reqiured soon Previous: 06 Octavia Mk1 1.9TDi Classic with + pack-Diamond Silver Sadly missed: 97 Nissan Primera 2.0TDi SLX- Red Paul I only live for GTA IV

15-01-2008, 11:30	#5
badger7 Briskodian Join Date: Dec 2007 Posts: 3 Thanks: 3 Thanked 0 Times in 0 Posts	Re: MAF sensor Thanks a lot guys. Obviously will have to replace the MAF. Cheers again.

16-01-2008, 00:38	#6
RobClubley Ta moko! Join Date: Jun 2004 Location: Aotearoa - land of the long white cloud Posts: 6,904 Thanks: 149 Thanked 155 Times in 129 Posts	Re: MAF sensor Check your hoses too and look for splits or hoses that have come loose. I assume a diesel turbo will behave in a similar fashion to a petrol turbo if there's a boost leak. __________________ Corrida Red 2004 Octavia vRS Estate - It's the bestest Skoda in New Zealand! Whaia te mātauranga, whaia te māramatanga - Pursue knowledge, pursue the wisdom of knowledge www.pimpmyskoda.co.uk www.clubley.org Facebook

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