Wobby Posted July 15, 2005 Report Share Posted July 15, 2005 Hi, Just wondering what sort of percentage of PD TDI owners have had MAF problems. There seems a lot of posted problems that a new MAF sorts out! Thanks for taking part RobK Link to comment Share on other sites More sharing options...
Wobby Posted July 15, 2005 Author Report Share Posted July 15, 2005 TIAN!!!! You cant vote, its VW only Anyway i doubt if Volvos even have a MAF, i mean, they dont even have an off switch for the side lights RobK Link to comment Share on other sites More sharing options...
Mook Posted July 18, 2005 Report Share Posted July 18, 2005 VW generally recognise that there are problems with all MAFs across their range, which is why they will replace it no questions asked as long as the car is within warranty and has not been modified (i.e. alternative air filter like K&N). It's a problem that's not going to go away which is why I carry a spare for that time at 4am on a Sunday when you are on a road in the middle of nowhere and the nearest stealer doesn't open until after the bank holiday monday... Link to comment Share on other sites More sharing options...
ocrp Posted July 19, 2005 Report Share Posted July 19, 2005 Speaking of replacing MAF's, if I replace it myself (i.e not done by the dealer) do I need to clear any fault codes in VAG-COM? Link to comment Share on other sites More sharing options...
Mook Posted July 19, 2005 Report Share Posted July 19, 2005 According to VW you need to do a reset, otherwise the ECU is compensating for a knackered MAF. Link to comment Share on other sites More sharing options...
Wobby Posted July 19, 2005 Author Report Share Posted July 19, 2005 i never knew that!! Will it have an error log now then? I will look when i get a minute. Mine improved without being reset. Link to comment Share on other sites More sharing options...
Mook Posted July 21, 2005 Report Share Posted July 21, 2005 If there was a problem with the MAF that the ECU recorded, it will show an error, just clear it and reset. HTH Link to comment Share on other sites More sharing options...
Rustynuts Posted July 21, 2005 Report Share Posted July 21, 2005 Only a total failure and setting of a fault code will need resetting. Many mafs fail to the point that the owner knows something is wrong and the dealer denies it 'cos "There's no fault code showing on the diagnostics computer!" However, changing the maf for a known good one restores the lost power, and no reset is necessary. Link to comment Share on other sites More sharing options...
Wobby Posted July 21, 2005 Author Report Share Posted July 21, 2005 [ QUOTE ] According to VW you need to do a reset, otherwise the ECU is compensating for a knackered MAF. [/ QUOTE ] If the ECU was compensating for a knackered MAF then it would have to have some how stored the previous MAFs data!! I didn't think it worked like that? I thought it just took an instant reading at the moment it was doing the calculation for fuel? I will be changing my MAF in the near future. RobK Link to comment Share on other sites More sharing options...
Tobes49 Posted July 21, 2005 Report Share Posted July 21, 2005 The MAF problems stems back to a 5 pin bosch part where the pins are all inline! This is fitted to Vauxhall, Mercs and many other cars that fit bosch parts. It not just VW that have the problem but all makes that fit them. Link to comment Share on other sites More sharing options...
Tobes49 Posted July 21, 2005 Report Share Posted July 21, 2005 [ QUOTE ] TIAN!!!! You cant vote, its VW only Anyway i doubt if Volvos even have a MAF, i mean, they dont even have an off switch for the side lights RobK [/ QUOTE ] Be careful what you say What engine did they use in a lot of Volve diesels? The good old audi 5 cylinder tdi lump! Link to comment Share on other sites More sharing options...
Wobby Posted July 22, 2005 Author Report Share Posted July 22, 2005 But Tians is a petrol, so he cant vote!! He can if he wants really. I have just done some MAF readings on a Skoda Fabia VRS, its 130 PD TDI with 6k on it. Its maximum MAF reading was around 850 with one strange reading up to 975. When i tested mine (Passat PD 130 with 140k) it had regular readings of 1200. Why the differance? Does anybody know whats normal on VAG COM? I cleaned my MAF and my reduced MPG returned to normal, but after 2 days it back low on the MPG. I had a journey with the MAF unplugged and it drives rubbish with no power. When i checked the engine module i had a MAF fault logged (expected). What i didn't expect was to reset it, have a drive and find it back with the same fault!! Going to exchange MAFS when i get a chance. RobK Link to comment Share on other sites More sharing options...
corbeau Posted July 26, 2005 Report Share Posted July 26, 2005 It is actually my second Golf GT Tdi and YES, it happened to me twice! Link to comment Share on other sites More sharing options...
ocrp Posted July 27, 2005 Report Share Posted July 27, 2005 Wobby, What is the fault code that shows on VAG COM for a faulty MAF. Link to comment Share on other sites More sharing options...
makaronac Posted July 28, 2005 Report Share Posted July 28, 2005 My experience was totaly diferent.It seems to me that I had a problem with MAF (Passat tdi pd 85kw).Wrong!!! I spent a lot of days to find a reasons why my passat have a problem with a power.Reason was so trivial-el cable on 1'st valve was cut!!!Next problem is that I had to replace it (need to open the engine cover becouse the cable goes throght the engine).After that my passat flying. Just for the information: MAF is the part which it has to be replaced on 100000km. VW made it only for replacing (not to clean it or something else). Best regards to all of you. PS Sorry, my English isn't so god. Link to comment Share on other sites More sharing options...
Wobby Posted August 5, 2005 Author Report Share Posted August 5, 2005 IS there a specified milage to replace a MAF? Never seen there was. Anybody? RobK Link to comment Share on other sites More sharing options...
Mook Posted August 5, 2005 Report Share Posted August 5, 2005 [ QUOTE ] IS there a specified milage to replace a MAF? Never seen there was. Anybody? RobK [/ QUOTE ] No there's not, because it is an electronic device. If the car's under warranty it will be a no cost replacement. If not, it is about £70 plus fitting, unless you do it yourself - it's a 10 minute job. Link to comment Share on other sites More sharing options...
Wobby Posted August 5, 2005 Author Report Share Posted August 5, 2005 [ QUOTE ] MAF is the part which it has to be replaced on 100000km. [/ QUOTE ] Sorry, post aimed at this quote, seemed to suggest its recommended at 100,000km? RobK Link to comment Share on other sites More sharing options...
mulkbear Posted August 6, 2005 Report Share Posted August 6, 2005 [ QUOTE ] According to VW you need to do a reset, otherwise the ECU is compensating for a knackered MAF. [/ QUOTE ] Bullshite Which dealer that told you that! I bet it was "Corkkills VW" they area very poor dealer (bottom 20 for customer satifation) Link to comment Share on other sites More sharing options...
ocrp Posted August 8, 2005 Report Share Posted August 8, 2005 [ QUOTE ] [ QUOTE ] According to VW you need to do a reset, otherwise the ECU is compensating for a knackered MAF. [/ QUOTE ] Bullshite Which dealer that told you that! I bet it was "Corkkills VW" they area very poor dealer (bottom 20 for customer satifation) [/ QUOTE ] So, in summary, if you dont do a reset with a new MAF installed, which values will the ECU use? Link to comment Share on other sites More sharing options...
Rustynuts Posted August 8, 2005 Report Share Posted August 8, 2005 The ECU always relies on what the maf tells it, whether it's right or wrong. If there's no maf to read from (disconnected) it then reverts to it's guesstimate values. When you change a failed maf, it reads correctly without a reset, but if it set a fault code when it failed, this will still be in the ECU memory, and will need clearing at some point. This does not affect the reading between the ecu and the maf, it's merely an indicator that there has been (or still is) a fault, which may prompt the dealers to replace and charge you for a new maf again next time they service your car. Link to comment Share on other sites More sharing options...
Mook Posted August 8, 2005 Report Share Posted August 8, 2005 Thanks for an informative post Rusty. Surely that means that Mulkbear's very mature response is not right? Don't worry about it - from previous posts he'd made, I won't be going near any VW dealers in the Newcastle area, in case he's working at one of them. Link to comment Share on other sites More sharing options...
Wobby Posted August 8, 2005 Author Report Share Posted August 8, 2005 He is an example for why not to take your car to the dealers!!! But he does seem helpful as well on some of his posts (when hes got his grown up head on ) RobK Link to comment Share on other sites More sharing options...
Wobby Posted August 8, 2005 Author Report Share Posted August 8, 2005 [ QUOTE ] I bet it was "Corkkills VW" they area very poor dealer (bottom 20 for customer satifation) [/ QUOTE ] Wow!!! VW do customer satisfaction surveys !!! I bet they read well RobK Link to comment Share on other sites More sharing options...
mulkbear Posted August 8, 2005 Report Share Posted August 8, 2005 I am right because as the o'holy one when it comes to sooty's(rusty nuts ) [ QUOTE ] When you change a failed maf, it reads correctly without a reset, [/ QUOTE ] So there is no need to reset the fault memory, and no need to pay a stealer 1/2 hours labour for the fault memorys reset Link to comment Share on other sites More sharing options...
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