g-man85 Posted July 25, 2006 Report Share Posted July 25, 2006 Well I think my car is running in limp mode with a faulty MAF so i disconnected the MAF and the car ran the same.Basically I think its been under performing so is this a clear indicator for a faulty MAF? Quote Link to comment Share on other sites More sharing options...
nfbr Posted July 25, 2006 Report Share Posted July 25, 2006 no...It could be anything...N75 and N18 valves may also cause similar problems. Quote Link to comment Share on other sites More sharing options...
sleeky tdi Posted July 25, 2006 Report Share Posted July 25, 2006 Need to get it on the diagnostic matey, try and find someone local to you with vagcom, theres a list of users on seatenthusiasts. There is a test on tdiclub.com which uses vagcom to test the maf so id give that a go aswell as scanning for any faults.As Al said it could be anything, i had to have both the above mentioned valves replace to cure my issues.Lee. Quote Link to comment Share on other sites More sharing options...
g-man85 Posted July 25, 2006 Author Report Share Posted July 25, 2006 Well getting VAGCOM on Thurs morning so hopefully will found out then style="vertical-align:middle" emoid=":coffee:" border="0" alt="coffee.gif" /> Quote Link to comment Share on other sites More sharing options...
stevewp Posted July 26, 2006 Report Share Posted July 26, 2006 I had the MAF go on the Passat, but you really need to plug VAGCOM in to confirm it. Strangely, mine was so FUBAR'd that it actually ran better with the MAF disconnected! Lol.Don't know if the Lupo's the same, but I actually went for a MAF from a C-class Merc which was a better make and much much cheaper than VW's one. It's a straight swap. Just not sure that there'll be an alternative for the Lupo though. Quote Link to comment Share on other sites More sharing options...
Max69vk Posted July 26, 2006 Report Share Posted July 26, 2006 Definately check it on VAGCOM, I made the same mistake with my TDI & bought a new MAF only to find out it was actaully the N75 valve that ws faulty! (Got a working MAF here if it is faulty though). Quote Link to comment Share on other sites More sharing options...
Mike_M Posted July 26, 2006 Report Share Posted July 26, 2006 Disconnect the MAF and drive the car..............it should have no power if you try and floor it compared to before.If so then the N75 valve mate Quote Link to comment Share on other sites More sharing options...
Max69vk Posted July 26, 2006 Report Share Posted July 26, 2006 Not neccessarily, I disconnected mine & it didn't really make any difference + it was tested as being 100% ok. I dont think the MAF has as much of an effect on diesel engines as it would on a petrol engine. The only way to be sure is to get it on VAGCOM. Quote Link to comment Share on other sites More sharing options...
g-man85 Posted July 26, 2006 Author Report Share Posted July 26, 2006 Well when disconnected nothing happens really.But what about Pierburg units that from Mercedes that i keep hearing are more reliable? Is this true, if so can i have some part numbers and more details incase my MAF needs replacing.Cheers! Quote Link to comment Share on other sites More sharing options...
lupogtiboy Posted July 26, 2006 Report Share Posted July 26, 2006 usually when the MAF goes, there is a lack of power and the engine doesn't rev much over 3000 rpm. in the last year or so, the cost of MAF's have come right down! they retail around £88ish from vw Quote Link to comment Share on other sites More sharing options...
g-man85 Posted July 26, 2006 Author Report Share Posted July 26, 2006 usually when the MAF goes, there is a lack of power and the engine doesn't rev much over 3000 rpm. in the last year or so, the cost of MAF's have come right down! they retail around £88ish from vw£88 for a new one?? As its around £80 for an exchanged item style="vertical-align:middle" emoid=":o" border="0" alt="ohmy.gif" /> The engine still revs to 4800 rpm (diesel) but its slow........... style="vertical-align:middle" emoid=":angry:" border="0" alt="mad.gif" /> Quote Link to comment Share on other sites More sharing options...
lupogtiboy Posted July 26, 2006 Report Share Posted July 26, 2006 £88 for a new one?? As its around £80 for an exchanged item style="vertical-align:middle" emoid=":o" border="0" alt="ohmy.gif" /> The engine still revs to 4800 rpm (diesel) but its slow........... style="vertical-align:middle" emoid=":angry:" border="0" alt="mad.gif" />most are new units now rather than exchange ones! if the part number has an 'X' on the end of it, its an exchange unit. and yes, somewhere between £80-£90 for those! Quote Link to comment Share on other sites More sharing options...
g-man85 Posted July 26, 2006 Author Report Share Posted July 26, 2006 Wow! Thats not bad.I know what an N75 valve is but what is a N18 valve?? Quote Link to comment Share on other sites More sharing options...
stevewp Posted July 26, 2006 Report Share Posted July 26, 2006 Well when disconnected nothing happens really.But what about Pierburg units that from Mercedes that i keep hearing are more reliable? Is this true, if so can i have some part numbers and more details incase my MAF needs replacing.Cheers!It is true. VW used to use Pierburg but then went to Bosch (am I right there?) cos they were cheaper. And guess what - suddenly they start getting problems, which they won't admit to. Surprisingly enough, I believe they've now gone back to the Pierburg ones. However, I think you may struggle to get a Merc version of the Lupo one. Which is a shame, cos they're masses cheaper!! Quote Link to comment Share on other sites More sharing options...
g-man85 Posted July 26, 2006 Author Report Share Posted July 26, 2006 GermanFrenchSweedish have part number:18785B: AIR MASS METER-EXCHANGE @ £58 but for a 1.2 TDI-is this the same for a 1.4 TDI?but they also list18789C: AIR MASS SENSOR PROBE-PIERBURG REPLACEMENT FOR MOST BOSCH AIR MASS METERS @ £39So if my MAF is faulty, is it only the probe that is wrong, therefore could I simply just use the new Pierburg probe replacement in the Bosch housing, which will give me a cheaper and more reliable repair? style="vertical-align:middle" emoid=":(" border="0" alt="sad.gif" /> I thought the MAF was just a sensor probe in a plastic housing, or is there more??? style="vertical-align:middle" emoid=":confused:" border="0" alt="confused.gif" /> Quote Link to comment Share on other sites More sharing options...
stevewp Posted July 27, 2006 Report Share Posted July 27, 2006 It's often sold as the whole assembly (ie tube with the sensor mounted in it). On the Passat, the Pierburg is a slight interference fit (just the clip) but will basically go straight in. I changeed mine in the MB car park!And for those who think it makes little difference - before I changed Hannah's Lupo would pull away from me, even uphill, so I must have been down a good 20-30 hp I reckon. You can imagine the smile on my face when I changed it and was back to full power!! Quote Link to comment Share on other sites More sharing options...
g-man85 Posted July 27, 2006 Author Report Share Posted July 27, 2006 Well suprise suprise! My MAF is dodgey style="vertical-align:middle" emoid=":blush:" border="0" alt="blush.gif" /> So looks like a new one is on the way. Still not sure about the pierburg jobbies though, as the mechanic said they may not be set up for VW and may fluctuate to the Bosch ones Quote Link to comment Share on other sites More sharing options...
sleeky tdi Posted July 27, 2006 Report Share Posted July 27, 2006 Have you removed the maf just to check that it doesnt need cleaning? As that could save you some money style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" />http://www.maplin.co.uk/Module.aspx?C=SEO&...&ModuleNo=28994This is meant to be ideal for cleaning them style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" />Lee. Quote Link to comment Share on other sites More sharing options...
g-man85 Posted July 27, 2006 Author Report Share Posted July 27, 2006 Have you removed the maf just to check that it doesnt need cleaning? As that could save you some money style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" />http://www.maplin.co.uk/Module.aspx?C=SEO&...&ModuleNo=28994This is meant to be ideal for cleaning them style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" />Lee.My MAF does look dirty. But how can you distinguish between a broken one and a dirty one? Quote Link to comment Share on other sites More sharing options...
g-man85 Posted July 29, 2006 Author Report Share Posted July 29, 2006 Got the spray from a mate, but not sure how to get the mesh grills off from the MAF. Anyway gave it a couple of sprays and left it to dry. Will give it a test later. But still in two minds if to replace the MAF as it seems to be running better than people say it should if it had a faulty MAF.Is there anything else people can think that might not appear on VAG COM that can affect turbo performance? I'm getting the turbo hoses checked, and don't suspect the EGR to be clogged much at 30K and seemed ok when i looked at it. Quote Link to comment Share on other sites More sharing options...
sleeky tdi Posted July 29, 2006 Report Share Posted July 29, 2006 On top of the maf their are two security star bit screws, get the right peice for them and the actualy maf wire itself will come out, dont touch it though, then spray it with that stuff and let it dry and pop it back on style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" />Lee. Quote Link to comment Share on other sites More sharing options...
g-man85 Posted July 29, 2006 Author Report Share Posted July 29, 2006 Cheers! Done the spraying bit! Will see if it makes any difference tonight! Quote Link to comment Share on other sites More sharing options...
Max69vk Posted July 29, 2006 Report Share Posted July 29, 2006 The best solution is to remove the element & soak it in K&N filter cleaner overnight, if that doesn't work I've got a spare working one you can have for £25 style="vertical-align:middle" emoid=";)" border="0" alt="wink.gif" /> Quote Link to comment Share on other sites More sharing options...
g-man85 Posted July 29, 2006 Author Report Share Posted July 29, 2006 The best solution is to remove the element & soak it in K&N filter cleaner overnight, if that doesn't work I've got a spare working one you can have for £25 style="vertical-align:middle" emoid=";)" border="0" alt="wink.gif" />When you say 'working' is it 100% functional? As mine works (kinda) but not 100% style="vertical-align:middle" emoid=":confused:" border="0" alt="confused.gif" /> Well i'm going to get the mechanic to run VAG COM on the MAF to check the readings as the car seems a tiny bit better after a clean (hard to tell really!)I'll contact you on Tuesday if i need the part! style="vertical-align:middle" emoid=":D" border="0" alt="biggrin.gif" /> Quote Link to comment Share on other sites More sharing options...
Max69vk Posted July 29, 2006 Report Share Posted July 29, 2006 Yep its fully functional I put a new one on before testing it was ok with VAGCOM, I wont be making that mistake again style="vertical-align:middle" emoid=":blush:" border="0" alt="blush.gif" /> Quote Link to comment Share on other sites More sharing options...
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