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mk1collector



Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769

England 2004 Defender 110 Td5 CSW Bonatti Grey
Just checking about MAF
So, before I get the multi meter out tomorrow, I think my MAF might have had it. I just want to check if these symptoms are likely to be the maf. The last two tanks of fuel I've put in, I have got roughly 40 to 60 miles less from each than usual, also driving has felt (not underpowered) lacking something and when arriving at junctions, when taking my foot off the accelerator it felt like hitting a wall with a lurch too a stop. Today I unplugged the MAF and the driving seemed a bit better but I'm not sure if that's just the placebo effect. The lurching too a stop also seems to be smoother so I'm hoping my diagnosis is correct but wanted to see if these symptoms sound right before I she'll out money and try and get my long unused multimeter working to check it in the light tomorrow. Embarassed

Cheers
Ray
Post #302118 25th Jan 2014 7:47pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20337

United Kingdom 
Have you recently had any EGR issues or simply you suspect the MAF? $W33T $0U7H3RN $UG4R
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Post #302146 25th Jan 2014 8:36pm
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mk1collector



Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769

England 2004 Defender 110 Td5 CSW Bonatti Grey
Egr is removed and as many of the problems people have on here seem to relate to the MAF I thought I'd try unplugging it to see if there was a difference. I should have put that my defender is a 2004 td5.
Post #302152 25th Jan 2014 8:43pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20337

United Kingdom 
I think you can clean it with electrical contact cleaner.
It could indeed cause a varied range of issues as it monitors air volume into the intake and various other things electronically so if it is fouled up it could put it's readings out altering performance. $W33T $0U7H3RN $UG4R
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Post #302169 25th Jan 2014 11:08pm
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mk1collector



Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769

England 2004 Defender 110 Td5 CSW Bonatti Grey
I took it out and cleaned it last week so I don't think that's the problem. I'll see if my multi meter works tomorrow to see if it gives me any ideas. If it shows up nothing I'll see if the mileage is back to normal with the MAF unplugged.
Post #302171 25th Jan 2014 11:25pm
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bga86



Member Since: 17 Jan 2014
Location: Here and there
Posts: 205

2015 Defender 90 Puma 2.2 HT Fuji White
Sounds like maf troubles, any smoke/unresponsive throttle when cold?
If you change it only go for a Siemens vdo one as the cheap knock off ones last two minutes!!!
Post #302212 26th Jan 2014 10:18am
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mk1collector



Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769

England 2004 Defender 110 Td5 CSW Bonatti Grey
Well, according to the bas website the MAF should rear about 2v from pin 2 at idle and mine reads ...... 0.04 Shocked
So I guess I need to replace that then Big Cry What I thought strange was the difference it's made rolling upto junctions, because with the MAF unplugged when I come to a junction now and press the clutch, the revs don't seem to drop like a stone and almost violently rock the engine (like the feeling of staling but with the engine still running) also without the drop off in revs when depressing the clutch, the gear changes seem smoother. I hope when I plug the new MAF in this will be further improved.
Cheers
Ray
Post #302327 26th Jan 2014 4:22pm
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Caterham



Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6298

England 2011 Defender 110 Puma 2.4 XS CSW Stornoway Grey
Are you suggesting T idle there should be approx 2v between pin 2 and earth?
Post #302333 26th Jan 2014 4:54pm
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mk1collector



Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769

England 2004 Defender 110 Td5 CSW Bonatti Grey
According to the bas website it should. This is on a td5 so I'm not sure if it's the same on a puma. If you look under misc on the site they offer td5 MAF's click on the page and at the bottom it shows how to check the voltage. I've just ordered a new MAF from bas so fingers crossed there's a difference when it's fitted Mr. Green

Ray
Post #302334 26th Jan 2014 5:03pm
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bell-auto-services



Member Since: 08 Jul 2007
Location: North Yorkshire
Posts: 2232

United Kingdom 2013 Defender 110 Puma 2.2 USW Orkney Grey
That low volts on a TD5 output means only a couple of things.

Its dead as a dodo or the input feed to it is dead and not powering the maf its self, but if it were this it would generally give 0v out at all.

Knowing the td5 like I do I think you will as you suspect and find the maf Is dead and does need to be replaced.
We can assume the Input voltage on your car is actually ok as you do have some power out albeit very small at 0.04v

Glad the simple test helped you out, thank you for the order. It will be sent out tomorrow for you.


Regards Pete.
Post #302350 26th Jan 2014 6:19pm
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mk1collector



Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769

England 2004 Defender 110 Td5 CSW Bonatti Grey
It was a great help Thumbs Up I'm ready to fit it as soon as it arrives Rolling with laughter I'm not impatient honest Whistle
Post #302369 26th Jan 2014 6:58pm
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bell-auto-services



Member Since: 08 Jul 2007
Location: North Yorkshire
Posts: 2232

United Kingdom 2013 Defender 110 Puma 2.2 USW Orkney Grey
Thumbs Up
Post #302378 26th Jan 2014 7:07pm
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mk1collector



Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769

England 2004 Defender 110 Td5 CSW Bonatti Grey
MAF arrived safely this afternoon and got fitted before the light went Thumbs Up I've got a bit of a run out tomorrow to pick up some seats so it'll get a good test with about a 250 mile round trip.
Cheers
Ray
Post #302954 28th Jan 2014 8:18pm
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bell-auto-services



Member Since: 08 Jul 2007
Location: North Yorkshire
Posts: 2232

United Kingdom 2013 Defender 110 Puma 2.2 USW Orkney Grey
Glad it arrived in good time. Hopefully it's fixed your problem.

Pete.
Post #302965 28th Jan 2014 8:31pm
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Jimb1978



Member Since: 05 Sep 2012
Location: Huddersfield
Posts: 808

England 2002 Defender 110 Td5 Black LE Java Black
It will be interesting to see how this pans out as mine is really jerky when backing off the power at low speeds. Things tend to improve when it gets warm though.
Post #303006 28th Jan 2014 10:04pm
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