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Harry.O

Member Since: 25 Jul 2014
Location: Warwickshire
Posts: 706

TD5 Down on Power / Smoking - MAF Sensor?

I have a 2005 TD5 110 which seems to have got steadily slower over the last few days and puffs black smoke on gear changes. The vehicle has been remapped so always had a little puff but its getting worse. I have checked the injector loom which is bone dry at both ends then fitted new fuel and air filters but that hasn't cured it.

The Nanocom is reading air flow at 4.4 gr/hr and looking on the internet that seems quite low, does this sound like the MAF is the cause of the smoking/loss of power? I've unplugged the MAF and driven the vehicle but there doesn't seem to be much difference whether its connected or not.

Thanks in advance,

Harry

20th Jul 2016 7:15pm

Gav40

Member Since: 30 May 2015
Location: Maidstone
Posts: 41

My new Maf at idle

Click image to enlarge

20th Jul 2016 7:51pm

pj2106

Member Since: 20 Dec 2012
Location: Huntingdon AKA The Shire
Posts: 1500

2008 Defender 110 Puma 2.4 USW Stornoway Grey

Have you check intercooler and hoses? Red ecu plug for oil? 2008 110 2.4 XS Utility (Hagrid)
2002 90 TD5 Hardtop (Sully) Sold
1998 300TDi D1 (Billy) Sold

20th Jul 2016 10:03pm

Harry.O

Member Since: 25 Jul 2014
Location: Warwickshire
Posts: 706

Thanks for the quick responses gents

Gav40 - looks like the MAF is well below par, will get a new one ordered tomorrow. It could be that the remap/boost box is throwing funny readings although that was all done by Alive so inclined to think it would read true. Having read about on the internet it seems that 4.4 is quite a common reading to see when the MAF is dying. Similar example here: http://forums.lr4x4.com/index.php?showtopic=61385

Pj2106 - the red plug is clean and so is the plug at the engine end. Not had a chance to check the IC pipes but will plug the diagnostics in tomorrow on the drive to work and see if anything unusual is happening and have a play with the waste gate actuator to check that is free.

Whilst digging around this evening I found that the exhaust manifold gasket is blowing on the rearmost port so will change that tomorrow also...fingers crossed it's just the gasket and not a warped manifold! It developed a ticking noise about 3 days ago which would explain the leak.

Thanks guys,

Harry

20th Jul 2016 11:00pm

Fatboy Slim

Member Since: 04 Feb 2008
Location: Bridgend
Posts: 1006

4.40 is the ECUs default reading for when the airflow meter is dead

21st Jul 2016 6:45am

taazzukcb

Member Since: 30 Aug 2013
Location: Derbyshire
Posts: 663

2004 Defender 110 Td5 DCPU Stornoway Grey

As above

.

I had a dead MAF once, reading 4.4. Just unplugged it for a while whilst I sorted another.

Make sure you get Genuine/VDO branded!

21st Jul 2016 8:33am

mk1collector

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

Having just replaced my maf, when I unplugged the old one it felt like it took a good few journeys to improve the power, sort of like the ecu was taking time to reset to generic values. Ray
My build thread
http://www.defender2.net/forum/topic17615.html

21st Jul 2016 10:59am

Harry.O

Member Since: 25 Jul 2014
Location: Warwickshire
Posts: 706

Thanks all

New genuine MAF ordered this morning along with manifold gasket and studs etc. Hopefully that should have it sorted.

Interestingly there was no improvement having unplugged the MAF and driven it compared with it being connected although I only did a couple of miles, it will be interesting to see what benefits the new one brings. There is clearly a fault with it if it's giving such a low reading though.

Update to follow once the parts arrive tomorrow, thanks for all the help and advice

Harry

21st Jul 2016 2:36pm

Harry.O

Member Since: 25 Jul 2014
Location: Warwickshire
Posts: 706

Well problem all sorted

Upon removal of the exhaust manifold it had warped by 4mm when put on a flat surface. A friend had a de-webbed, heat treated and machined manifold which I was able to buy from him which saved trying to find a machine shop at 6pm on a Friday and should hopefully prevent the same happening again! 2 of the exhaust studs had sheared inside the head but managed to drill/extract them. Everything has been refitted with new gaskets as per the workshop manual and using uprated Wurth studs.

Took it for a spin and noticeably smoother with no black smoke and the ticking noise from the exhaust had disappeared.

I then changed the MAF and the engine seems much more happy, power delivery is smooth through the rev range. Not had enough time to see whether the work has improved the fuel consumption yet but hopefully should do.

The engine still seems a little down on power however improves each time I drive it so hoping that the ECU is slowly adjusting as per mk1collector's mention of recalibration.

All in all a good result, thanks to everyone for the help

Harry

29th Jul 2016 8:56am

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