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boxoftricks

Member Since: 06 Feb 2019
Location: Home Counties
Posts: 748

2011 Defender 110 Puma 2.4 USW Zermatt Silver

MAF sensor / Snorkel airflow

My 2010 TDCI 110 cruises with a Safari snorkle fitter cruises along at 60mph doing circa 30 MPG and 70mph doing circa 20 MPG no problem. As soon as I go up to 80mph for a more than a couple of minutes I get the good old engine light comes on and its a MAF sensor failure code (the exact one I cannot remember).

I've run it with a diagnostic app and the MAF seems to be working ok with the reading fluctuating correctly so believe it is working oK. I can clear the fault, drive at below 75mph for weeks and no fault.....

Could the fault be caused by a lack of airflow into the engine as it is being restricted by the snorkel? Has anyone experienced anything similar?

If it is the snorkel has anyone any recommendations on one I could change it for that still comes out of the side vent, I don't want to cut into the bonnet.

17th Jun 2019 12:21pm

andydef90

Member Since: 09 Feb 2015
Location: yorkshire
Posts: 617

2014 Defender 90 Puma 2.2 HT Corris Grey

daft question have you checked for any obstruction in your snorkel my maf failed under hard acceleration this seems to be common

17th Jun 2019 1:14pm

boxoftricks

Member Since: 06 Feb 2019
Location: Home Counties
Posts: 748

I'll double check it.

17th Jun 2019 3:32pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17779

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

I've never had any problems like that with mine.

Not all snorkels are created equal. Much larger pipework than most, much better under the bonnet, and no cutting required:-

Click image to enlarge

17th Jun 2019 6:18pm

Roy5695

Member Since: 15 Feb 2014
Location: Cornwall
Posts: 1123

2011 Defender 110 Puma 2.2 XS DCPU Indus Silver

I had a safari snorkel fitted for years and never had any problems with the MAF sensor. I run a pretty good tune as well so it sucks pretty hard, so hard that the silicone pipe i had fitted for a while used to collapse under the pressure.

Have you had it plugged in properly as the EGR can sometimes cause various misleading faults. 2011 Defender DCPU 2.2 - https://www.defender2.net/forum/topic30623.html

Instagram - @r22oyp

Roy

17th Jun 2019 7:04pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20833

I've never had a single problem with mine at all with a Safari, are you sure your MAF isn't on its way out?
EGR can sometimes affect it, with readings as well. _\Hennessey|Venom| F5/___
___\⭐️Lone|Star|State/___
____\We|Will|Win/___
____/🇬🇧🇺🇸\____
_//*⛽️🛢️⚙️🧰*\\_

17th Jun 2019 10:13pm

neon1991

Member Since: 26 Mar 2018
Location: Colchester
Posts: 101

2014 Defender 110 Puma 2.4 USW Firenze Red

had a similar problem with mine. it ended up being the EGR. although I couldnt see much wrong with it. I changed the MAF, same fault appeared. Then changed the EGR and has been fine since

19th Jun 2019 10:04am

hank

Member Since: 12 Sep 2016
Location: South Wales
Posts: 2331

I also have no issues with a safari fitted > 110 XS Double Cab

19th Jun 2019 10:16am

boxoftricks

Member Since: 06 Feb 2019
Location: Home Counties
Posts: 748

neon1991 wrote:
had a similar problem with mine. it ended up being the EGR. although I couldnt see much wrong with it. I changed the MAF, same fault appeared. Then changed the EGR and has been fine since

I think I'll have to give that a try. Hopefully cleaning the ERG will do the trick

19th Jun 2019 1:49pm

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