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MartinK

Member Since: 02 Mar 2011
Location: Silverdale (Lancashire/Cumbria Border)
Posts: 2664

2011 Defender 110 Puma 2.4 USW Orkney Grey

Just a BIG THANK YOU for those adding value to this thread, especially the OP.

My Defender is 10 years old, and 52k miles (owned by me from new, with no maintenance given previously to the VCV or MAF).

Had a few sporadic issues with my Defender 2.4 TDCI recently. including intermittent power loss, not being able to rev out, and even stalling on idle.

I changed the VCV a couple of weeks ago, it did make some improvement but still having some issues. Cleaned the MAF today with Comma Contact Cleaner (from Halfrauds) and Yay! Back to full performance.

Thanks guys...wealth of knowledge on here

Defender "Puma" 2.4 110 County Utility (possibly the last of the 2.4's)

12th Sep 2021 4:42pm

Gasket

Member Since: 30 May 2020
Location: Manchester
Posts: 629

This is a really interesting thread - I'd literally just been going through the LR Maintenance Check Sheet for my 2.4 90 and was surprised that there's very little recommended in terms of cleaning parts of the engine bay beyond fluids and filters. I'd been about to ask about other areas to clean when I saw this post.

The obvious question is are there any other areas of the engine worth periodically removing and cleaning? (scope would be driveway service rather than a full engine strip-down like Nige).

I'm about to fit a replacement cat from a low mileage vehicle due to my old downpipe being a little rusty, I'll obviously do all the oils, fluids and filters plus, now, the MAF and MAP sensors - are there any other pinch points? (EGR is always something that strikes me as a gunk-trap).

13th Sep 2021 3:27pm

Grenadier

Member Since: 23 Jul 2014
Location: The foot of Mont Blanc...
Posts: 5765

2011 Defender 110 Puma 2.4 DCPU Corris Grey

hank wrote:
I asked the same question in the last post of the below thread but got no response

https://www.defender2.net/forum/topic68596-45.html

I would also like to do this when time permits having seen seen some horror photos around the internet!

Click image to enlarge

What/where the h*ll is that Hank? Monsieur Le Grenadier

I've not been everywhere, but it's on my list.....

2011 Puma 110DC - Corris Grey

13th Sep 2021 5:56pm

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 1763

LandRoverAnorak wrote:

There's also this one in the pipe to the top of the intercooler but I don't know what it's called:

Click image to enlarge

LRA, I think that 3rd green coloured sensor you show is an “Air Charge Sensor” part number LR032216

That’s what LR call it but in reality I think it’s an Air Charge Temperature Sensor.

Listed as part 8 on this diagram https://www.lrworkshop.com/diagrams/land-r...es_2.2tdci

Noting I can’t see the equivalent sensor on the 2.4.

My understanding of the roles these sensors perform.
So function wise the MAF is measuring the volume of air from the filter box on its way to the turbo, the turbo is compressing the air but in doing so also heats it, so the compressed air is sent to the intercooler to be cooled and increase its density, the Air Charge Sensor is measuring the temperature of the air exiting the intercooler and heading to the inlet manifold and the MAP sensor is measuring the pressure of the air in the inlet manifold. These three sensors are providing inputs that are used with other inputs to determine and provide the optimum fuel air mixture at any specific time.

So having them all nice and clean and sending correct data to the ECU is key . Noting that 3rd (green coloured) Air Charge Sensor that LRA highlighted seems to get missed out in other threads but I expect it plays a key role as well.

13th Sep 2021 6:24pm

Julie

Member Since: 07 Oct 2017
Location: Nantes
Posts: 421

2012 Defender 110 Puma 2.2 SW Keswick Green

X4SKP wrote:
I would only use a recommended cleaner on them as these units are expensive at around £140 + Vat
(£168.00 Inc) from Land Rover, there are factored claimed equivalents on the market at around £70.00 Inc

Some days ago, I just read that recommended cleaners were 99% white gas or paraffine

They list the substances on their product sheets...

13th Sep 2021 6:29pm

Rich01483

Member Since: 26 Jul 2021
Location: Uk
Posts: 15

Thanks everyone for this, lots more to add to the to do list!

23rd Sep 2021 7:07pm

glpinxit

Member Since: 31 Jul 2010
Location: Somerset
Posts: 149

Found this thread a couple of weeks ago and have now had the chance to use brake cleaner to clean all 3 sensors highlighted in @LandRoverAnorak 's post. 32K mile 2.2 engine and only the MAP sensor appeared at all grubby and that only looked vaguely sooty. So no particular expectation of noticeable improvement but it has mostly eliminated a bit of a tendency to lurch when driven slowly and stutter on part throttle at a steady 60mph.
The aerosol brake cleaner smells like tetrachloromethane (or carbon tetrachloride if you are older). Used to be recommended in the 1960s for removing beach tar from clothing. Cheers, Guy.

25th Sep 2021 4:26pm

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 1763

Brake cleaner should not be used on the sensors, you need to use specialist MAF sensor cleaner such as Liqui moly air flow sensor cleaner, else you can likely do more damage than good. It not expensive and you only need a little on each sensor.

25th Sep 2021 7:02pm

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