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agentmulder

Member Since: 16 Apr 2016
Location: Outer Space
Posts: 1324

MAF cleaning spray. Worth it? Then pilot correction?

Gidday,

So I've seen various brands of MAF specific cleaners about. All aerosol, and all quite expensive when compared to other solvents like brake cleaner, contact cleaner etc.

They typically state 'HP increase!' and so on ..

I've had a read about the MAF, and it stands to reason that a sensor giving falsely low readings (assuming a dirty wire will take longer to cool than a clean one) isn't going to be the best situation.

I don't want to hazard a guess as to what the ECU will make of it - but let's just assume it'll be less efficient.

So, I'm keen to try it. Aside from general discussion regarding these cleaners i have a specific question:

Will a pilot direction relearn be a good next step? I did that with the VCV swap, and considering that the sensors are all involved in the lead up to the same process (combustion)... Yeah?

The relearn might settle on a different (better) set of values considering the MAF is now giving more accurate readings?

This is on 2.4 puma, with Stage 1 BAS remap. MAF never cleaned, never had apparent issues .. Solved the bowel problem, working on the consonants...

24th May 2017 4:02am

Morepower

Member Since: 08 Jan 2013
Location: Fife, Scotland
Posts: 630

You shouldn't need to re-set anything, The ECU should automatically correct for any small changes in the MAF readings...

Regards

Tim It doesn't matter how bad it is, It can always get worse...

2013 Bowler 110 (Sold)
2016 Bowler 90 Rally Spec (Sold)

24th May 2017 9:09am

agentmulder

Member Since: 16 Apr 2016
Location: Outer Space
Posts: 1324

I would have thought it would be calibrated for a clean wire and then progressively read lower than actual air flow, then go back to 'normal' upon cleaning?

Or in other words it'll correct when cleaned, but not as it's getting dirty.

? Solved the bowel problem, working on the consonants...

24th May 2017 9:17am

Morepower

Member Since: 08 Jan 2013
Location: Fife, Scotland
Posts: 630

The MAF will be designed to read over various conditions, All the happens is when they get dirty they take an 'offset' that can mean that the airflow measured won't match the actual airflow... By cleaning it, It should loose the offset (if it has one)... However, please be careful as it's very easy to damage a MAF....

Regards

Tim It doesn't matter how bad it is, It can always get worse...

2013 Bowler 110 (Sold)
2016 Bowler 90 Rally Spec (Sold)

24th May 2017 9:27am

Naks

Member Since: 27 Jan 2009
Location: Stellenbosch, ZA
Posts: 2586

2010 Defender 90 Puma 2.4 SW Alpine White

I just use carb cleaner, no issues. --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport V8 Supercharged

Defender Puma Workshop Manual: https://bit.ly/2zZ1en9
Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO
Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ

24th May 2017 9:28am

ian series 1

Member Since: 17 Nov 2014
Location: south
Posts: 3127

2008 Defender 90 Puma 2.4 CSW Bonatti Grey

Carb cleaner, brake cleaner, any solvent based cleaner that will remove oil based deposits.
As said, ecu will revert back to normal conditions after cleaning, you don't get re learn options for either MAF or MAP sensors. 80" 80" 86" 88" 90"

Wanted, Forward Control Anything considered.

24th May 2017 10:11am

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19535

http://www.ebay.co.uk/itm/Holts-Brake-And-...SwbqpT6gNH
That'll do you for next to no cost, I've done this just a few weeks ago with the MAP and MAF and you WILL notice the difference in performance.

Diesel$ Live$ Matter. ⛽️🛢️👨‍🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧

24th May 2017 2:06pm

agentmulder

Member Since: 16 Apr 2016
Location: Outer Space
Posts: 1324

ian series 1 wrote:
you don't get re learn options for either MAF or MAP sensors.

My intention was more that the pilot correction relearn would relearn the settings related to pilot correction, but in the new context of a cleaner MAF.

(I relearned last with a dirtier one)

Anyhoo, did this today, the solvent was the actual stuff, CRC brand - on special

While I'm well aware of my propensity for confirmation bias, I'll still say it 'felt' like things were improved, sounded smoother, the engine was having a good day, if you know what I mean

Solved the bowel problem, working on the consonants...

3rd Jun 2017 5:17am

JustFX

Member Since: 10 Nov 2016
Location: Mendip Hills
Posts: 190

2000 Defender 110 Td5 CSW Coniston Green

The technology in the MAF is a form of a hot wire anemometer[1]. The wire is heated and the drop in temp is measured. The wire is often very thin and prone to damage.

If it gets coated in oil/dirt then that will insulate it slightly and give you lower airflow readings.

A quick clean with some solvent on a regular basis is wise.

Jack
[1]https://en.wikipedia.org/wiki/Anemometer[2]
[2]https://en.wikipedia.org/wiki/Thermal_mass_flow_meter

3rd Jun 2017 12:01pm

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