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SteveS

Member Since: 05 Oct 2010
Location: Devon & Berkshire
Posts: 388

2009 Defender 110 Puma 2.4 USW Santorini Black

MAP sensor - cleaning didn't work

Regarding my earlier post on MAP sensor and uneven acceleration the advice was to clean the sensor - which I've now done. Unfortunately this made no difference to this particular fault. Does anyone have any other ideas as to what might cause the symptoms:

~~~~~~~~~~~~~~

Always when engine cold (but possibly to a slight degree when hot) on light throttle in say 2nd gear the engine power surges and recedes - sort of like a subtle slow kangaroo-ing. Engine is 2.4L TDCi 18 months old - unmodded as far as I know. I think I read that this could be due to the MAP (not MAF??) sensor - Manifold Absolute Pressure? - being faulty or dirty. Am I on the right track or is there another well known problem? Problem less obvious under hard acceleration.

~~~~~~~~~~~~~~

The MAP sensor was tarred up but the problem lies elsewhere

20th Oct 2010 6:51pm

Scallops

Member Since: 15 Aug 2007
Location: Brisbane Australia
Posts: 89

Re: MAP sensor - cleaning didn't work

SteveS wrote:
Regarding my earlier post on MAP sensor and uneven acceleration the advice was to clean the sensor - which I've now done. Unfortunately this made no difference to this particular fault. Does anyone have any other ideas as to what might cause the symptoms:

~~~~~~~~~~~~~~

Always when engine cold (but possibly to a slight degree when hot) on light throttle in say 2nd gear the engine power surges and recedes - sort of like a subtle slow kangaroo-ing. Engine is 2.4L TDCi 18 months old - unmodded as far as I know. I think I read that this could be due to the MAP (not MAF??) sensor - Manifold Absolute Pressure? - being faulty or dirty. Am I on the right track or is there another well known problem? Problem less obvious under hard acceleration.

~~~~~~~~~~~~~~

The MAP sensor was tarred up but the problem lies elsewhere

Well - mine does this exact thing when the EGR valve is bunged up. Had it replaced a while back - totally went away. Started doing it again more recently, so I took it back to LR - they said the 2nd EGR valve was again sticking and replaced it for a 3rd valve and the surging has gone again.

The solution is - short term, new EGR valve, long term - wait for the German bloke on here to come through with the blanking kit and software patch.

21st Oct 2010 3:01am

Naks

Member Since: 27 Jan 2009
Location: Stellenbosch, ZA
Posts: 2638

2010 Defender 90 Puma 2.4 SW Alpine White

Re: MAP sensor - cleaning didn't work

I'm with Russell wrote:
The solution is - short term, new EGR valve, long term - wait for the German bloke on here to come through with the blanking kit and software patch.

It may be worth it to take out the EGR and clean it regularly, say every 10Kkm or so?

21st Oct 2010 5:12am

K9F

Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey

Re: MAP sensor - cleaning didn't work

Naks wrote:
It may be worth it to take out the EGR and clean it regularly, say every 10Kkm or so?

Agree totally if you've got the time and inclination....was meaning to do it but LR Assist had to be called and a new EGR Valve fitted under warranty before I found time to do it!

If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!

21st Oct 2010 6:52am

mse

Member Since: 06 Apr 2008
Location: UK
Posts: 5035

2016 Defender 110 Puma 2.2 XS CSW Scotia Grey

How hard is getting at the egr on these, ive never really looked. Mike

21st Oct 2010 6:56am

Naks

Member Since: 27 Jan 2009
Location: Stellenbosch, ZA
Posts: 2638

Re: MAP sensor - cleaning didn't work

K9F wrote:
Agree totally if you've got the time and inclination....was meaning to do it but LR Assist had to be called and a new EGR Valve fitted under warranty before I found time to do it!

Didn't I read somewhere on this forum that LR stealers put some kind of EGR cleaner in your diesel tank when they service the vehicle?

If so, it would make sense to stick a bottle of that stuff regularly, every 5000km or so?

I have been adding 2-stroke oil to my Puma since day 1, theoretically this should mean my EGR is cleaner than just running with diesel. I will ask the stealer to open and clean the EGR at the first service, only got 12Kkm on the clock, so 8Kkm more to go until then.

21st Oct 2010 7:09am

o4dn

Member Since: 08 Jan 2010
Location: South West
Posts: 538

2009 Defender 90 Puma 2.4 SW Alaska White

Re: MAP sensor - cleaning didn't work

Naks wrote:
I'm with Russell wrote:
The solution is - short term, new EGR valve, long term - wait for the German bloke on here to come through with the blanking kit and software patch.

It may be worth it to take out the EGR and clean it regularly, say every 10Kkm or so?

I did clean the MAP sensor as well last weekend.

I also ran the EGR cleaning procedure by starting/stopping the engine several times (maybe 5 or 6 times, leaving it running for 30 secs or so in between) and it seems to have improved... Or maybe it's just me

21st Oct 2010 7:25am

jlerra

Member Since: 10 Jul 2009
Location: Gibraltar/London
Posts: 149

2007 Defender 90 Puma 2.4 XS CSW Java Black

Map problem?

SteveS,
Try changing/testing the clutch switch on top of the brake master cylinder.
Have a look on page 2 of the Defender2 forum under 'over-revving on changing gear'
Might not be anything to do with map.

el pepe flamenco JLS
'El Pepe Flamenco'

21st Oct 2010 8:57am

BIGFOG

Member Since: 12 Sep 2010
Location: Edenbridge
Posts: 537

2009 Defender 110 Puma 2.4 USW Stornoway Grey

Who is the German bloke??

22nd Oct 2010 9:24pm

Scallops

Member Since: 15 Aug 2007
Location: Brisbane Australia
Posts: 89

BIGFOG wrote:
Who is the German bloke??

Red Desert - http://www.defender2.net/forum/topic358-105.html

23rd Oct 2010 1:32am

spudfan

Member Since: 10 Sep 2007
Location: Co Donegal
Posts: 4655

Re: MAP sensor - cleaning didn't work

Naks wrote:
K9F wrote:
Agree totally if you've got the time and inclination....was meaning to do it but LR Assist had to be called and a new EGR Valve fitted under warranty before I found time to do it!

Didn't I read somewhere on this forum that LR stealers put some kind of EGR cleaner in your diesel tank when they service the vehicle?

If so, it would make sense to stick a bottle of that stuff regularly, every 5000km or so?

I have been adding 2-stroke oil to my Puma since day 1, theoretically this should mean my EGR is cleaner than just running with diesel. I will ask the stealer to open and clean the EGR at the first service, only got 12Kkm on the clock, so 8Kkm more to go until then.

You might like to Google DIPETANE FUEL TREATMENT. I got a bottle of the stuff. If it's claims for reduction in waste gases ,including a big reduction in the NOx emissions are true it should go a long way to keeping the EGR valve clean. I have e-mailed them specifically regarding the EGR valve in the Land Rover Defender TDCI 2.4 engine. When I get the reply I will let you know. If it works and if it only needs occasional use it would be o.k Could work out expensive if needed at every fill.
Another product AUTOMAINTAIN fuel system clean and restore is used once every 10,000 miles. It has similar claims. I did contact AUTOMAINTAIN who said that the Fuel System Clean and Restore will keep the EGR valve clean. I can forward you the e-mail if you want it. My main dealer uses Automaintain Profession Oil System Clean and Restore at servicing.That is how I came across Automaintain.
Anyway the Automain Fuel System Clean and Restore would appear to be better value as it is used once every 10,000 miles and it claims to clean the whole exhaust system. Does not take much to do a search on both products and have a read. 1982 88" 2.25 diesel
1992 110 200tdi csw -Zikali
2008 110 2.4 tdci csw-Zulu
2011 110 2.4 tdci csw-Masai

25th Oct 2010 12:29pm

K9F

Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

I use this: Millers at a tad over £9 per bottle somewhat cost effective and that can do a total of 10 tank fills. I find it 'does for me!' Not had any problems since and must admit last time I changed my EGR Valve blank from 12mm down to 10mm blank was not as dirty as previous prior to use!

http://www.google.co.uk/imgres?imgurl=http...s%3Disch:1 If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!

25th Oct 2010 6:00pm

BIGFOG

Member Since: 12 Sep 2010
Location: Edenbridge
Posts: 537

My Puma drinks the same Millers additive, I get it from Halfords...

29th Oct 2010 9:49pm

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