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Go and clean your MAP Sensor NOW!!!
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How's your MAP sensor?
EGRs blanked & MAP sensor gunky
12%
 12%  [65]
EGRs not blanked & MAP sensor gunky
61%
 61%  [315]
EGRs blanked & MAP sensor clean
13%
 13%  [68]
EGRs not blanked & MAP sensor clean
12%
 12%  [63]
Total Votes: 511

Kilovolt
 


Member Since: 29 Jun 2015
Location: South Derbyshire
Posts: 291

United Kingdom 2013 Discovery 4 3.0 SDV6 Commercial XS Auto Baltic BlueDiscovery 4

I've been using a can of this....

http://www.motoelectrical.co.uk/crc-shop/c...ow-sensor/



Which I assume is the right stuff for the job? I think purity and evaporation rates are the essence of this stuff. Electrical contact cleaner is harsh and WD40 is more a lubricant (although I know it has a thousand and one cleaning applications - just look on YouTube) Thumbs Up

I used this to also clean the intake valve butterfly flappy-thingy which was looking rather crusty also Thumbs Up

Bought my last lot from Amazon back in Feb 2016 but it is not showing available now Big Cry

But the above link looks like a valid purchase.
 Current Ride: D4 XS Commercial Baltic Blue SDV6 fully loaded with heated everything Smile
Track Days: BMW E36 M3 Evolution MY 1996 (3.2 Litre 377 BHP sat in 1,250 Kgs of car, with a pro safety cage and some serious braking power) Smile 
 
Post #17439504th Dec 2016 4:13 pm
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ClassikFan
 


Member Since: 02 Nov 2016
Location: Surrey
Posts: 465

United Kingdom 2008 Discovery 3 TDV6 SE Auto Stornoway GreyDiscovery 3

Had a look at mine today and it was pretty sooty. Cleaned with a bit of brake cleaner.
Also discovered how to get the engine cover off! Nice and easy, no tools required, much simpler than the TD5 cover.
  
Post #175610931st Dec 2016 5:46 pm
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martindg
 


Member Since: 24 Jun 2015
Location: Werrington, Staffordshire
Posts: 41

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

I was towing our 1.5 tonne carvan to the Forest of Dean last week, going up a long steep B road out of Monmouth, lifted the throttle on a bend and the disco went into limp mode and displayed the special programs unavailable message, 3 miles at 20 mph, pulled over at the first layby restarted the engine, and all was fine again.

After read the error codes the only significant one was :-
P0234-00 (6Cool Unknown
After a bit of research i was having visions of changing the turbo in the hope that might fix it, i hate swapping parts to see what happens.

I came across this post, so today i had a quick look at ours. It was completely blocked with oil/crud as was the hole in the manifold. I cleaned it with contact cleaner and cleaned out the hole. I can't believe the difference it has made, our car has always had a noticeable flat spot from moving off, its like a different car now, very responsive, and much quicker, even my wife noticed the difference.

I used my iid tool to monitor the absolute manifold pressure in neutral over 750-3000 rpm before and after cleaning the map sensor, before it ranged from 0.9 to 1.1 bar, after cleaning it was 1-1.3 bar.

The egr valves had been blanked by the previous owner so hopefully it wont get blocked again, but I'll be cleaning from time to time.

Many thanks to all involved in this post, I'll check what effect it has on the limp mode problem and mpg.



  
Post #180285312th Apr 2017 4:27 pm
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Riggs
 


Member Since: 16 Apr 2017
Location: Auckland
Posts: 5

New Zealand 2005 Discovery 3 4.0 V6 Petrol SE Auto Zambezi SilverDiscovery 3

Do the petrol engines have a MAP sensor? I thought all modern engines had them? The only thing i have been able to find so far is that it is a EGR/MAP sensor but havent been able to confirm.
  
Post #18216472nd Jun 2017 2:07 am
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Mo
 


Member Since: 15 Sep 2016
Location: Thurrock
Posts: 123

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Thanks for the info! Cleaned mine too, loads of residue on it. Five (5) minutes job.
  
Post #183647413th Jul 2017 3:13 pm
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JohnnyNapalm
 


Member Since: 14 Jul 2017
Location: Ramsey
Posts: 121

Isle Of Man 2005 Discovery 3 TDV6 S Manual Zambezi SilverDiscovery 3
Good call

2005 2.7 TDV6. 93k and it was stinking.!
  
Post #183724715th Jul 2017 10:03 pm
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DSL
Keeper of the wheelie bin 


Member Since: 11 May 2006
Location: Somewhere.
Posts: 56331

United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Zermatt SilverDiscovery 4

When I changed my MAP sensor 80k miles agony EGRs were blanked. The sensor I took out of the D3 when I stripped her was like new. Blanking EGRs deffo eliminates the gunk buildup. Thumbs Up

Click image to enlarge
 

11 D4 HSE - just Dee, no more Double Disco. Sad 
 
Post #184009123rd Jul 2017 5:49 pm
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D&G
 


Member Since: 29 Jun 2017
Location: Charente 16480
Posts: 503

France 2006 Discovery 3 TDV6 HSE Auto Barolo BlackDiscovery 3

The D3 was a bit sluggish yesterday, see other post, so thought I would clean the MAP sensor today. It was on the list anyway.

Not as gunked up as I had hoped for.
Click image to enlarge

Click image to enlarge


A wipe down and cleaned the hole out. Not expecting it to make much of a difference.

I am wondering if Broadfields cleaned it up when they blanked the EGRs. It has done 123k so I suspect they did.
 

2006 Disco 3
Gas Gas 300ec
Gas Gas tx249
Bandit 1250
XR 600r
Pajero 2.8 Lifted and Safari Snorkel 
 
Post #185133626th Aug 2017 10:43 am
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Alphamale
 


Member Since: 28 May 2014
Location: Belfast
Posts: 393

United Kingdom 2005 Discovery 3 4.4 V8 SE Auto Bonatti GreyDiscovery 3

Riggs wrote:
Do the petrol engines have a MAP sensor? I thought all modern engines had them? The only thing i have been able to find so far is that it is a EGR/MAP sensor but haven't been able to confirm.


The 4.4 V8 petrol engines have a MAP, but the V6s don't seem to. It doesn't appear to get as badly contaminated with crud as the Diesels, but it's location at the rear of the inlet manifold, at the back of the engine, makes it a real B1tch to get at. You can't see it and it's hard to feel for it. In the end I had to use my Borescope both to find it and to help get it out.

When I did manage to get it out I found it was quite clean, but as it was in my hand I gave it a clean with contact cleaner. Putting it back was as hard as removal but manage it in the end.

I would say leave it alone, the petrol engine is cleaner than the diesel and not likely to soot up the MAP.
   
Post #185134826th Aug 2017 11:54 am
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Jubbly
 


Member Since: 20 Nov 2016
Location: Stourbridge
Posts: 137

United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Stornoway GreyDiscovery 4

Cleaned mine up, 2011 97k miles.

Not remapped or egr blocked.






 HSE with Flappy Paddles. IID BT tool. RLD Spare Protector.

 
 
Post #187789310th Nov 2017 11:19 am
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