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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
13%
 13%  [76]
EGRs not blanked & MAP sensor gunky
60%
 60%  [352]
EGRs blanked & MAP sensor clean
13%
 13%  [80]
EGRs not blanked & MAP sensor clean
13%
 13%  [76]
Total Votes: 584

character
 


Member Since: 31 Dec 2007
Location: wiltshire
Posts: 5781

United Kingdom 2005 Discovery 3 TDV6 S Auto Alaska WhiteDiscovery 3

Andrew, I got 26.5 mpg (according to the computer and zeroing him when stationary) towing me 3.5t car trailer with an assortment of vehicles on from VW Passats to Honda Civics Shocked
  
Post #78744818th Apr 2011 9:31 pm
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AndrewW
 


Member Since: 06 Aug 2007
Location: Saddleworth
Posts: 2302

United Kingdom 2016 Discovery 4 3.0 SDV6 Graphite LE Auto Orkney GreyDiscovery 4

My best is exactly that run, outward only (to see No 2 son in Leeds area) but on a very warm day in 2009, with M62 traffic doing 56mph all the way.

The D3 returned 35.6mpg on the little fibbing-screen!!! Shocked

I wonder if it's worth getting a replacement sensor, and if it makes no difference, selling it on to someone else to try the same thing... but £116, did you say?? Big Cry
 2006 D3 finally swapped for a 2016 D4 Graphite in Graphite grey. No mods  
Post #78745218th Apr 2011 9:36 pm
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AndrewW
 


Member Since: 06 Aug 2007
Location: Saddleworth
Posts: 2302

United Kingdom 2016 Discovery 4 3.0 SDV6 Graphite LE Auto Orkney GreyDiscovery 4

DSL wrote:
Was wondering in that case of the oil/gunk affected the air flow past the sensor.....


... or if the "hole" hadn't been cleaned out fully / effectively... From comments on here it is obviously not an item to poke and prod forcefully, nor use the airline on Shocked . So a squirt from an aerosol seemed a safe (but possibly inadequate) compromise.

A
 2006 D3 finally swapped for a 2016 D4 Graphite in Graphite grey. No mods  
Post #78745718th Apr 2011 9:45 pm
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Albourneboy
 


Member Since: 23 Feb 2006
Location: An old Victorian town in the NE
Posts: 1183

United Kingdom 

Did mine on Saturday morning. It looked like most of the pictures in this thread - a bit gunky but the hole was clear so has made no difference to the way the engine performs. My MY06 car's done >90K miles and the EGRs were blanked about 70K miles ago.

Going by the crud on the EGR stub pipes I removed from the intakes when I blanked the EGRs:
Click image to enlarge

I suspect that most of the crud on the MAP sensor was deposited in those first 20K miles when the EGR valves were operative and that very little has been added since Very Happy
 Now an ex-D3 owner after 7 happy years. Miss the car but not the big bills Smile
 
 
Post #78750119th Apr 2011 7:04 am
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Barry C-All
 


Member Since: 13 Nov 2008
Location: Essex
Posts: 169

United Kingdom 2014 Discovery 4 3.0 SDV6 HSE Auto Firenze RedDiscovery 4

Having almost broken down at 0230 hrs on the M1 recently, (see posting Engine system fault, started by Angelfire ), page 2 of that thread I wrote re.LR Assist diagnosed the Map sensor blocked, and stated that it was not an unknown failure.
In view of all that has been written since in this thread , and angelfire's thread refered to above, blocked MAP sensors seem to be a popular mallady that also takes the edge off of performance and fuel consumption, I am amazed that no one from a LR dealer or even LR themselves have made any comment , sugestions or even a remedy, even if the remedy is to remove the MAP and clean it out at every service: I am certain that these forums are read by dealers and manufacturers, as I do not believe that they can be that disinterested in the product. Yawn Yawn
  
Post #78753019th Apr 2011 8:49 am
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grzesiul
 


Member Since: 11 May 2008
Location: UK
Posts: 6394

Poland 2016 Discovery 4 3.0 SDV6 SE Auto Loire BlueDiscovery 4

Barry C-All - should some company produce the perfect product which would never brake that would put millions out of jobs --->stealers

nightmare scenario for them as they would never be able to sell anything else right Whistle
  
Post #78753619th Apr 2011 9:06 am
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DSL
Keeper of the wheelie bin 


Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73071

Ukraine 

Too busy changing expensive bits than doing a quick & (relatively) cheap clean up! Well that'swhst Mutley would say! Rolling Eyes Snigger
   
Post #78753719th Apr 2011 9:13 am
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azurar01
 


Member Since: 24 Feb 2011
Location: Gloucestershire
Posts: 509

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

Hi grzesiul,

Quote:
should some company produce the perfect product which would never brake that would put millions out of jobs


There would still be some jobs if they make a Discovery that 'would never brake ..."

Simon.
 D4 SDV6 HSE 11MY - Gone
D3 TDV6 HSE 08MY - Gone 
 
Post #78754119th Apr 2011 9:27 am
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DiscoDunc
 


Member Since: 08 May 2006
Location: Bristol
Posts: 16390

England 2010 Discovery 4 3.0 SDV6 HSE Auto Aintree GreenDiscovery 4

I thought these were MAF sensors Confused or MAP ... whats the difference ?

is the MAF on the air intake engine side of the air box ?
 Duncan
-----------------------------------------------------
If I'd known I was going to be so thirsty this morning I'd have drunk more beer last night.
FFRR Autobiography 4.4 SDV8 MY17
D4 HSE MY13 SOLD
FFRR 3.6 Vogue TDV8 SOLD
D4 HSE MY10 SOLD
D4 SE TECH MY15 SOLD
D4 XS MY12 SOLD
D4 HSE MY10 SOLD
D3 HSE MY06 - Re-Cycled Worldwide 


Last edited by DiscoDunc on 19th Apr 2011 9:30 am. Edited 1 time in total 
Post #78754319th Apr 2011 9:29 am
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grzesiul
 


Member Since: 11 May 2008
Location: UK
Posts: 6394

Poland 2016 Discovery 4 3.0 SDV6 SE Auto Loire BlueDiscovery 4

i stand corrected break whatever makes you happy pal Mr. Green
  
Post #78754419th Apr 2011 9:30 am
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DSL
Keeper of the wheelie bin 


Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73071

Ukraine 

Easy mistake to make Dunc, easy mistake!! Only saying that coz I did the same!! Big Cry :snogger: MAF = Mass Air Flow, beside the filter box. MAP = Manifold Absolute Pressure, under the engine cover as per DM's pic. Thumbs Up
   
Post #78754519th Apr 2011 9:39 am
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DSL
Keeper of the wheelie bin 


Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73071

Ukraine 

CALLING ALL MODS, CALLING ALL MODS:

Worth stickying this?? Whistle
   
Post #78754919th Apr 2011 9:42 am
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methley
a.k.a. Big Hairy Ski Monster 


Member Since: 07 Oct 2008
Location: Marshfield, South Glos
Posts: 2433

England 2006 Discovery 3 TDV6 SE Manual Java BlackDiscovery 3

What I'm taking from all this is that if the hole is not blocked then cleaning should/does make bu@@er all difference to performance.

Of course if the hole IS blocked then that would, understandably, affect performance somehow.
 Andy

Fridge Slide for sale https://www.disco3.co.uk/forum/post2064622.html#2064622 
 
Post #78755019th Apr 2011 9:45 am
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DiscoDunc
 


Member Since: 08 May 2006
Location: Bristol
Posts: 16390

England 2010 Discovery 4 3.0 SDV6 HSE Auto Aintree GreenDiscovery 4

DSL wrote:
Easy mistake to make Dunc, easy mistake!! Only saying that coz I did the same!! Big Cry :snogger: MAF = Mass Air Flow, beside the filter box. MAP = Manifold Absolute Pressure, under the engine cover as per DM's pic. Thumbs Up


Thumbs Up you'll be morfing into a Spanner Monkey soon... Thumbs Up
 Duncan
-----------------------------------------------------
If I'd known I was going to be so thirsty this morning I'd have drunk more beer last night.
FFRR Autobiography 4.4 SDV8 MY17
D4 HSE MY13 SOLD
FFRR 3.6 Vogue TDV8 SOLD
D4 HSE MY10 SOLD
D4 SE TECH MY15 SOLD
D4 XS MY12 SOLD
D4 HSE MY10 SOLD
D3 HSE MY06 - Re-Cycled Worldwide 
 
Post #78755119th Apr 2011 9:50 am
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DSL
Keeper of the wheelie bin 


Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73071

Ukraine 

Andy: That's what I dont understand, mine was not blocked but the difference is substantial. Before cleaning it wouldn't have out drag raced a heavily laden Fiat Panda, now it's back to in remapped level (remap lost at turbo change, will get it back on). MPG is also back to normal, what I did on Sunday pre clean would have had 28 on the trip, it's sitting at 33.7! And the difference was immediate, nothing else different. Don't know why, hence me asking about airflow over and past the sensor. Don't understand it but the mojo is back so happy bunny. Mr. Green

Duncan, no chance. I'd only break something. Whistle
   
Post #78755319th Apr 2011 9:52 am
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