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)
I used this to also clean the intake valve butterfly flappy-thingy which was looking rather crusty also
Bought my last lot from Amazon back in Feb 2016 but it is not showing available now
But the above link looks like a valid purchase."Track day running - Don't put your foot back on the accelerator until your absolutely sure you don't have to take it off again"
Current Ride: D4 XS Commercial Baltic Blue SDV6 fully loaded with heated everything
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)
4th Dec 2016 4:13 pm
ClassikFan
Member Since: 02 Nov 2016
Location: Surrey
Posts: 1047
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.
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 (68) 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.
12th Apr 2017 4:27 pm
Riggs
Member Since: 16 Apr 2017
Location: Auckland
Posts: 6
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.
2nd Jun 2017 2:07 am
Mo
Member Since: 15 Sep 2016
Location: Thurrock
Posts: 174
Thanks for the info! Cleaned mine too, loads of residue on it. Five (5) minutes job.
13th Jul 2017 3:13 pm
JohnnyNapalm
Member Since: 14 Jul 2017
Location: Ramsey
Posts: 184
Good call
2005 2.7 TDV6. 93k and it was stinking.!
15th Jul 2017 10:03 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73084
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.
Click image to enlarge
23rd Jul 2017 5:49 pm
D&G
Member Since: 29 Jun 2017
Location: Charente 16480
Posts: 3483
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.An honorable defeat is better than a dishonorable victory.” ― Millard Fillmore
2006 Disco 3
Gas Gas 300ec / Gas Gas tx249 / Bandit 1250
XR 650r / Pajero 2.8 Lifted and Safari Snorkel-gone.
26th Aug 2017 10:43 am
Alphamale
Member Since: 28 May 2014
Location: Belfast
Posts: 497
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.
26th Aug 2017 11:54 am
Jubbly
Member Since: 20 Nov 2016
Location: Stourbridge
Posts: 401
Member Since: 10 Apr 2017
Location: Hong kong
Posts: 6
Thanks for the great tip. 8 5,000 km
Very gunky!
Seen to drive better.
Will try semi-synthetic 2 stroke oil when i find it.
Would someone please tell me how do I know when it's time to replace the egrs?
26th Dec 2017 9:09 am
davidhem
Member Since: 21 Feb 2013
Location: Kenilworth
Posts: 710
So not being able to sleep much at the moment due to 3 rather large scars on the back of my head from an op, I was browsing the forum through the night, and read about cleaning the MAP sensor, I had the EGRs blanked last week and a BAS remap done which made the car much more perky, but maybe not as powerful as I would have hoped.
I cleaned the MAP sensor this morning, it was covered in oily gunk, I used brake cleaner and resisted putting anything in the hole, just kept spraying brake cleaner in it and tapping onto paper cloth.
Wow, what a difference, after the car had warmed up, I could tell the car was so much more urgent, I have no hesitation from standstill, and only need very small throttle movements to keep the car moving along, I dont think the mpg has improved per se, but the car is brilliant to drive now, much better of the mark than my 3.0D 8 speed D4 ever was. I never thought I would ever say that!!David
20th Aug 2018 4:31 pm
tony gt
Member Since: 29 Jul 2018
Location: cardiff
Posts: 10
I read this topic on the forum and thought I would clean the sensor and see if there was any difference on my 56k Disco3.
Wont bother posting a picture as it looked like all the blocked up sooty ones already shown.
WHAT A DIFFERENCE!
Cant believe how fast it is now off the line. Its like an extra turbo has been added!
Said nowt to its other driver who promptly reported that "The car seems a bit nippier today".
Will have too wait and see if the thirst is any different.
Thanks to all who have brought this tweak to my attention.
One tip though on cleaning it, it is a sensor, the clue is in the name. It is sensitive, sticking a bit of wire or a drill bit into its orifice could result in a full failure. Just rely on the power of the WD40 jet or whatever cleaning fluid you use.RR classic, dead in Ireland,
TD300, sold to a friend but totally restored,
TD5, gone but still going,
Ginetta G27 v8,
Porsche boxter,
low cost track car,
Disco 3 2008
14th Sep 2018 5:07 pm
CVJase08
Member Since: 05 Feb 2018
Location: Warwickshire
Posts: 15
I like hints tips, suggestions and doing things that make a difference.. I stumbled across this thread and thought why not give it a go..
MAP removal and replace was a breeze and although gunk’ed up (below pic), I was expecting much difference post clean for the little time and effort put in.
to my surprise the motor notably pics up much smoother and it more responsive... didn’t help with my temperamental EGR light but well worth giving it a go.. next job EGR!
9th Oct 2018 4:19 pm
disco_shantz
Member Since: 27 Jul 2018
Location: Greater London
Posts: 2
Hi there all. Had my 57 plate LR3 diesel with 98k miles for about a year now. Car started to feel sluggish.
I had a look at the Mass Air Flow sensor and there is a gloopy black glob at the base of the wire, doesn’t feel like it should be there, would I be right? I tried to spray it off with electrical contact cleaner but wouldn’t budge. I don’t want to touch it as the MAF sensor is very sensitive I understand. Should I replace it?
Tomorrow I’m going to clean the MAP sensor and see if that helps too.
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