Lack of low end power

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toladessip

New Member
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Hi all, this is my first post as i need help with my TD4, as pretty soon i am going to have an accident pulling out of a junction. I just don't seem to have any power any more at low speed or if i hit a hill at speed i slow down. Turbo sounds ok with the whistle and does seem to pick up a bit when i hear it but nothing like it used to. Even the cruise control has stopped working ( probably not enough power to keep the set speed ). She is a 2001 with 64K on the clock. All help much appreciated. thank you, Steve
 
Not owning a TD4 I have no direct experience here, but is this sounding like the old chestnut where the turbo boost control vanes are stuck in the low boost position?
 
A flat spot pulling out of junctions is often caused by a faulty MAF sensor. It's easily confirmed simply by disconnecting it an going for a drive, if it's faulty you'll notice an immediate improvement.
If you don't know it's located below and behind the oil filler, you'll need to remove the air filter cover to access it.

That may be all it is but if you still have no power going uphills it could be a fuel pump issue but I've a feeling it's just the MAF.

Use the forum search for similar complaints and faults. :)
 
Thank you both for your replies. Chaser, can you tell me if the pic shows the part you are talking about. My Freelander is automatic so it amplifies the slow pick up as there is nothing you can do about it. It also seems to go backwards once you reach 70 ish and hit a slight incline. this is also true when setting off as it seems to want to go then feels like its fighting itself and does not pick up any more speed (or does but dangerously slowly).
Cheers Steve.
 

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like chaser says maf first check, turbo rubbers next, then fuel pumps ,if fuel pumps go below a certain pressure it can flash the mil lamp and is duly recorded in the memory [need a reader to confirm] but i have known them to be week and when power is needed cannot deliver :) :) :)
 
Cheers Ming for the reply but have had both pumps replaced in the last two years with genuine parts, last one was the pump on the inner wing a couple of months ago but the power shortage was there before then and thought new pump would sort it.
Also call me ignorant but what is a "MAF" sensor (main air filter?) and is it the item shown in my picture? if not is it the one at the top of the vacuum pipe in the air filter?
Cheers Steve
 
toladessip said:
what is a "MAF" sensor (main air filter?) and is it the item shown in my picture? /quote] REET Then Earthling, cannot enlarge your picture so forget that MAF sensor [mass air fingy] it measures air volume plus temp of air induction and alters fueling with its sum, its made by bosch and its crap, [no sure way of testing it] anyhows on this forum we always say dissconect it [it has a female plug] and if after dissconection it improves performance then its fooked [an easy test] faults include a= its fooked b= its outa spec low end c= high end d= its ok in the case of b or c. . . .a lot on here fit a rover rons gismo [this will kick it back in speck] or fit another type called a PIERBOUGH MAF [LOOKS THE SAME] But it has a different range spec and will only work propper with a rover rons gismo. . . . . . . .to locate it you will need to undo the air filter 4 allen screws at the back of plastic cowell, the maf is then located on the lhs of air filter looking in at engine bay. . . .dissconect plug and test [will not harm engine if left off, but will increase fuel consumsion] note TD4 ONLY :) :) :) HOPE THIS HELPS YER EARTHLING :) :) :)
Click to expand...
 
Last edited:
The Mass Air Flow sensor is located at the left end of the air filter as you look at it with the air filter cover removed. It has an electrical connection on top that you should remove and then roadtest the car.

It's function is to measure the air mass and therefore the amount of oxygen being drawn into the engine. Its output is read by the ECU and used in calculating the correct amount of fuel to be injected.

If the vehicle runs better with it disconnected (ECU substitutes a default reading) you will have to consider whether to replace it with an original Bosch unit or the cheaper Pierburgh unit and a 'Roverron Maf compensator'.
 
:DThanks Guys:D you are all geniuses, unplugged the maf sensor and my old tub turned into a ferrari by comparison. Will not get creamed pulling out of junctions anymore.
Can I leave unplugged til i get replacement? Also where do you get said replacement?
Cheers Steve
 
toladessip said:
:DThanks Guys:D you are all geniuses, unplugged the maf sensor and my old tub turned into a ferrari by comparison. Will not get creamed pulling out of junctions anymore.
Can I leave unplugged til i get replacement?
Click to expand...

Can I leave mine unplugged? Been meaning to get the sluggish speed sorted out, but have to urgently go up north and need her to fly quickly
 
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