Thread: Td5 low power - fuel pump vs MAF

Hi D2Dave

Had a Disco II in the workshop about a year ago, same symptoms as yours.

it would get up to about 80km/h but feeling like getting hold back by a bungee rope.

fuel pump was dead as a stone, replaced with VDO, same as original 30% less in price.
good ever since

Richard

www.stolz-rostfrei.ch

No cat on mine Dave

Well, an update!
Today I replaced the MAF with a VDO unit and the boost modulator with the OEM Pierburg unit and hooked it all up.
And the result was......
No change
Fuel pump it is (I hope).

8 months to do those small jobs! What have you been doing all this time?

Get a wriggle on

It's called unemployment, I don't recommend it
Lack of much disposable income had me pretty disinterested in the car to be honest.
But I've got 4 months worth of 72 hour weeks doing harvest work as of monday so I should be able to get it sorted

I will be unemployed soon. 5th of Jan to be exact.

Originally Posted by d2dave

I will be unemployed soon. 5th of Jan to be exact.

do the td5 issues start at the same time?

You can rule out the pump before you buy one if you remove the FT sensor and screw in a pressure gauge instead of it... if the HP stage of the pump is gone you'll not get above 1 bar there, or if it's only partially dead maybe more but below 3 and the symptom is low power... if you get 4 bar pressure there the problem is not the pump so you can save some money... another way of checking the pump but this is not always relevant is by measuring it's current draw, remove the fuse (F10 engine bay) and close the circuit with mutimeter set to 20A, if you'll get below 10 A with pump running(the lowest the worst) then it's 100% fubar'd(seen this myself 3 times) though even if the current draw is good(around 15A) doesnt mean that the pump is 100% good but in most cases it is

if you have nanocom read the ambient pressure, inlet air temp and manifold pressure to rule these out cos any of these sensors can cause low power without throwing a fault code