Thread: TD5 at a loss, power that is

Just unplug it and see if vehicle runs better

Mine did this last March 2013 just after I bought it, and there is a thread where I downloaded the run data and Dougal interpreted it as a dud(overreading) MAF. In my case there were no errors recorded.

Mine would rev to 3900RPM at full accelerator, then go into a big miss as the MAF voltage at the ECU dropped to zero.

New MAF and no problems since.

My fuel economy was OK at 11.4 , although it was only around town at small accelerator.
Regards Philip A

Just took car for a run with another maf. Ran a lot better, so given mine a clean with electrical contact cleaner. Let you all know the results. (Probably a new maf being required)


Cheers

For what's it is worth, and you maybe on top of this now, but try pulling out (and by that I mean carefully unscrewing) the MAP sensor in the intake manifold. They can get gunked up, especially if you still have the EGR on. Give it a clean with something like MAF cleaner.

When I was chasing similar problems on my TD5 it helped (along with a new MAF) .

Hope you get to the bottom of it.

Ian.

Big D - out of interest - do you have an auto or manual? Disco or defender? EU2 motor or EU3 with NNN ECU? EGR bypassed or still connected?

Originally Posted by PhilipA

Mine did this last March 2013 just after I bought it, and there is a thread where I downloaded the run data and Dougal interpreted it as a dud(overreading) MAF. In my case there were no errors recorded.

Mine would rev to 3900RPM at full accelerator, then go into a big miss as the MAF voltage at the ECU dropped to zero.

New MAF and no problems since.

My fuel economy was OK at 11.4 , although it was only around town at small accelerator.
Regards Philip A

Where did you find the run data for Td5 I am getting a nanocom reader soon, thanks

Its a long time now but I think its under "instruments" and you can save it to an SD card in real time.
A couple of flat out runs will show.
Dougal may remember better than me.
Regards Philip A

Some additional information to fill in the gaps:

Discovery 1999
E2 emission standards, still running ERG
Auto transmition

Diagnostics using original Nanocom, so engine fuelling data is stored in the unit and downloaded later.

Yet to clean the MAP, but that will have to wait for the weekend.


When I downloaded the data after swapping MAF, there was still the occasional "drop to 0"under full power, but for a single time step, compared to my MAF that had the 0 over several time steps. The car still ran markedly better.