2003 TD5 Discovery running problem

Hi,

Im having a issue with my 2003 TD5 discovery. To put it simply the vehicle refuses to rev above 3000rpm. It doesnt matter how hard you push the peddle it just sits there and what feels like mis-firing.
I have checked the following:
I have checked that the wastegate is free and is working (using a hawkeye)
the turbo wastegate modulator is working (tried a test and tried another unit) and checked the pipes
The airflow meter is recording figures
the throttle pot is working (using diagnostic)
new fuel filter has been fitted.
air filter is ok and intake pipes are clear
the looms are free of oil
cleaned the base of the fuel pump of dirt in the tank

Can anyone think of anything that will cause the problem? It drives very well otherwise.

Many thanks,
Hugh

Rightio,
I have done some experimenting using a hawkeye and a few other bits.

Following on from comments I checked the boost regulator using the hawkeye and with another known unit. There were no other errors on the ECU apart from a injector trim data error which will not clear. MAF is ranging up from idle. MAP is measuring and changes with revs. Coolant temp ok. Air temp ok. EGR tested ok but didnt change with revs.

Firstly I took the fuel tank pump out and apart again to find that the internal filter was simply full of a black sludge. I didnt do ths before. I eventually cleaned this out (with petrol) and put it back together and rebled the system. No change

I then went and looked at the Fuel pressure regulator and cleaned the filter out and then discovered that someone had put the pipes back onto it the wrong way round. So the feed to the cooler was in the top hole rather than the bottom. I swapped this around.

I went for a spin and the fuel filter at the back by the wheel was stone cold.

I replaced the fuel pump with another known good unit as I was concerned with the amount of sludge I found after the filter. No change

I changed the FPR for another known unit and the vehicle is vastly improved but the problem is still there

The rear fuel filter is now hot after a short run (3-5 miles).

I also cleaned the air sensor in the airbox.

Can anyone shed any other insights?

Something someone has mentioned on another forum is is the High/low switch ok? I do remember seeing on the hawkeye that security didnt stay stable (High/low flickering). Has anyone else any thoughts on this and what it relates to? http://www.aulro.com/afvb/editpost.php?do=editpost&p=2255129

if your egr is still connected, clean the map sensor in the inlet manifold, then better still ditch the egr

Opps forgot to add that. I cleaned the Map and MAF sensor too.

I take it it's an auto gearbox? Have you any leaks around the box, you could be low on oil?
Cheers.

might be a clogged CAT too

sierrafery said:

might be a clogged cat too

Click to expand...

+1