I would welcome some advice with a problem on my rather old 2.5td auto. It is failing to accelerate when I put my foot down. It is rather flat when pulling off and has little throttle response until 5 seconds later when masses of power comes in. There are no warning lights showing.

Firstly, I would like to know of a fault code reader and manual that I could buy that would help check the data stored in the ECU. Secondly has anyone any ideas concerning this problem and its rectification.

Many thanks CF

When did it last have all its filters changed????? especially the diesel and air filter.

Check the hose from turbo to intake hasn't gone soft....

Need a good code reader - cheapo tech2 doesn't read it iirc

Is it an auto? If so, check the gearbox oil...

Dazzler wrote on 26. Sep 2007 at 20:52:

When did it last have all its filters changed????? especially the diesel and air filter.

Thanks but all filters renewed as per service schedule - less then 1k miles ago.

IrmscherKris wrote on 27. Sep 2007 at 00:21:

Is it an auto? If so, check the gearbox oil...

Thanks - Have checked the oil - that's OK. No change to the problem so its an engine fault problem.

How much fuel have you got in the tank?????

Fuel just over half full!

may be worth bleeding it, but I'd expect it to idle erratic if air in there....

not quite sure of the problem here, if you have masses of power after 5 seconds or so then would guess the turbo has kicked in, below about 1800 rpm they are slightly flat, although not to bad should be a gradual urge building with an auto, from your description it sounds lke it all of a suden shoots off?  more info please?

Hi

After hours of looking at wiring diagrams and testing bits The problem was found to be the air temperature sensor in the plenum chamber. It was caked in oil and grease and so unable to function properly. No warning lights or fault codes showed because the problem was not the failure of the sensor.

Cleaning inside the plenum chamber is a real task should anyone feel tempted - it fouls the bulkhead and so is an impossible task without removing the rearmost four studs. I now understand why this particular task has never been completed previously.

CF wrote on 01. Oct 2007 at 19:15:

Hi After hours of looking at wiring diagrams and testing bits The problem was found to be the air temperature sensor in the plenum chamber. It was caked in oil and grease and so unable to function properly. No warning lights or fault codes showed because the problem was not the failure of the sensor. Cleaning inside the plenum chamber is a real task should anyone feel tempted - it fouls the bulkhead and so is an impossible task without removing the rearmost four studs. I now understand why this particular task has never been completed previously.

There is a knack to getting these off.  I can do it very quickly, due to excessive practice  ::)