Thread: D2a TD5 loses power at WOT on hills

Originally Posted by discowhite

i offered you every chance to take the car to what ever mechanic you wanted to look the car over before you bought it.
i also answered every one of your questions honestly.
and the fact of the matter with this car...nobody knew what was wrong with it... i could drive it and it could be good or bad others would drive it and it was good. you drove it and didnt have any problems.
a well known LR mechanic had looked at the car and said that there was nothing wrong with it and that everything that ide done/replaced on it was exactly the same thing he would have done.

eitherway glad its sorted now..

cheers phil

Phil, I haven't blamed you. If I had, or had a problem with you personally, you would know about it as I would have spoken directly to you. My statement was that it was MY (me, not you) bad for not reading about the vehicles history on here. You are correct that you were not required to disclose the fuel issue to me - at the end of the day you were a seller trying to get the best price you could and I was a buyer that as you pointed out had the opportunity to test it out and get it checked out (although realistically unless I test drove it for 500kms I still wouldn't have known about the bad fuel economy nor would a mechanic have been likely to identify it).

Either way, I think we can leave it there as it's better now. The power issue is 110% fixed and it's pulling harder now than it was when I first got it. The fuel economy has improved too, but is still not were it should be.

Originally Posted by DiscoJakes

Does the booster box wire into the MAP sensor or wastegate modulator wiring ?

Taps into the wiring loom plug that plugs into the ECU. I believe the wire is the wire from the MAP sensor.

Thanks for that, I've pretty much done the same with a voltage regulator to "fool"the ECU by only supplying 4.5Volts to the MAP sensor. Works, but you need a Madman/boost gauge inside to monitor and alarm.

A thank you to mturri for the inspiration to make something similar to his design for checking fuel pressure problems.
My pressure testing device is made from VDO components. The response from these is dampened but their accuracy seems good.
How I think the Fuel regulating system on the TD5 EU3 engine functions.
The fuel from the High Pressure outlet of the pump is feed through the body of the regulator and into the Metal mesh filter in the head. (No action is performed on the fuel by the regulator at this point). The vast volume of fuel is not used by the injectors and returns to the regulator, this is where the regulator acts on the fuel to regulate the upstream fuel to 4 bar. The fuel then flows to the fuel cooler before returning to the tank. The only pressure in the line downstream of the regulator is the restrictions of the line and whatever happens in the main fuel filter.
I installed my pressure measuring device in the line which runs from the front of the head and returns to the regulator. Without the engine running but with the fuel pump working the pressure was approximately 3 bar. When the engine was started this increased to 4 bar. I cannot explain this, possibly vibration having an effect on the regulator. When driving I did not notice any change from 4 bar, but this may be due to the slow response of my measuring equipment.
I am thinking of making an adapter to measure the inlet fuel pressure at the fuel temperature orifice on the regulator.( the fuel inlet and the temperature sensor share a common gallery) This will give an indication of the resistance offered by the metal mesh filter in the head.
Clean the mesh, observe the pressure upstream of the mesh. As the mesh becomes blocked the pressure at the temperature sensor orifice will increase. Experience will then determine when the mesh needs cleaning.

Well done. I wait with bated breath for further comments from the gurus here (so many).
I don't have access to my info at the moment, but can some one advise - doesn't the Nanocom Evo measure one or more of these?

Some photos
http://www.aulro.com/afvb/members/ha...ure-sender.jpg
http://www.aulro.com/afvb/members/ha...-vdo-gauge.jpg
http://www.aulro.com/afvb/members/ha...vdo-sender.jpg