Thread: D2a TD5 loses power at WOT on hills

Yesterday I finally had a day off and chance to get down to Justin Cooper's who connected my ride up to his Rovacom setup. He tested the MAF for me - no problem there. Then he looked at a few other screens and details for me and has pointed me to check the wiring for the turbo wastegate modulator. Big thanks to him for his time and efforts - very much appreciated!

The other big learning for the day is that this car is a known problem vehicle on here, it's previous owner also had these problems:
my D2a TD5 is a pile of dog poo!
http://www.aulro.com/afvb/discovery-...nsumption.html
http://www.aulro.com/afvb/discovery-...ption-rd2.html

I guess that serves me right for buying from a fellow AULRO member and not fully checking it all out myself. Lesson learnt.

Originally Posted by twr7cx

I guess that serves me right for buying from a fellow AULRO member and not fully checking it all out myself. Lesson learnt.

If you are buying from a fellow member it's worth doing an advanced forum search on their username. While you'll get a lot of chit chat in the results there is often enough information about the car to get a feel for any problems the car may have had and the kind of work the car has done.

I was looking at a car advertised by a member and found while the seller had made about 3 posts the previous owner had also been a member. The previous owner reported on his vanning trips, and also on the mods he'd done to the car. It was useful when looking at the D2 to have some background on what had been done.

Unfortunately it seems the car had lead a pretty hard life and had a raft of issues when inspected, so I didn't end up buying.

cheers
Paul

Today I was checking the wiring for the turbo wastegate modulator as per Justin Cooper's recommendations. Sadly no simple issue with the wiring. Maybe an internal earthing fault in the ECU?

I did find this though, which seems strange:




It's a black sheethed wire for about 25mm out of the ECU plug, then the sheeth is gone. No mention in the RAVE Manual of what this wire is for. I would assume it's an earth wire though.


Also confirmed that the engine wiring loom is not the original wiring loom. It had been replaced as the sticker gives a date of 16 May 2007:




The ECU code:



Have ordered a Nanocom and going to install a boost pressure gauge and do some monitoring and testing on that end.
Wondering if one of the Boost Boxes might fix it?

Re fuel economy, I notice from some of the links you posted, the head has been off and machined. It seems everthing that could cause these problems has been changed or checked at one time or another.

It may be worth checking the timing for accuracy. Not just by eye but with correct locking/ location tools (factory or custom makes no difference) This timing is critical and near enough is not good enough.

cheers

The pink/black wire is C0158-13 and the grey/blue is C0158-36 shown on page 43 of the wiring diagram section of RAVE. The black wire will be ground connected, and is most likely a shield to prevent interference.

Thanks to all that contributed ideas and thoughts to this problem I was having.

The problem has been solved by the fitting of a Turbo Booster Box and uprated MAF from TD5 Alive/Alive Tuning. I don't know which, or if both, devices was the solution, but all I care about is that the vehicle is good to go now!

Thanks again.

Glad you're sorted - just curious

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

If it is the modulator wiring, surely you could have made it fender spec ...

Originally Posted by DiscoJakes

Glad you're sorted - just curious

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

If it is the modulator wiring, surely you could have made it fender spec ...

Wired into the ECU plug.

Baz.