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Nigelpugh7

Member Since: 18 May 2018
Location: Solihull
Posts: 115

New to me TD5, but seems down on power.

Hi Guys,

We’ve just acquired this 90 TD5, it’s been used for some proper off roading in its life, but we bought it to work at our off road experience centre.

It’s not perfect, needs some work, Rhe simple jobs we can do, and have done some of them already like a simple service Including all oils and filters.

However here’s the issue, it seems way down on power, and we need to work out what the issues are.

Now here’s the challenge, the previous owner, had no knowledge or experience of the mods done to the car.

The car is fitted with a remote ecu loom.

It’s also fitted with a dastek ecu mod, that piggy backs with the remote ecu and loom.

As with all 2001 vintage TD5 engined defenders, it suffers with the oil in the loom issue.

We have cleaned our all plugs , and this has got rid of some of the misfires.

However it still hesitating on pulling away, and has a mid range misfire too.

We will lool at tests the maf and other sensors, but they all look clean.

However it’s also fitted with a electronic “ diesel dump valve “ which is in the intercooler pipe, and I suspect the cause of a lot of problems too.

Should we just get rid of it?. I don’t see the advantage of it at all?

We will also check the waste gate activation, but what else should we be checking?.

Thanks in Advance.

Nige.

Click image to enlarge

4th Jun 2018 6:25pm

GREENI

Member Since: 22 Aug 2010
Location: staffs
Posts: 10381

First things first, put a quality new MAF sensor on it. Then go from there.

Welcome too

4th Jun 2018 6:53pm

bankz5152

Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2166

Get rid if the piggy back and get it mapped properly.

Get rid of the diesel dump valve for whatever ridiculous reason its in there for.

New Genuine MAF Sensor - Gen LR - Siemens or VDO only. The rest are pants

Clean the MAP Sensor - On the inlet manifold

Check the air filter isnt blocked

4th Jun 2018 6:57pm

Nigelpugh7

Member Since: 18 May 2018
Location: Solihull
Posts: 115

Re: New to me TD5, but seems down on power.

Unnecessary quote removed

Thanks for the welcome, have been active in the discovery 4 and and fullfat Range Rover forums, but been a whilst since we have had a defender like this to play with!

4th Jun 2018 7:01pm

Nigelpugh7

Member Since: 18 May 2018
Location: Solihull
Posts: 115

GREENI wrote:
First things first, put a quality new MAF sensor on it. Then go from there.

Welcome too

Yep that’s ar first thought too!

I think a new Genuine Maf will be the first purchase of course..

We have done a full Genuine filter and oils replacement already, so fuel filter, both oil filters, and of course air filter too..

4th Jun 2018 7:04pm

mk1collector

Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769

Just unplug the maf and drive it about to see if some power comes back, if it does you need a new one. Ray
My build thread
http://www.defender2.net/forum/topic17615.html

4th Jun 2018 7:24pm

Nigelpugh7

Member Since: 18 May 2018
Location: Solihull
Posts: 115

That’s our first thing to check in the morning, but thanks for the pointer!

4th Jun 2018 7:43pm

Nigelpugh7

Member Since: 18 May 2018
Location: Solihull
Posts: 115

Quick question of the diesel dump Valve if I may experts?

As it seems to be piggy backed with the Genuine Land Rover air control valve, what should the standard pipe routing look like?

Anyone point me to the std layout please?

Also as the valve, ( I assume it’s a BOF type) is in the intercooler pipe, will disconnecting it suffice, or do I need to buy a new pipe too?

If a new pipe is in order, shal,we just get a complete new set of silicone hoses for the intercooler and turbo?

The reason I ask, is I’m sure I can hear hissing, hence air leaks form some where?

4th Jun 2018 7:49pm

Retroanaconda

Member Since: 04 Jan 2012
Location: Scotland
Posts: 2645

Those ridiculous tyres will sap a fair bit of power.

4th Jun 2018 8:12pm

gazman

Member Since: 17 Aug 2015
Location: Liverpool
Posts: 652

Check the boost pressure of the turbo. Too high will cause problems as will it being low 2014 - current ..... 2003 defender td5 90 (my car)
2009 - current .... 2005 zx10r

5th Jun 2018 10:33am

MJN110

Member Since: 18 May 2015
Location: North Yorkshire
Posts: 380

2016 Defender 90 Puma 2.2 Landmark LE Montalcino Red

Yes definitely check the MAF, just because it looks clean does not mean it is working. 2016 Defender Landmark 90
2005 Defender CSW TD5 90XS

5th Jun 2018 11:08am

Nigelpugh7

Member Since: 18 May 2018
Location: Solihull
Posts: 115

Right guys, quick update from this mornings playing with bits.

I disconnected the MAF and it has made no difference whatsoever, no increase in performance, but no decrease either.

Checked the power feed and ground on the MAF cable, all good.

Checked the ecu return voltage with the plug reconnected to the MAF, only a few milivolts reading.

So I think that looks like the maf is shot so will get a replacement one ordered.

Also tried plugging turbo valve pipes, at tbothr valve in the intercooler pipe, and the control block too.

That has now stopped the stupid hissing and boy racer Valve noise, so I think we can agree that’s got have not helped, so I will replace the intercooler hose and get rid of the value and controller all together.

Thanks for the pointers so far!

5th Jun 2018 11:11am

Nigelpugh7

Member Since: 18 May 2018
Location: Solihull
Posts: 115

Right, another update now after some further investigation and fettling!

It turns out we were down on boost pressure as that stupid turbo dump valve was letting all the pressure out at the point where it was Inserted in to the pipe.

So a new intercooler pipe, and removal of the control valve and the car feels like it has twice the power.

A quick test of fault codes using Auto Logic Diags revealed loads of air flow sensor faults.

So fitted and brand new Genuine Land Rover MAF, and now the engine pulls cleanly even from very low revs.

All in all a massive improvement.

There is still the occasional hiccup when I’m in 5th at about 60 mph, on a constant throttle, there is a blip and it feels like the revs increase on their own for a short burst.

We still feel like the dastek power box is not helping,,and think it might also be over fuelling the engine.

Next thing to try is to remove that all together and just run with the std rover ecu, to see how iit performs then.w

Thanks again for the advice and pointers so far.

5th Jun 2018 3:26pm

NickMc

Member Since: 01 Oct 2014
Location: Norn Iron
Posts: 1624

May I suggest this special tool for your tuning box:

Click image to enlarge

5th Jun 2018 5:06pm

Nigelpugh7

Member Since: 18 May 2018
Location: Solihull
Posts: 115

That does indeed seem like the best suggestion!

5th Jun 2018 5:47pm

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