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adseybear

Member Since: 08 Oct 2009
Location: Vancouver, Canada
Posts: 260

Td5 issues

I’ve struggled for a while for anyone to be able to put their finger on what my issue might be.

In short, I have a 2003 Defender 90 CSW, with a safari snorkel and mt’s. It has had the EGR removed and otherwise is completely stock.

It now has 116k miles on it, I purchased it with 40k. I’ve noticed for a while now, that strangely on some days it seems down on power. Whilst not highly scientific, I travel quite a long dual carriageway route every day, and on the same quite steep hill, it will sit at 75 some days, others drop to 70. Im sure even once it wanted to accelerate at 75...

Some days when im in a hurry (on a private road of course) she wont really want to get passed 80, yet others she sits comfortably at 85.

I notice it on the days it seems to be running well as it just seems to rev much smoother up to the top end. Add in that sometimes it'll knock slightly on idle.

I accept that fitting mt’s would’ve dropped fuel economy, but even being relatively careful, most of the time I’m struggling to achieve 24mpg, yet on days where I’ve done a lot of driving and she seems to be running better, I’ve filled up and got 26+mpg.

Any ideas?

Diagnostics havent shown anything, had a new MAF recently and cleaned the intake sensor 2003 Defender 90 Td5 CSW Belize Green - "Betty"
1958 Series IIA 109 Station Wagon - "Randolph" - Awaiting Restoration
2019 Jeep Wrangler JL Rubicon - SOLD
2006 Volvo V70 D5 - Ocean Race Edition, SOLD
2003 VW Passat Estate 1.9TDI - SOLD
2008 BMW 320D M Sport Estate - SOLD
2001 Defender 90 Td5 Hard Top - SOLD

10th May 2013 10:07am

appaloosadude

Member Since: 17 Oct 2012
Location: Buckinghamshire
Posts: 630

I'm watching this as seem to suffer similar issues, sometimes a thoroughbred, sometimes a cart horse...

10th May 2013 10:11am

Laurie

Member Since: 22 Feb 2008
Location: Sussex, England
Posts: 2897

2005 Defender 90 Td5 XS CSW Bonatti Grey

It's been very windy lately.
Have you taken wind direction into account?
This is no joke, it really does make a difference.

10th May 2013 10:16am

mk1collector

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

I wonder if air pressure makes a difference as at altitude it makes a massive difference to performance. It may be worth Making a note of the weather conditions on the days you notice a difference or having a barometer in the car?

10th May 2013 11:28am

Laurie

Member Since: 22 Feb 2008
Location: Sussex, England
Posts: 2897

Altitude shouldn't make a difference to a turbo.
Seriously affects normally aspirated diesels.

10th May 2013 11:33am

mk1collector

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

I meant the air pressure at altitude

Edit: just reread your comment and didn't realise there would be a difference with being a turbo'ed engine

10th May 2013 11:35am

barbel jim

Member Since: 12 Dec 2012
Location: Northants
Posts: 1428

Humidity will make a difference, as altitude due to the denseness of the air, but the effects I would have thought would be negligible and unnoticeable on standard engine.
I would check all the turbo pipe work.

I had something similar a few years ago, which turned out to be a busted jubaliee clip on the intercooler

Have you checked for a sticking wastegate, oil in the loom ??

10th May 2013 11:45am

adseybear

Member Since: 08 Oct 2009
Location: Vancouver, Canada
Posts: 260

no oil in the loom,

and I totally understand your point laurie and do notice wind playing a part at higher speeds, but doesnt explain it not running as smoothly. 2003 Defender 90 Td5 CSW Belize Green - "Betty"
1958 Series IIA 109 Station Wagon - "Randolph" - Awaiting Restoration
2019 Jeep Wrangler JL Rubicon - SOLD
2006 Volvo V70 D5 - Ocean Race Edition, SOLD
2003 VW Passat Estate 1.9TDI - SOLD
2008 BMW 320D M Sport Estate - SOLD
2001 Defender 90 Td5 Hard Top - SOLD

10th May 2013 1:06pm

ajps72

Member Since: 08 Jan 2012
Location: Lima Peru
Posts: 105

Re: Td5 issues

I had a similar issue and I change the radiator and hoses and now the power is back, I believe that the problem was that the radiator was clogged and the temperature rise making the engine less efficient, I measure it with my Nanocom (before it broke) and it use to go up to 105C now it hardly goes more than 85C. Augusto

Defender 110 TD5 2001
Discovery 4 TDV6

10th May 2013 1:45pm

diesel_jim

Member Since: 13 Oct 2008
Location: hiding
Posts: 6104

Air flow meter on its way out?

On days that it doesn't drive well, try unplugging it and see if the power "reappears"

10th May 2013 1:54pm

adseybear

Member Since: 08 Oct 2009
Location: Vancouver, Canada
Posts: 260

had a new radiator and intercooler a year ago (had a bit of an oopsie with an oncoming d2)

recently had a new MAF too. 2003 Defender 90 Td5 CSW Belize Green - "Betty"
1958 Series IIA 109 Station Wagon - "Randolph" - Awaiting Restoration
2019 Jeep Wrangler JL Rubicon - SOLD
2006 Volvo V70 D5 - Ocean Race Edition, SOLD
2003 VW Passat Estate 1.9TDI - SOLD
2008 BMW 320D M Sport Estate - SOLD
2001 Defender 90 Td5 Hard Top - SOLD

10th May 2013 2:04pm

diesel_jim

Member Since: 13 Oct 2008
Location: hiding
Posts: 6104

adseybear wrote:
recently had a new MAF too.

Since the problem occured? sometimes new MAF's can go duff.

10th May 2013 2:19pm

adseybear

Member Since: 08 Oct 2009
Location: Vancouver, Canada
Posts: 260

Yeh, its definately not MAF related 2003 Defender 90 Td5 CSW Belize Green - "Betty"
1958 Series IIA 109 Station Wagon - "Randolph" - Awaiting Restoration
2019 Jeep Wrangler JL Rubicon - SOLD
2006 Volvo V70 D5 - Ocean Race Edition, SOLD
2003 VW Passat Estate 1.9TDI - SOLD
2008 BMW 320D M Sport Estate - SOLD
2001 Defender 90 Td5 Hard Top - SOLD

10th May 2013 2:25pm

TD5_dan

Member Since: 24 Feb 2012
Location: Essex
Posts: 449

Mine is very similar never that noticeable in terms of lack of speed but some days just seems to have a few more bhp than another. I actually put it down to weather and air temps/ air pressure. Mine has 46k on the clock, new injector loom, well serviced. Never actually seen what it drives like with maf disconnected. 2001 TD5 110 County Station Wagon - sold
1970 Series 2A Station Wagon
1970 Series 2A hard top
1960 Series 2
1972 Series 3

10th May 2013 3:41pm

Nick T

Member Since: 29 May 2011
Location: Bolton
Posts: 203

2010 Defender 90 Puma 2.4 HT Galway Green

Mine is the same. Safari snorkel etc.. Done all the usual suspects. Can be dangerously slow at pulling out in traffic-then goes like a flying machine????

10th May 2013 5:16pm

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