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freddie206

Member Since: 18 Oct 2015
Location: Skipton
Posts: 90

TD5 intermittent non start

2006 TD5 no previous starting issues.

Stopped at the shops on the way home yesterday and when I went to start up it was having none of it.

When I turned on the ignition I was only getting the oil pressure, battery and handbrake warning lights and not the engine management and glow plug lights. The fuel pump also wasn't running. I checked the fuel pump fuse which was fine. After scratching my head for a bit I thought I'd give it another go and it fired up straight away after all the correct dash lights illuminated.

Any suggestions as to where I should start my search? An intermittent fault is definitely one of the most frustrating!

26th Sep 2022 7:27am

Penfold_6290

Member Since: 22 Sep 2021
Location: Dorset
Posts: 319

Take a look at the fuel pump relay (under the seat, the one on the right as you look at them through the door) and the socket it sits in. A bad contact here is a potential cause for poor starting.

26th Sep 2022 9:16am

rallysteve

Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2227

2002 Defender 110 Td5 DCPU Keswick Green

Likewise the main relay which is next to it.

Steve 02' 110 TD5 Double Cab Rebuild Thread

26th Sep 2022 9:37am

freddie206

Member Since: 18 Oct 2015
Location: Skipton
Posts: 90

Thank you both for the suggestions. I’ll take a look into those.

Im leaning more towards a fuel pump issue because I always get power when switching on the ignition and the engine will turn over.

26th Sep 2022 11:46am

rallysteve

Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2227

You mention you didnt get the engine managenent/glow light when it wouldnt start. The main relay powers the ECU and the ECU controls the fuel pump relay.

Also worth checking the ECU earths as they are prone to cause issues

Steve 02' 110 TD5 Double Cab Rebuild Thread

26th Sep 2022 11:54am

4RF RDS

Member Since: 19 Jul 2015
Location: Ottawa
Posts: 933

2000 Defender 110 Td5 XS CSW Epsom Green

Starter solenoid contacts wear out and require a rebuild. If it happens again and the other suggested fixes don’t cure it. Look into that

2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam)
2000 Defender 110 CSW TD5 (CTX)
1992 Range Rover Classic (Lizzy)
1972 Series III 300 Tdi (Stanwood)
1967 MGB GT

Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats.
H. L. Mencken (1880 - 1956)

27th Sep 2022 5:54pm

freddie206

Member Since: 18 Oct 2015
Location: Skipton
Posts: 90

The engine always turns over so I’m not sure it’s a starter motor issue but I will bare that in mind for future reference.

I have just added a Rev counter which obviously meant tapping into the instrument loom. Perhaps I should take another look at my splices. Would a faulty connection on an earth there have knock on effects?

27th Sep 2022 7:36pm

4RF RDS

Member Since: 19 Jul 2015
Location: Ottawa
Posts: 933

Well defo not starter solenoid then

27th Sep 2022 7:40pm

cocker

Member Since: 23 Sep 2021
Location: Merseyside
Posts: 38

Had this problem and it was the relays under the driver’s seat bad contact cleaned up and cable tie did the trick

28th Sep 2022 7:02am

freddie206

Member Since: 18 Oct 2015
Location: Skipton
Posts: 90

So the main relay powers the ecu which in turn powers the fuel pump and glow plug relays?

28th Sep 2022 8:17am

Screbble

Member Since: 26 Apr 2015
Location: Lancashire
Posts: 2102

2004 Defender 90 Td5 XS CSW Zambezi Silver

Yes that’s correct I think.

There is an inertia switch in line with the main relay - brown cable to the main relay coil (86) and the orange/brown cable from the main relay normally open contact (87) feeds the relay coils (86) of both the glow plug relay and fuel pump relay.

Hope that helps.

28th Sep 2022 6:56pm

geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410

Just thought I would weigh in here, this all sounds very familiar to Miffy and I

I would urge you to check the internal contacts of your relays, page 13, last post of the Miffy thread shows how pitted they can become. This was a cause of my intermittent starting.

https://www.defender2.net/forum/topic53859-180.html

28th Sep 2022 7:58pm

freddie206

Member Since: 18 Oct 2015
Location: Skipton
Posts: 90

Thanks to all who contributed ideas.

I checked the relays under the drivers seat and they both looked clean but since then I haven’t had any issues so perhaps a good wiggle was just what they needed!

Onto a new problem now…

14th Oct 2022 4:55pm

rallysteve

Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2227

Excellent, if that is the case it is worth trying to close up the crimp terminals in the relay holders so they are a tighter fit onto the relay terminals

02' 110 TD5 Double Cab Rebuild Thread

14th Oct 2022 4:58pm

Dtes

Member Since: 01 May 2022
Location: Staffordshire
Posts: 10

Next time it happens give the main relay another wriggle, odd’s are it’s that.

The ecu earth wire and inertia switch can also case the same problem

16th Oct 2022 11:14am

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