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davec

Member Since: 09 Sep 2015
Location: Devon
Posts: 8

loss of power

Hi all,first post.
A mate is having a problem with his Td5.The problem being is that it will tick over fine but will lose power after only a couple of miles and cut out.When this happens it takes a short while before it will start again.During this period of non-starting one thing he notices is that the fuel guage drops to zero when cranking.He returns home with it as it seems pointless driving any further at the moment.
Things he has tried so far,
Changed fuel pump and pipes
main wiring loom
pump relay
I've told him i'll try this forum for advice before he goes any further.
Help and advice would be greatly appreciated.

Many thanks in advance.

Forgot to mention it's on a '53 plate.

9th Sep 2015 6:52pm

bob neville

Member Since: 30 Apr 2009
Location: Marbella
Posts: 3248

On my 2001 TD5 the fuel gauge will drop to zero when starting if the battery is low.

Check battery state and the battery connections and earth.

Also check for oil in the ECU loom (unless that is what you meant about changing the main loom ?)

TD5's do not like low batteries !

Bob 2015 Jaguar XE240 R Sport - goes like ....... !!
2013 Defender 90 CSW - sold
2009 Defender 110 Double Cab - sold
2001 TD5 90 CSW - offroad project - sold to a forum member
2011 Porsche Boxster - for the sunny days !

9th Sep 2015 7:10pm

davec

Member Since: 09 Sep 2015
Location: Devon
Posts: 8

Thanks for the reply Bob.The loom was changed in the hope the fault would clear.I'll mention about the fuel guage/battery link.It just seems strange that it cuts out after a couple of miles,as if a component is breaking down under load?

9th Sep 2015 7:32pm

bob neville

Member Since: 30 Apr 2009
Location: Marbella
Posts: 3248

Did he pull the red plug on the ECU and check for oil ?

Also, the crank sensor may be shot and/or missing it's spacer or not even connected ?

Turbo waste gate actuator may also be stuck.

All easy to check and fix.

Bob 2015 Jaguar XE240 R Sport - goes like ....... !!
2013 Defender 90 CSW - sold
2009 Defender 110 Double Cab - sold
2001 TD5 90 CSW - offroad project - sold to a forum member
2011 Porsche Boxster - for the sunny days !

9th Sep 2015 7:44pm

davec

Member Since: 09 Sep 2015
Location: Devon
Posts: 8

No oil around the red plug.I will mention to him what you've suggested and post if successful or not.
Thanks very much for your help.

9th Sep 2015 8:35pm

JWL

Member Since: 26 Oct 2011
Location: Hereford
Posts: 3443

How about the ecu earth plus its integrity back to the battery?

Reading it again I would put money on the injector seals and washers. Replace them with quality ones and see what difference that makes.

9th Sep 2015 8:46pm

davec

Member Since: 09 Sep 2015
Location: Devon
Posts: 8

Thanks very much,added to the suggestion list.

9th Sep 2015 8:53pm

davec

Member Since: 09 Sep 2015
Location: Devon
Posts: 8

Still got the problem.The ECU has now been away to be checked.Can we just assume that this is ok so we can look into other possible causes rather than me posting tomorrow night saying it hasn't improved as I'm able to help in the morning.
Many thanks in advance for any suggestions.

28th Sep 2015 5:50pm

Dpgdefenders

Member Since: 11 Nov 2014
Location: North Yorkshire
Posts: 9

Have you run a separate new Earth from the ecu Earth terminal stud to the battery neg terminal? Sounds bad earthy.

29th Sep 2015 8:28pm

davec

Member Since: 09 Sep 2015
Location: Devon
Posts: 8

I'll do that,we're getting desperate now.Mate's nearly bald,pulling his hair out.

29th Sep 2015 8:58pm

JWL

Member Since: 26 Oct 2011
Location: Hereford
Posts: 3443

As a bit of a curveball, the guage dropping may be a bit of a red herring as the guages will drop when cranking as the circuit is cut much the same as your radio will go off when cranking. It may be the age old injector seals and washers and not an electrical thing after all. Well worth doing if they haven't been changed for a while.

29th Sep 2015 9:13pm

davec

Member Since: 09 Sep 2015
Location: Devon
Posts: 8

He changed all the relays,4 yellow,2 black and it's running.I can only think that he may have changed the wrong relay thinking that he'd done the one for the fuel pump.
By changing them all,this time he did swap it.
It is running,as I've mentioned,but, it needs the accelerator pedal to the floorboard before it picks up.
Thanks to everyone who commented and any further thoughts would be appreciated.

1st Oct 2015 6:05pm

JWL

Member Since: 26 Oct 2011
Location: Hereford
Posts: 3443

Personally, I'd still be looking at replacing the injector seals and washers.

1st Oct 2015 8:41pm

davec

Member Since: 09 Sep 2015
Location: Devon
Posts: 8

I'll suggest it to him,thanks for reply.

1st Oct 2015 8:51pm

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