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Dr Phibes



Member Since: 24 Apr 2024
Location: Melbourne
Posts: 33
Australia 
Defender 15p not starting
Hi,

I'm having non-starting issues. Cranks but doesn't fire. It used to start first crank every time.

In terms of what's changed recently, I put a diesel fuel system cleaner additive in. Actually ran better. Makes me suspect a blockage.


I have:

    * Noticed that fuel pump doesn't always self-prime, as it used to. Forcing priming (5 presses on accelerator) works every time. Suggests relay is OK?
    * Confirmed no error on nanocom. Also tested fuel pump, injectors, crank posn sensor - seemingly OK.
    * Removed blocked fuel filter air bleed valve - another on the way. Even before I did this I could feel fuel flowing through all the pipes and hoses (e.g. fuel cooler)
    * cleaned MAF
    * Replaced fuel filter
    * confirmed no oil in ECU plug (never has been)
    * confirmed ECU earthed OK
    * confirmed that I get RPM while cranking, via tach and nanocom - although only ~200RPM. I read somewhere this needs to be over 300?


Batteries are fine - I have 2.

I'm going try testing/changing the crank sensor next (and wiring). And then testing resistances, amperes etc. I have a fuel pressure test kit coming.

It's not in a position where I can bump start.

Will also check pump once I have cut a hole in the floor (as I have a long range tank, towbar etc)...

I can't imagine all the injectors have blocked? Ultimately will check if needed.

Any other ideas?[/list]
Post #1053526 1st Dec 2024 7:32am
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5707
2006 Defender 110 Td5 USW Zermatt Silver
Does it start every time after a fuel prime?

If yes then possibly injector seals.

If you don’t hear the relay each time you turn on the ignition check terminals on fuel pump relay.
Post #1053534 1st Dec 2024 9:01am
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Dr Phibes



Member Since: 24 Apr 2024
Location: Melbourne
Posts: 33
Australia 
It isn't starting at all, no ignition whatsoever. It usually only primes when I trigger a purge. Otherwise only every tenth attempt or so...
Post #1053537 1st Dec 2024 9:17am
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Hazza



Member Since: 10 Jan 2011
Location: North Yorkshire / Leeds
Posts: 215
United Kingdom 1990 Defender 110 Td5 HT Bronze Green
Pretty sure the Nanocom lets you test injectors? I.e. you can 'fire' them remotely, listening for a click? Would be good to confirm that there's communication from ECU to injectors.

You could try a bit of easy start, will just confirm that you have compression and timing, and will then pinpoint that the issue is fuel (supply or injection). 1990 Defender 110 200TDI Camper - now converted to Td5 power
Post #1053646 2nd Dec 2024 12:50pm
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TexasRover



Member Since: 24 Nov 2022
Location: Paris
Posts: 1060
France 2002 Defender 110 Td5 DCPU Chawton White
If you have priming issues I suggest you look at that again. Fuel pump or relay can be going out. I had an issue where the engine was running but after I disconnected the fuel line I could not get it to prime again.

Pump was running but not pumping. Was pretty clear as with the fuel lines disconnected at the cooler and the pump priming there was just a dribble coming out.

Had to do the ritual and chop the hole in the rear floor to change the pump. Made a nice hatch that should have been there from the start.

After pump change there was as strong flow that filled up a water bottle in no time.
Post #1053647 2nd Dec 2024 1:15pm
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Dr Phibes



Member Since: 24 Apr 2024
Location: Melbourne
Posts: 33
Australia 
Thanks. Those are good suggestions.

I have tested the injectors, they are OK according to the nanocom.

I also changed the crank sensor. The cranking RPM doesn’t get over 210, I have read it needs to be over 300? Denso starter on order.

I will try easy start and cutting the floor to get to the pump - was always going to do that anyway. Has anyone tried to replace the pump motor? I will probably shell out for a VDO one but would like to keep a spare.
Post #1053680 2nd Dec 2024 8:07pm
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MadTom



Member Since: 10 Sep 2013
Location: Olomouc
Posts: 623
Czech Republic 1999 Defender 130 Td5 HCPU Baltic Blue
With Nanocom check, it the engine ECU is not imobilized. It is in the last menu.
If not, there could be problem with in tank fuel pump. Before remowing it from tank, you can measure supply current to pump, measuring at the fuse. And also measure fuel pressure, it shoulb be 4 Bar. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo Smile
Post #1053690 2nd Dec 2024 10:16pm
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Dr Phibes



Member Since: 24 Apr 2024
Location: Melbourne
Posts: 33
Australia 
Thanks, will do.

However I have successfully removed the 10AS and modified the ECU. Have done 100s of Ks since. And it wouldn’t crank if immobilised.

On a related point I pushed the rollover inertia switch and could have sworn it clicked! Made no difference to starting though.

My gut feel is it’s fuelling; will explore that next.
Post #1053693 2nd Dec 2024 10:22pm
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