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Oldowner

Member Since: 26 Dec 2018
Location: South west
Posts: 626

2007 Defender 90 Puma 2.4 HT Aintree Green

Non starting td5 - Cranking rpm?

Friend of mine has a 2004 td5 90, approx 70k miles, Apparently running fine one day, point blank refused to start the next day.
I have been lumbered with trying to help getting it going. Nanocom shows the max cranking RPM to be 280rpm with fully charged battery and a boost pack on the battery - it is spinning over very rapidly but not a hint of life from it - does this sound like a crank sensor fault? I would suggest it is spinning far faster than 280rpm

Fuel pump appears operational, have done a few purges, no trace of oil in ECU, Nanocom states ECU is not immobilised.

18th Mar 2024 10:28am

geobloke

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

If the engine is cranking over fast but the crank position sensor id only reading 280 rpm then that or the wiring is your likely culprit.

I doubt that if the ECU only senses 280 rpm it will inject any diesel for risk of flooding it. When you look for a CPS then buy a decent brand or a good second hand item.

Part number should be NSC100790G but check LR Workshop before you buy.

18th Mar 2024 10:39am

MadTom

Member Since: 10 Sep 2013
Location: Olomouc
Posts: 626

With Nanocom you can check the injectors output od engine ECU - it sounds like big metalic click. Just test all 5 injectors.
Are you sure, you have enough fuel? "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo

18th Mar 2024 3:40pm

Oldowner

Member Since: 26 Dec 2018
Location: South west
Posts: 626

Yes, half tank of fuel, pulled the pump to check and all good. Had a new FPR last year. All injectors fire off correctly on Nanocom. Had a new Hella starter motor a couple of months ago when the original starter broke down internally.
Ordered a genuine Lucas crank position sensor and wiring overlay, will see what happens when fitted.

18th Mar 2024 5:17pm

MadTom

Member Since: 10 Sep 2013
Location: Olomouc
Posts: 626

Did you try starting with full throttle? Or some start spray to air intake? "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo

18th Mar 2024 9:32pm

Green Machine

Member Since: 19 Nov 2010
Location: North Yorkshire
Posts: 1226

Also check the 3 relays under the driver's seat. My 2005 Td5 suddenly wouldn't start (was cranking but not firing) and replacing the relays completely solved the problem. I'm unsure which one it was because I just replaced all 3. One is the main relay and one is the fuel pump relay (can't remember what the third one is from memory). 2005 Td5 | 90 Station Wagon | Tonga Green

21st Mar 2024 11:56am

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