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Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 2034

It could possibly be the cylinder head temperature sensor, on the 2.4 it is that sensor that is used to show coolant temperature, so if it’s faulty it could give a wrong reading and put you in limp mode.

When you go into limp mode does the amber check engine light illuminate on the dash, are any diagnostic trouble codes showing on a code reader.

If no codes or Check engine light then could be VCV. The absence of any codes indicates the vcv.

Lastly, but I expect less likely- Have you been loosing any coolant ? has the coolant system over pressurised? If so it points to a head gasket issue.

9th Oct 2023 9:50pm

The Anti Christ

Member Since: 24 Feb 2022
Location: Kingston
Posts: 26

2009 Defender 110 Puma 2.4 SW Santorini Black

Thanks Ianh,

No check engine light or any other indication of something going wrong apart from the momentary loss of power and sudden needle spike and return.

Otherwise, drives like new all day long.

No coolant issues either.... Just fix it before your friends find out it broke again - Landy Life Forever!

9th Oct 2023 11:05pm

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 2034

Then that would indicate a VCV issue, very common on 2.4s with lots different symptoms.

The only thing that confuses me is the temp gauge flicking to high then dropping to cold.

Ps make sure it’s a proper Denso replacement from a reputable supplier if you choose to change it. Lots of topics on here re 2.4 VCV.

9th Oct 2023 11:13pm

mwestcrew

Member Since: 09 Dec 2019
Location: South Warwickshire
Posts: 265

2011 Defender 130 Puma 2.4 HCPU Baltic Blue

The loss of power and temp gauge shooting up momentarily has been discussed here before.
If I recall correctly it was head temp sensor issue. Not connected with cooling system as such.

Have a search. 2011 130 Utility Body
2005 110 Van

10th Oct 2023 8:02am

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 2034

The cylinder head temperature sensor was my initial thought as well, and for circa £30 -£40 is the lowest cost easiest thing to replace.

10th Oct 2023 11:42am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17450

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

The Anti Christ wrote:
Thanks Ianh,

No check engine light or any other indication of something going wrong apart from the momentary loss of power and sudden needle spike and return.

Otherwise, drives like new all day long.

No coolant issues either....

This sounds to me like a momentary loss of power to the main relay under the seat or the ECM, so in effect the ECM is shutting down the engine which then restarts (because you are still moving) as the power returns. It won't generate a fault code since in effect it thinks you've switched off and on.

Check electrical continuity to the relays (in particular the firmness of the individual spade connectors) as well as ECM earths.

10th Oct 2023 11:44am

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