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bear100

Member Since: 22 Mar 2010
Location: South Wales
Posts: 1871

2010 Defender 110 Puma 2.4 USW Santorini Black

When cold put the ignition on does the temp needle move at all?
Also do you have anything plugged into the OBD ie UltraGauge? 2016 Range Rover Autobiography 4.4 TDV8
2010 110 XS Utility 2.4TDCI
2010 Range Rover Sport TDV8 (gone)
2007 Discovery HSE TDV6 (gone)
1993 110 csw 200 tdi (gone)
1994 90 HT 300 tdi (gone)
1994 discovery 300tdi (gone)
90 hybrid 3.5 v8 (gone)
Range rover bobtail 3.5 v8 (gone)

5th Oct 2022 10:24pm

Yesjus

Member Since: 19 Sep 2022
Location: Surrey
Posts: 78

2008 Defender 110 Puma 2.4 XS CSW Santorini Black

Greyman110 wrote:
I only mentioned the head gasket as my car was up and down for a while. It became predictable when it was going to go into limp mode but it took a while before that happened. It was always going up hill in 6th gear that would trigger it. If i didnt change down before it got into the red then it would become unresponsive to throttle for about 10 - 15 seconds.

It might not be the same for you but if you know the signs then you can look out for it. When it started it happened out of the blue and it was only once in a while.

I had another temp gauge issue on start up but I fixed that by cleaning the Cylinder Head Temp (CHT) contacts with contact cleaner. Cheap fix but a pain to diagnose.

If you have a scanner that can give you a live temp reading then that might be useful to see. Under normal conditions mine doesnt go over 94c with it usually being in the 89c-92c range.

This was my fear it could be head gasket but I must say at this point nothing is jumping out in terms of classic symptoms like coolant loss, block tested, hot and cold temp from blowers etc. so hoping it’s something else at this point but will keep and eye out. At the moment power loss and over heat has happened randomly, no two driving situations the same when it happened if that makes sense.

I have a cheap OBD reader that gives live readings so will hook that up and take some readings. Is it the ECT temp or IAC temp I should be keeping and eye on??

8th Oct 2022 5:36pm

Yesjus

Member Since: 19 Sep 2022
Location: Surrey
Posts: 78

I’ll check the temperature gauge tomorrow morning and see if it moves at all…should or shouldn’t it move? If so what does this indicate?

I’ve been out in it again this afternoon (about 120min round trip) and no issues again!!

So with the mechanic having it for a couple weeks with a few road tests and the couple I’ve done since having her back, including a longer run today, it hasn’t done it once!? So confused what this means?

The other question i was going to ask is that I changed the VCV before the mechanic got hold of it as things pointed to that. I did one short road test after fitted, were it done the power loss/temp rise. So assumed it didn’t work and that’s when it got booked in… now I’m thinking (hoping!!) it may be common for this to happen on the first run while it is “relearning” as i didn’t have the tools to calibrate the new VCV. That’s why it hasn’t done it since and it’s all fixed now 🤞🏻😳😂

8th Oct 2022 5:58pm

bear100

Member Since: 22 Mar 2010
Location: South Wales
Posts: 1871

My CHT sensor gave me very similar faults to you, issues there one day and the next then gone for a few days even weeks. The indicator was the temp needle would rise slightly when cold, I think the CHT sensor was messing with the ecu 2016 Range Rover Autobiography 4.4 TDV8
2010 110 XS Utility 2.4TDCI
2010 Range Rover Sport TDV8 (gone)
2007 Discovery HSE TDV6 (gone)
1993 110 csw 200 tdi (gone)
1994 90 HT 300 tdi (gone)
1994 discovery 300tdi (gone)
90 hybrid 3.5 v8 (gone)
Range rover bobtail 3.5 v8 (gone)

15th Oct 2022 9:24pm

Yesjus

Member Since: 19 Sep 2022
Location: Surrey
Posts: 78

Great thanks. Think I will change this then. Is it an easy sensor to swap out?

15th Oct 2022 10:47pm

bear100

Member Since: 22 Mar 2010
Location: South Wales
Posts: 1871

A little tricky, I had to sacrifice a deep reach socket and cut a slot for the cable.
A cheap and easy part to try

2016 Range Rover Autobiography 4.4 TDV8
2010 110 XS Utility 2.4TDCI
2010 Range Rover Sport TDV8 (gone)
2007 Discovery HSE TDV6 (gone)
1993 110 csw 200 tdi (gone)
1994 90 HT 300 tdi (gone)
1994 discovery 300tdi (gone)
90 hybrid 3.5 v8 (gone)
Range rover bobtail 3.5 v8 (gone)

15th Oct 2022 10:55pm

Yesjus

Member Since: 19 Sep 2022
Location: Surrey
Posts: 78

bear100 wrote:
My CHT sensor gave me very similar faults to you, issues there one day and the next then gone for a few days even weeks. The indicator was the temp needle would rise slightly when cold, I think the CHT sensor was messing with the ecu

Is there a way to test the CHT sensor to see if that is at fault after removal? Also did you get any error codes before changing?

It happened again to me today! This time on the motorway with my family and needed recovery! So i need to know if this is the issue after replacement before trusting her again on a family road trip!! At least with this issue anyway!!

21st Oct 2022 11:32pm

Yesjus

Member Since: 19 Sep 2022
Location: Surrey
Posts: 78

By the way I haven’t changed the CHT sensor yet as it hadn’t done it in a while and I stupidly assumed it may be a one time problem!

21st Oct 2022 11:34pm

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