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benbumpkin

Member Since: 07 Jun 2022
Location: Cork
Posts: 3

2007 Defender 110 Puma 2.4 SW Barolo Black

2.4 Cylinder Head Temp Limp Mode

I have diagnosed my 2007 defender's problem of limp mode down to the Cylinder Head Temp reaching approx 117 degrees C. I can reproduce by going up a hill.
To summarise previous topics regarding loss of power (please correct me if I am wrong):

1. 2.4 Only has a Cylinder Head Temp (CHT) sensor. It does not have an Engine Coolant Temp sensor.

2. Power loss initiated by this reaching 120 degrees does not generate a fault code. WTF

The dashboard temp is never above 1/2 range (Otherwise I would have pulled over).
Does is have a dedicated sender unit not wired into the EMS?

I noticed a few other unusual values from my obd2 reader (a cheap one) and may have other issues.
Intake Air Temp 110 degrees with engine off.
Airflow Rate from MAF was 2.88g/s with engine off.

I have read some scary stories here about engine temp disasters.

Not sure what my next move is.
Cooling System work?
Change sensor/sensors?

Thanks in advance
Ben

8th Jun 2022 12:11am

spudfan

Member Since: 10 Sep 2007
Location: Co Donegal
Posts: 4661

The engine is designed to shut down if it gets to a certain temperature to avoid engine damage. I would check for leaks in the cooling system. You might get a smell when driving and this would be the coolant hitting a hot surface and evaporating. I would start the engine at look at the water pump as this can leak. It could be a circlip or hoseclip that was not tightened enough allowing a hose to slip down off a pipe allowing coolant to escape. That is the simple stuff to check. Both the circlip thing and leaking water pump happened to me. Goog luck. 1982 88" 2.25 diesel
1992 110 200tdi csw -Zikali
2008 110 2.4 tdci csw-Zulu
2011 110 2.4 tdci csw-Masai

8th Jun 2022 3:20pm

hank

Member Since: 12 Sep 2016
Location: South Wales
Posts: 2300

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

You are correct there is no coolant temp.

There is cylinder head temp, oil level and temp, fuel rail temp. (As well as manifold temp via MAF)

I suspect the dash temp might be taking its reading from oil? Might be worth getting yourself a live readout device so you can keep an eye on temps in real time. Could be a dodgy CHT sensor or something more sinister. Good luck with it > 110 XS Double Cab

8th Jun 2022 4:08pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17382

There is no oil level sensor on a 2.4.

8th Jun 2022 4:27pm

shropshiredefender

Member Since: 05 Jun 2017
Location: Shropshire
Posts: 834

2011 Defender 110 Puma 2.4 USW Santorini Black

Re: 2.4 Cylinder Head Temp Limp Mode

benbumpkin wrote:
I have diagnosed my 2007 defender's problem of limp mode down to the Cylinder Head Temp reaching approx 117 degrees C. I can reproduce by going up a hill.
To summarise previous topics regarding loss of power (please correct me if I am wrong):

1. 2.4 Only has a Cylinder Head Temp (CHT) sensor. It does not have an Engine Coolant Temp sensor.

2. Power loss initiated by this reaching 120 degrees does not generate a fault code. WTF

Ben

Had this problem a few years ago during a 330 mile drive from Scotland.
Hill climbing would cause limp mode. Slow roads and heavy traffic resulted in the same.
Cruising on the motorway at 70 ish - no problem.
No DTC.

Luckily my indi had seen this once before, and, instead of looking for dirty fuel (my diagnosis), he checked the cooling system and found a small leak in the radiator.
He explained about the CHT as you and others have outlined.
Simple things first, check coolant level, then look for leaks.
Good luck

Just because you're offended doesn't mean you're right.

8th Jun 2022 5:08pm

hank

Member Since: 12 Sep 2016
Location: South Wales
Posts: 2300

blackwolf wrote:
There is no oil level sensor on a 2.4.

According to the wiring diagrams there is an oil level sensor signalling the ECU?
I agree there is no oil level warning light

Click image to enlarge > 110 XS Double Cab

8th Jun 2022 5:19pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17382

There's a connector on the harness for it, there is a sensor in the sump for it, and there is an input on the ECM for it, but it is not connected. It is there because there are other applications of the engine and ECM in the Ford line-up which did use it.

From the WSM:

"The oil level and temperature sensor is installed in the cylinder block skirt stiffener, mid-way along the RH (right-hand) side of the engine. The oil level signal is not used, as a mechanical dip stick is fitted. The ECM uses the oil temperature signal to control the engine oil temperature. In extreme operation the ECM limits engine torque to prevent the oil temperature exceeding 140 °C (284 °F)."

I don't know if anyone has connected it to see what happens. I suspect that all it would do is add another set of possible faults.

8th Jun 2022 7:11pm

Greyman110

Member Since: 29 Sep 2017
Location: London
Posts: 327

I had the same issue.

https://www.defender2.net/forum/topic75278.html

Turns out for me it was the head gasket.

I did change pretty much everything that it could have been before finally doing the HG.

8th Jun 2022 9:32pm

hank

Member Since: 12 Sep 2016
Location: South Wales
Posts: 2300

blackwolf wrote:
There's a connector on the harness for it, there is a sensor in the sump for it, and there is an input on the ECM for it, but it is not connected. It is there because there are other applications of the engine and ECM in the Ford line-up which did use it.

From the WSM:

"The oil level and temperature sensor is installed in the cylinder block skirt stiffener, mid-way along the RH (right-hand) side of the engine. The oil level signal is not used, as a mechanical dip stick is fitted. The ECM uses the oil temperature signal to control the engine oil temperature. In extreme operation the ECM limits engine torque to prevent the oil temperature exceeding 140 °C (284 °F)."

I don't know if anyone has connected it to see what happens. I suspect that all it would do is add another set of possible faults.

Very useful to know thanks

> 110 XS Double Cab

9th Jun 2022 8:03am

benbumpkin

Member Since: 07 Jun 2022
Location: Cork
Posts: 3

Greyman110 wrote:
I had the same issue.

https://www.defender2.net/forum/topic75278.html

Turns out for me it was the head gasket.

I did change pretty much everything that it could have been before finally doing the HG.

Geez, I hope not! Thats serious money.

9th Jun 2022 10:40pm

benbumpkin

Member Since: 07 Jun 2022
Location: Cork
Posts: 3

Hi everyone, thanks for your help.

It was dodgy water pump, a cooling system issue, which seemed to be the consensus.

I am a bit peeved that my dash indicator didn’t indicate any problem.

Time to invest in an engine coolant gauge I think.

7th Oct 2022 5:30pm

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