3.9 V8 warm up time

Markdisco94 · Dec 14, 2014

How long should it take for a Disco 3.9 V8 to get up to operating temperature? And where would this be on the gauge?

I can drive for 20 minutes and it won't be at the 1/4 mark on the temp gauge.

It only really gets near the middle on a motorway run.

I'm wondering if my stat is stuck open?

My previous experience of the RV8 you couldn't keep it cool enough!

Silverbeard50 · Dec 14, 2014

Mine is pushing warm air out of the heater within a few minutes and showing fully warm (middle of the gauge) within ten.

discool · Dec 14, 2014

That's it 1/4-1/3mark just on the bottom of the temp symbol, takes 5 mins at idle to do that this morning with frost everywhere or 1 mile down the road and stops there even on a hot day at + 25dec C, always been the same from day one, even with a/c on that's when the engine bay does get hot.

Silverbeard50 · Dec 14, 2014

It's within the 'normal' range on the gauge in the picture. It could be that there is a slightly cooler stat fitted than standard but I wouldn't be worried if mine consistently ran like that. Worth changing the stat if the fuel consumption is not where you think it should be.

cooltide · Dec 14, 2014

Change the stat. You need an 88 degree one for a 3.9 hotwire. Only a few quid and a bit of instant gasket

pete1987RRC · Dec 14, 2014

Is it blowing hot?
The sender unit could need replacing and check the thermostat of course

Markdisco94 · Dec 14, 2014

I have a different gauge to that. I'll take a pic after a bit of driving later. It is graduated like the fuel gauge but rotated 90 degress.

It's the fuel consumption that seem a bit low, even for this.

Am I right in thinking the ECU ignores the lambda sensors until the engine is at 70 degrees? If so, and my stat is wrong or stuck open, that could possibly explain it.

cooltide · Dec 14, 2014

Markdisco94 said:
I have a different gauge to that. I'll take a pic after a bit of driving later. It is graduated like the fuel gauge but rotated 90 degress.

It's the fuel consumption that seem a bit low, even for this.

Am I right in thinking the ECU ignores the lambda sensors until the engine is at 70 degrees? If so, and my stat is wrong or stuck open, that could possibly explain it.

Your temp gauge signal is not read by the ECU. The efi loom has a separate water temp sensor.

cooltide · Dec 14, 2014

You can check when the thermostat opens by feeling the top rad hose. It will stay cold till it opens

Markdisco94 · Dec 14, 2014

Is this temperature sender for the gauge:

Discovery 1 Thermostat & Temperature Sender at www.rimmerbros.co.uk

I'd completely forgotten about feeling rad hoses. I'll try that as soon as I get chance.

cooltide · Dec 14, 2014

Stat yes, sender looks right (single male spade): but tbh never needed to unscrew one. Your local Indy should be able to get these next day. Same goes for auto parts on the thermostat

discool · Dec 14, 2014

Yes it is, PRC 8783 for an auto or PRC 8003 for a manual.

Markdisco94 · Dec 15, 2014

Piccy time,

Here is what I see after 5 minutes idling and around 15 mins of driving:

(I really need to clean the interior!)

cooltide · Dec 15, 2014

That's about right if you started with a full tank

Markdisco94 · Dec 15, 2014

cooltide said:
that's about right if you started with a full tank

You're not wrong

3.9 V8 warm up time

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