Water temp erratic.

[barnesus]

Morning,

My water temp is very erratic. Suddenly started jumping to dizzy numbers 150 - 120 Oc then back where it should be, oil temp also doing it a little? This is very odd? Any thoughts?

Will the fans still kick in properly, are these triggered by the same sensor?

Thank you.

[nawarne]

Most likely to be the sensors.

Oil temp sensor on rear of dry sump tank about 30mm up from bottom.

2 coolant temp sensors....One for ECU below No.5 throttle body, and one for gauge/display located below No.2 throttle body.

Suspect that its the latter that's causing your readings. Take it you have checked good oil and coolant levels?

Nick

[barnesus]

Thanks for the reply.

Do you know if the fans rely upon those sensors?

Thanks.

[barnesus]

Thanks for the reply.

Do you know if the fans rely upon those sensors?

Thanks.

[NCE 61]

The cooling fans switch on and off using the ECU sensor first at 92 Deg.C the second at 96 Deg.C. There can be a difference between the two sensor readings usually the dash sensor reads higher than the more accurate ECU sensor.

[Dischordant]

They aren't triggered by the dash displayed sensor - hook up to a laptop/phone to check what temperature the ecu thinks it is - if so probably just need the other sensor replacing.

[Firing order]

Hi baranesus did you manage to sort out the temperature fluctuation ?
My Tuscans doing the same thing last time I drove it stopped straight away seems the fans are cutting in and engine wise all ok .

[mattus]

Hi , sorry to butt in; i had the same symptons, upto 199c water, 0 psi oil and erratic oil temp. Car ran fine. Suspected a dodgy earth, and Jason at Str8six confirmed. Tightened the earth point in the passenger footwell / thru engine bulkhead and all is now back to normal .
Hope it helps .

[SergSC]

mattus said:

Hi , sorry to butt in; i had the same symptons, upto 199c water, 0 psi oil and erratic oil temp. Car ran fine. Suspected a dodgy earth, and Jason at Str8six confirmed. Tightened the earth point in the passenger footwell / thru engine bulkhead and all is now back to normal .
Hope it helps .

Yep this.

[stuthemong]

Whet exactly is this earth? Do I lift pax carpet and its obvious or what?

[nawarne]

^^^Yes, lift passenger footwell carpet, substantial, black (earth) wire to bolt.

Don't discount a failing dash sensor (the one located below 1 - 2 throttle bodies). I had this fail on my Tuscan....took 4 changes of the sensor to get one that worked. Would appear that a bad batch entered the supply chain.

Nick