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#1625893 - 10/10/2018 13:12 The matter with Water-Oil temp gauges low reading
kkprince Offline
Newbie

Registered: 01/10/2018
Posts: 3
Loc: Bergamo
During the life of my 1.8 April 96 I often encountered
a low reading on water and oil gauges.
(This since 2008 circa)

Typically 70 celsius... and no way to get any higher reading
even in a hot italian August max values was 80.

Because of this the Mecca changed the thermostat twice.

No difference... Mecca told me ...1.8 is a cold motor...
You know..

(?????) (WTFK???)

Then finally in the era of Multiecuscan I discovered that
the sensor for the ECU was reading 90 celsius (perfect value)
despite the fact the temp gauge was still reporting 70.

So I changed the water gauge temp sensor ......

NO WAY... same result...

So I suspect the gauges instruments after 22 got cooked...


For solving the problem .. apart replacing the instrument dash
You need to buy a sensor with a lower ohm temperature curve...
..........Or like I did ........put a 470 ohm
resistor in parallel to the ground and the signal on
the gauge connector (Both for oil and water).

Easy fix..... with an expense of less than 1 euro..
:-)

Cheers

KK



Edited by kkprince (10/10/2018 13:59)

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#1625929 - 11/10/2018 11:14 Re: The matter with Water-Oil temp gauges low reading [Re: kkprince]
dante giacosa Online   content
My life on the forum

Registered: 25/05/2012
Posts: 1874
Loc: Going North on the A9
crikey-

so; you shifted the impedance of the sensors by going across them with resistors..?

okay!

Good effort for 1 euro..

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#1625938 - 11/10/2018 13:36 Re: The matter with Water-Oil temp gauges low reading [Re: dante giacosa]
kkprince Offline
Newbie

Registered: 01/10/2018
Posts: 3
Loc: Bergamo
Yep
Of course not ideal solution as replace the gauges.
But does work.
And is stable.
The min parallel resistance allowed is the one that
IS NOT raising the indicator from his rest position
when the engine is cold.

Sometimes happen the ground of instrument dashboard is NOT
zero ohm if compared to the chassis and this may cause
wrong reading @ high temperature where the sensor goes
very low , below 100 ohm.. but was not my scenario.
KK


Edited by kkprince (11/10/2018 13:46)

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