Fiat Coupe Forum Fiat Coupe Forum
- Founded by Kayjey & James Northam - Funded by the Club for the benefit of all owners -
mixed RSS feedall RSS feeds
(this will scroll you to the RSS box)
Fiat Coupe Club UK
join the club
Fiat Coupe Forum
» Announced
    Old Forum BACK!
    Forum RSS feed!
    Images - finally!

» Related sites

» External data
Who's Online
4 registered (Serg1, Jan, jonnyboy54321, 1 invisible), 68 Guests and 0 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
2,664 Registered Members
67 Forums
109,187 Topics
1,298,386 Posts

Most users ever online: 546 @ 30/08/2007 19:16
Top Posters
stan 32079
barnacle 31877
Theresa 22767
bockers 21001
pinin_prestatyn 19886
PeteP 18698
JimO 17908
Nigel 16932
Jim_Clennell 16245
Vickster 15915
RSS Feeds
Club Events
Club Information
Track Events
Rolling Road/RWYB
Social Events
Non-UK Events
Coupé Related Chat
Coupé Spotting
Coupé News/Press
Buying/Selling Advice
Insuring a Coupé
Basic FAQ's
How to Guides
Forum Issues
Technical Problems
General Maintenance
ICE and Alarm
Coupés for Sale
Coupés Wanted
Parts for Sale
Parts Wanted
Group Buys
Business Forum
Other Vehicles for Sale/Wanted
Other Items for Sale/Wanted
Ebay links
Other Cars
Other Websites
General Chat
Topic Options
#1625893 - 10/10/2018 13:12 The matter with Water-Oil temp gauges low reading
kkprince Offline

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..



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

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

Registered: 25/05/2012
Posts: 1882
Loc: Going North on the A9

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


Good effort for 1 euro..

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

Registered: 01/10/2018
Posts: 3
Loc: Bergamo
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.

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