temp gauge

[jock sproket]

looking for any tips coming back north from chatsworth in the 350i temp gauge started misbehaving as with the fuel gauge temp would rise fuel would fall then settle back down again car is not overheating and have changed thermostat when running gauge sitting about 85/87 then every now and then gauges start to wander.any ideas out there

jock

[redweapon]

Air lock ?

[jock sproket]

thought that checked and made sure just can't see why fuel and temp gauge are both erratic

jock

[gingerclive]

If more than one guage is affected it often points to a bad common earth.

[GV]

gingerclive said:

If more than one guage is affected it often points to a bad common earth.

Agreed....check your Earth connections. I did away with the factory earth connection and went straight to the Neg side of the battery.

[jock sproket]

Thanks will check this week if her indoors lets me we are supposed to be decorating

jock

[Jonny weggie]

Just tell her indoors she'll need to wait as the car comes first. Then run like fk.
cheers

[_Absinthe_]

Jonny weggie said:

Just tell her indoors she'll need to wait as the car comes first. Then run like fk.
cheers

hahaha!!! a man who likes livin on the edge I see!!!

[jock sproket]

johnny you know her would you argue you know what the team are like when they get together the ain't got a look in

jock

[honestjohntoo]

It may not be the same on your marque, but on some mid '80's BL cars the fuel (34) and temperature (46) gauges are powered via a crude Lucas Voltage Stabilizer device (64) as seen on this diagram.



The stabilizer is needed to prevent both gauges drifting about, affected by variable battery voltage during driving, idling, charging, cranking, etc.

When the VS goes croaky, both gauges play up - or die. The oil pressure gauge (449) is powered by battery volage perhaps to protect driver sanity were the gauge to suddenly read zero.

[grahamw48]

Cortinas had them too...cost over a quid in 1980, so off to the scrapyard.

[jock sproket]

thanks guys could be the answer will look into it

jock