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PostPosted: Sun Jun 02, 2019 6:19 pm 
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Light Pressure Turbo

Joined: Mon Aug 22, 2016 11:23 am
Posts: 395
Location: Leicestershire
Car Model: 1992 900i, 1984 T16S “Snufkin”
So how come my auxiliary temperature gauge on Snufkin doesn't seem to work anymore? All I did was change the oil and then it didn't seem to work. I checked the wiring and the gauge: all work fine, continuity etc, gauge flicks on start up, so I changed the oil again, cleaned the sender: nope, no joy. Changed the oil again and put a new sender in: still no joy: although I think the setup *is* working, but the needle moves about 1 mm....and stays around 50degC. Tested the old sender in hot water, and I get changing impedance with temperature, so I'm thinking the sender works fine.
Anyone any ideas?
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PostPosted: Sun Jun 02, 2019 6:33 pm 
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Barrelling Along
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Joined: Fri Nov 23, 2007 6:13 pm
Posts: 20372
Location: Maidstone
Car Model: 9-5 Aero
Have you been for a drive?
Is the oil actually getting hot enough?
Take the sender out and test in boiling water whilst still wired up?

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Rich
Prefers driving over polishing or reading.


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PostPosted: Sun Jun 02, 2019 6:43 pm 
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Light Pressure Turbo

Joined: Mon Aug 22, 2016 11:23 am
Posts: 395
Location: Leicestershire
Car Model: 1992 900i, 1984 T16S “Snufkin”
Done all three. Driving until the fan comes on. No change in needle position. Not tested the new sender in hot water, as that would require another oil change- maybe after the MOT on Tuesday I’ll have another look...


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PostPosted: Sun Jun 02, 2019 9:20 pm 
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Barrelling Along
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Joined: Fri Nov 23, 2007 6:13 pm
Posts: 20372
Location: Maidstone
Car Model: 9-5 Aero
You do know that oil temp is independent coolant temp and lags way behind........ a good run needed I do believe.

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Rich
Prefers driving over polishing or reading.


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PostPosted: Mon Jun 03, 2019 9:48 am 
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Light Pressure Turbo

Joined: Mon Aug 22, 2016 11:23 am
Posts: 395
Location: Leicestershire
Car Model: 1992 900i, 1984 T16S “Snufkin”
Just spent an hour or so faffing - results so far - took the wire off the sender in the sump and put the original sender in boiling water. Managed to get impedance changes and *just* managed once to get the gauge to register more than 50 degC. So decided I needed more heat - enter the heat gun, carefully perched on the intercooler, pointing at the original sender (connected to the wire), grounded to the throttle body. Managed to get the gauge to read c100degC, so..... I think everything should work fine :roll: . Maybe if the weather is nice this week I'll have a good thrash around Leicestershire....


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PostPosted: Mon Jun 03, 2019 10:24 am 
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Barrelling Along
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Joined: Fri Nov 23, 2007 6:13 pm
Posts: 20372
Location: Maidstone
Car Model: 9-5 Aero
How long was the sender in the boiling water?
I would have thought more than a few seconds and it would register a reasonable temp....... are the resistance changes from the sensor still within range? You should be able to access the specification online.

However, yes a thrash sounds like a plan :twisted:

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Rich
Prefers driving over polishing or reading.


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PostPosted: Mon Jun 03, 2019 10:42 am 
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Light Pressure Turbo

Joined: Mon Aug 22, 2016 11:23 am
Posts: 395
Location: Leicestershire
Car Model: 1992 900i, 1984 T16S “Snufkin”
It was in the water for a few minutes - I took the kettle out so I could have *piping* hot water. Impedance looks to be in spec:
Attachment:
IMG_6296.PNG
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Thrash report to follow at some time 8)


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PostPosted: Tue Jun 04, 2019 11:43 am 
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Light Pressure Turbo

Joined: Mon Aug 22, 2016 11:23 am
Posts: 395
Location: Leicestershire
Car Model: 1992 900i, 1984 T16S “Snufkin”
Thrash report, along with MOT pass with no advisories this morning 8)
Managed to get the needle to move, so I think it needs summer scorchio weather to make a difference.
Next up, squeaky steering column and dash lights that have a mind of their own...
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