TVR S1 Oil Pressure Gauge
Discussion
I did have a search through old posts and utilised the info I found but I'm not sure if my current assumptions are correct.
I have never seen this oil pressure gauge working, nor have I tried to debug an electrical gauge before as all my MGs have had mechanical gauges, so I'm after advice!
Symptom: No oil pressure indicated on the gauge with engine running. Oil seeping from sender when engine running (indicating some pressure?).
Testing done
1. Removed gauge, earthed 'S' (sender) terminal and applied 12v to the '+' (ignition) terminal. Gauge shoots to 100psi.
2. Connected 'S' to 12v and '-' to earth on battery, then applied 12v to '+' - needle flickers from zero to 20psi.
My assumption here is gauge is working.
3. Replaced the sender with a two pin aftermarket same range for psi - 03- 180 ohms resistance (?). No oil pressure indicated. Earthed 'S' - no change.
Assumed also a problem with wiring (possible dodgy connector from engine loom to dash loom).
4. Ran a bypass from sender 'G' (Gauge) to the gauge. No oil pressure indicated.
5. Earthed the 'S' on the sender. Needle shoots to 100psi, drops to 80 psi on starting (so something is happening).
I suspect that I had a dodgy original sender and a wiring fault. I am guessing I now have a wiring fault and the wrong oil sender resistance.
Does anyone know the correct resistance for the sender in an S1 and is mine exhibiting the symptoms that you would expect for the wrong sender resistance?
I have never seen this oil pressure gauge working, nor have I tried to debug an electrical gauge before as all my MGs have had mechanical gauges, so I'm after advice!
Symptom: No oil pressure indicated on the gauge with engine running. Oil seeping from sender when engine running (indicating some pressure?).
Testing done
1. Removed gauge, earthed 'S' (sender) terminal and applied 12v to the '+' (ignition) terminal. Gauge shoots to 100psi.
2. Connected 'S' to 12v and '-' to earth on battery, then applied 12v to '+' - needle flickers from zero to 20psi.
My assumption here is gauge is working.
3. Replaced the sender with a two pin aftermarket same range for psi - 03- 180 ohms resistance (?). No oil pressure indicated. Earthed 'S' - no change.
Assumed also a problem with wiring (possible dodgy connector from engine loom to dash loom).
4. Ran a bypass from sender 'G' (Gauge) to the gauge. No oil pressure indicated.
5. Earthed the 'S' on the sender. Needle shoots to 100psi, drops to 80 psi on starting (so something is happening).
I suspect that I had a dodgy original sender and a wiring fault. I am guessing I now have a wiring fault and the wrong oil sender resistance.
Does anyone know the correct resistance for the sender in an S1 and is mine exhibiting the symptoms that you would expect for the wrong sender resistance?
Thanks fellas - I can see that my resistance range is wrong on the new sender.
88S1 is lending me some bits from a sister car this weekend so I can eliminate various elements, but the wire from sender to gauge is definitely not playing ball so I guess there's a multi plug pin gone astray when I replaced the dashboard.
The original sender I can see is leaking near the small brass connector, bubbling up through what looks like a soldered joint and also from the rear seam, all of which is only visible after peeling off the outer black plastic.
Nearly there though, so hope to be taking it for an MOT in the next couple of weeks, work permitting.
88S1 is lending me some bits from a sister car this weekend so I can eliminate various elements, but the wire from sender to gauge is definitely not playing ball so I guess there's a multi plug pin gone astray when I replaced the dashboard.
The original sender I can see is leaking near the small brass connector, bubbling up through what looks like a soldered joint and also from the rear seam, all of which is only visible after peeling off the outer black plastic.
Nearly there though, so hope to be taking it for an MOT in the next couple of weeks, work permitting.
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