Sensor identification

[mangocrazy]

I've been digging through (and cleaning up) some of the engine sensors on my Spider 2000, but am unsure as to their purpose and where they go. I've got 4 sensors that I'd like to identify, shown in the photo below along with any markings i can read on the body of the sensors. I'm pretty sure that sensors 3 and 4 screw into the head (without a washer, they are a tapered thread), but am not sure what each one does. I'm completely in the dark about sensors 1 and 2. What are they and what do they do? Could they have come off the i.e. motor/top water rail I 'converted' to carbs?

[rossocorsa]

1 and 2 look like they are from an injected car, beyond that I'm not 100% sure without looking into it more

https://www.amazon.co.uk/photos/share/cW9BpwKTCMvE0zOzQqv65zc5CjEcpDNFNwmgCQnU5Ge

Items 7&8 I think could be relevant. The other two go
on the head overheating warning light switch or temperature gauge sensor maybe?

[peteracs]

Hi

Item 1 is a cold start thermal switch

https://www.autodoc.co.uk/bosch/668255

Item 2 is a coolant temp sensor

https://www.autodoc.co.uk/bosch/7005118?gshp=1&gclid=CjwKCAjwsO_4BRBBEiwAyagRTZYM-NosyGihZ69xZ62xjZjrEcnp9l7bnFDMM52rttcC6CZPOWUT9RoCEtoQAvD_BwE

Item 3 is also coolant temp according to

https://www.ebay.ie/itm/Sensor-coolant-temperature-for-FIAT-ABARTH-LANCIA-SEAT-LADA-ALFA-ROMEO-/173680243449

Item 4 is coolant alarm sensor

https://www.ebay.com/itm/Fiat-Alfa-Romeo-Lancia-NOS-COOLANT-TEMP-WARNING-LIGHT-SENSOR-Spider-Montecarlo-/401169124286

As to where they go, no idea at this time, hopefully someone will be along....


Peter

[mangocrazy]

Nice work! Some good sleuthing there... I followed an entry on ebay.it for an MF425 and it appears it's also used in a Fiat Tipo 2.0 i.e. Do a search on ebay.co.uk and the part is avalable for £7.22:

https://www.ebay.co.uk/i/362752948714

And the MF303 water temperature warning sensor equivalent is used on a host of Fiat, Lancia and Seat cars. This is an example:

https://www.ebay.co.uk/itm/Fiat-Lancia-Seat-COOLANT-WARNING-LAMP-TEMPERATURE-SWITCH-OEM-Fae-4334613-35070/283786087621

So it seems like we have readily available alternatives for both parts.

[peteracs]

Yes, but do you know where they fit.....?

[rossocorsa]

Nice work! Some good sleuthing there... I followed an entry on ebay.it for an MF425 and it appears it's also used in a Fiat Tipo 2.0 i.e. Do a search on ebay.co.uk and the part is avalable for £7.22:

https://www.ebay.co.uk/i/362752948714

And the MF303 water temperature warning sensor equivalent is used on a host of Fiat, Lancia and Seat cars. This is an example:

https://www.ebay.co.uk/itm/Fiat-Lancia-Seat-COOLANT-WARNING-LAMP-TEMPERATURE-SWITCH-OEM-Fae-4334613-35070/283786087621

So it seems like we have readily available alternatives for both parts.

The best sleuthing is finding versions with the original style shrouding around the connector  they are out there if you look hard enough and are rather more satisfactory

[mangocrazy]

As regards where they fit, I'd say I'm reasonably confident that items 3 and 4 bolt into the cylinder head. I'd need to check the wiring diagram to know which way round, as both parts appear to have an M16 x 1.5 taper thread.

And fully agree regarding the shroud around the terminal. The alternatives do look very exposed. I'll keep digging...

[WestonE]

Hi Graham

1&2 IE Coolant rail telling the ECU when to turn off cold start and when to lean of the main map. Number 3 tells your dashboard water temp gauge to move vaguely in relation to actual water temperature. Number 4 tells you that the engine has melted because it come on at 115 degrees turning the red light on the end of the coolant gauge on. I normally replace this with a modern water temp sender when I am installing Fuel Injection and send the dash light a signal from the ECU at 100 degrees from memory.

I know the OE dash is slow and inaccurate compared to modern sensors and TQ gauges water temp is poor but Oil Pressure and Oil Temperature is very poor. Little more than a comfort blanket as they are so slow and inaccurate.

By all means get a new Water Temp sender but do not expect it to suddenly make the dash a precision instrument.

Eric   

[mangocrazy]

Thanks Eric - that's broadly as I suspected. As I have no use for sensors 1 or 2 I'll probably put them up in the 'for sale' area at nominal cost. The temperature alarm/warning sensor alse has a +/- 3 degree tolerance, so water temp could be 118 degrees when it finally decides to fire. I'll be replacing that with a 100 degree item for sure. I presume any sensor with the correct thread and a single terminal will suffice?

I remember reading an earlier post of yours with reference to the inadequacy of standard oil pressure and temperature sensors and gauges. I'd like to install uprated oil pressure and temp sensors while the engine is still on the stand. Do you know any you could recommend?

[WestonE]

Stack Racetech Autometer maybe VDO

They must have matching senders if electric

For race cars Racetech Capillary are a favorite

My sensors for the ECU are AEM
 
Eric