348 No coolant temp / oil pipe leak

Have you checked your multi pin(9 pins/from memory) connection (just in front of left rear shock tower) to verify all is making contact? maybe use a wiring diagram to verify which pin is associated with your coolant gauge and test with a ground wire(just touch for a second). With ignition on, your guage should jump to max. Maybe use a good ground and touch the sender's outside socket head(ignition on/engine hot) and see if guage responds. Maybe your powder coat has coated the threads and not allowing the sender threads to ground? You didn't install the senders with Teflon tape??
Oil leak, did you use new copper washer? I learnt something the other day... if you don't use proper copper washer(that will spread when crushed), but use a standard plumbing washer(copper) it will not crush properly. For those that use a regular copper washer, one must heat washer(red hot), then let it cool, and voila, copper will crush easily!!! Apparently an old wooden boat trick when using copper nails... the nail will act like a rivet(mushroom out), hammer 1 side, anvil on the other....

 

I would have thought so too. There are two sensors with the same part number, so you would assume these were for the ECUs. That only leaves the one facing the rear. The other device/s are switches.

Can you you see the wire colour/s on the sensor facing the rear? The wiring schematics show a grey wire with (it seems) the body of the sensor acting as earth.

The wires going to the ECU sensors are grey and grey with a black stripe. i.e. two wires per sensor. and only talk to the ECUs. According to the diagram, the ECUs do not send water temperature data to the gauge.

https://www.ricambiamerica.com/car-diagrams/ferrari/v6-v8/348-group/348-1989-1992/water-pump.html

Item 47 would be my guess for the gauge.

 

Here's the wiring diagram.

Instrument Wiring Diagram

Look for the contact on the gauge marked "SIG" and follow the grey wire (colour code "H"). Good luck!

 

The third coolant temp sensor is the one that sends temp data to the dash board. Same as a 1995 F355.

 

Here's the pinout of the 9-pin connector (#115) on my 1991 UK spec 348 (the pin numbers can be seen on the connector):

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The one with the brown wire may be for the oil radiator cooling fan. i.e. component 92 on the bottom left of this diagram...

HVAC Wiring Diagram

That should have two wires like the ECU temperature sensors.

 

Item 26 of this diagram is the temp sender for the dash gauge.

https://www.ricambiamerica.com/car-diagrams/ferrari/v6-v8/348-group/348/water-pump.html

What does this mean "pipe section above the AC ?"

 

Just to add a thought on your oil leak.... I believe there is a clamp to steady the pipe up around the compressor. If that's missing, or not attached... well, they'

initial post.."Also, I can’t seam to get rid of a small oil leak on the short oil pipe connections that runs over the AC compressor between the block and the oil cooler. " The Bronze 1.5">2"pipe from the Passenger side block to oil cooler.... runs over top of the AC compressor and has a clamp(to AC bracket) to steady any vibrations
FSM348, glad you found your coolant sender problem. As for the oil pipe, change out the large copper washer with a new OEM one.

 

It depends on where it leaks. Does it leak at the connection to the oil pan, at the transition from pipe to hose, or at the connection to the radiator?

 

True... would probably need to remove, and take it to a hose specialist to re-crimp(if lucky). I believe those hoses are not cheap!

 

I have seen leaks due to a cracked banjo bolts (twice) so that is the reason to dig deeper for the leak. My recommendation is to remove the hose and have it rebuilt (you don't want to know how much it costs new, trust me). Then replace the gaskets as well as the banjo bolts IF there is a crack.

Of course, if the oil is coming from above the hose via the valve cover gasket, then … all bets are off.

 

ah ok... good luck. i agree with 'yelcab', you don't want to know the price of a new one! I see now there are 2 crush washers associated with the banjo bolt.... memory is fading fast!

 

Rebuid it. You live in Indiana, there must be 100 places that do this stuff. It has a huge car culture there.

 

Miro, are the pins on the engine side of the plug or the car side? I've added a small pinout graphic of your diagram to my diagram, but I'm not sure on which side of the plug I should put the graphic. Thanks.

 

I do not remember which view I used (and I think I did not care) since, as Dan also informed, the pins are numbered, on the insides of both halves of the connector, so you just go by that.