1983 Ferrari 308 QV Speedometer Sensor

I'm new to my QV, and I'm already experiencing the intermittent speedometer failure I've read quite a bit about...I do believe it is the sending unit on the transmission, as when the speedometer drops back to zero the odometer also stops, all springing back to life shortly thereafter. I'd like to fix this before I get more miles on it, and I actually bought a sending unit, which the eBay seller stated "tested and working" for whatever that's worth. But, comparing side by side to my original, they are different. Same part number, different wiring. The one out of my car (covered in oil when I removed it) is the one on the left with the pigtail on it, the one on the right is the possible replacement, with two separate connectors. So:

1. Is the one on the right even usable for my car if I could adapt the wires? I do not want to cut anything, so I'd have to make an adapter of some kind to join the original connector to this. Would rather not go through that, perhaps I could trade this one for the correct one.

2. Is anyone rebuilding the QV ones yet, perhaps I could just send my original out and have it gone through. It does seem like it continues to weep oil out of the bottom of it, so I'm guessing the guts of it are contaminated as I have seen mentioned in other posts.

Thanks for the advice. I'm enjoying my car very much!
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My speedo is getting a little flaky too. When it gets bad enough, I am probably just going to buy a new sensor from Ricambi America though and just be done with it.

Regarding your used sensor with the different connector, if you want to put in the effort, I am sure making an adapter pigtail would be straightforward. I wouldn't cut the wiring harness on the car itself though.

 

Well, the used one I bought continues to be a bit of a mystery. Rather than make a new wire connection, I ended up buying a brand new one with the correct pigtail from Ricambi for a lot less than I thought it would cost, so that will be reinstalled in a few days...problem solved.

 

I believe you can buy a new one like yours here. Electrical Parts for Ferrari 308, 208, 288 GTO & F40 - Superformance

 

Just saw your post Brian_A...I would absolutely just buy the new one from Ricambi. I didn't realize that most of the posts I had searched on this subject were that old- the price on the new sender was maybe $260, and readily available! Live and learn. It takes longer to jack the car up and get under it than to actually change the sensor, total no brainer. I worried that splicing wires would just be one more potential failure point down the road, so I'm going to just avoid that!

 

Thanks offtheworkigo- I will keep them in mind down the road, too.

 

Received my package from superproformance Friday. Took 4 days from the time I order all my goodies to get here. My odometer and speedometer both would stop working after 15 to 20 minutes after driving. After reading many of the threads on here I decided to purchase a new sending unit. An actual Ferrari part. I thought it was cheap compared to other places I checked. Put it in today drove around for over a hour with no problems. I think its fixed!!! Thanks to all for your research and advice.

 

Installed, and all is well again on mine, too! Nice to see the speedo working reliably, although against my Garmin says it reads 7 mph fast, just like it did before...

 

If I change the sensor will I lose my gearbox oil or is it dry?

 

The sensor screws in from the top of the case pointing downward, so just don't do it while the engine is running, and you're fine

 

The early models are on top and the later ones are on the bottom.
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Remind me to stop chiming in on QV issues

 

I did wonder, mines at the bottom, will the oil drain if I remove it?

 

You might try this first: http://www.ferrarichat.com/forum/308-328-sponsored-yellow-compass-group/529168-cheap-repair-speed-sensor-type-2-vegilia-68-0517-a.html befire you spend any money.

 

So is the same sensor as my QV?

 

Yep.

 

Are there different sensors for mph and Kms? Got one from superformance and speedo does not work at all, mine is a kms car.

 

I don't think so -- I believe all versions (that use the "electronic" sensor) use the same 116987 sensor. Is your odometer also not working?

 

With original sensor, the speedo and odometer work to start then the speedo dies with the odometer, then the speedo comes alive again but no odometer. Same thing every day. Forgot to mention this is on an 85 Mondial QV with separate speedo and odometer, I have posted in that section to but I seem to have more joy here as to the sensor

 

I'll have a look at the MondialQV wiring diagram tonight, but, even though the speedometer and odometer are in different locations, I believe that they use the same signal from 116987 -- i.e., would be very unlikely that one could work while the other didn't if the 116987 sensor was bad (and since you report that that does happen = might be something else).

 

Yes, one side of the 116987 sensor (RN wire) goes to both the speedometer and the odometer, but the other V wire (which I think is a constant +12V source) comes only from the odometer assembly (and unfortunately, the interior details of the odometer assembly are not shown). See if you can get the Euro MondialQV wiring diagram here:

https://www.dropbox.com/s/shgl3mh5nmmfqcw/Wiring%20Diagram%20Mondial%20QV%20Euro%20Version.pdf?dl=0

And this thread post #7:

http://www.ferrarichat.com/forum/technical-q/193519-new-speedo-sending-still-dead.html

has instructions for how to do some functional electrical tests at the 116987 connector if you have to go there

Good Hunting!

 

So something must be in the air. My 308 QV is experiencing the intermittent speedo/tach issues.

What is the procedure for replacing the sensor?

1. Remove sensor
2. Replace sensor (Anything (tape) on threads?)
3. Does the gearbox oil drain out in the Q.V. when replacing the sensor as it appears to be on the bottom?
4. Good time to replace the gearbox oil?

Sorry for all the questions but thought once we can get this laid out I could take pics and post with the instructions.

I have a sensor on order.

Thanks.
Shashi