Dear Ferraristi, I was driving to work today and noticed the speedo bounce between the 20mph and the 50mph markers. I was doing 40. This happened again but stopped after I came to a stop at a traffic light then proceeded onwards. Since the speedo is electronic, where is the pickup located? How do I take the dash pod off? I would like to start with the simple stuff like cleaning the contacts. If no go, change the sensor, if still no go, get the speedo repaired. Would appreciate y'alls input. Shamile Freeze...Miami Vice !
Your VSS sensor is located by the oil filter on the front of the engine - section 32 of TR parts manual - gear box item 32 and to the drivers side of the oil filter. You can locate this, but you need to remove the oil filter to work on it. Then you can trace the wire back to the connector under your dash with a multimeter. The sensor itself takes a 32mm offset wrench to remove. - If you do remove the filter, expect to replace 5 quarts of oil. Steve - 91TR - has a diagram of a special wrench he used for this.
I had this issue two weeks ago on my Boxer. The sending unit was loose. It takes rotary motion input from the gearbox and turns it into an electrical signal. I unscrewed it, unplugged the electrical coupling, cleaned everything with spray parts cleaner, reassembled, tightened, works just fine.
Hey y'all, My speedo is bouncing quite badly. The part 116987, is that the one on the bottom of the gearbox? If I take it out, will gear oil come out. I know, I know, funny question. I don't know if the sender screws into a dry cavity or it is submerged in the gear oil. I have cleaned the connection but my speedo bounces badly. It started off bouncing at 40 mph, but now will start ticking up down at any speed. Is there a way to test the sender with a multimeter so I know it's not the speedo.....or can I imitate a signal to the speedo so I know it's not the sender. Shamile Freeze....Miami Vice !
Yes, IIRC a few quarts of gear oil will drain out the hole when 116987 is removed (as will some engine oil when you remove the oil filter).
Dear Ferraristi, Just wondering, everyone keeps mentioning the removal of the oil filter. My sender ( well, it looks like it ) is on the bottom of the engine towards the front sort of on the left (driver) side. it is no where near the oil filter. In fact, I just did an oil change and when I had the filter off, I looked around for some sort of sender....nothing. The picture of the sender on Ricambi's site looks just like the one on the bottom of the engine...brass nut about 32mm with short cable, long connector. ....am I missing something? Shamile Freeze...Miami Vice !
Can't find a picture, or illustration, that shows it well, but the body of the oil filter is in the space that the lever arm of your wrench has to pass thru to apply the moment (unless you have some sort of very special tool). If you can do it without removing the oil filter, more power to you, but it is a minor beyotch IIRC (like the surrounding casting gets in the way so you can't use a socket).
i had a similar problem with my previous testarossa. the speedo would suddenly peg at the max speed. normally i wouldn't care, but it would also send the odometer turning as if i were really going 200+mph!!! so very short trips turn into 100+ mile trips! i got it fixed right away. required the unit to be rebuilt, iirc. john
Dear Ferraristi, I still don't get it. I don't have any sending unit around the filter area. I do have the brass nut thing on the BOTTOM of the gearbox towards the front of the engine. I will be changing the coolant flush for coolant this weekend. I will take some photos. Shamile Freeze...Miami Vice !
Dear Ferraristi, Ok, Ok....I get it now. I was under the car changing the coolant and verified the nut with the wire on it. I put the car into gear and sped up while on the jack stands. The speedo functioned. I then disconnected the wire, put car into gear and no speedo. The sensor is kinda on the bottom and front side of the engine. I now understand why everyone keeps talking about the oil filter. It's taking it off that's the real head-scratcher. Hmmm, what do you guys do? I see if my short socket has room to fit the wire connector and use a universal joint on the socket to clear the funny angle the sensor is set at; ....still don't really know if that is where the problem lies....will soon find out. Shamile Freeze...Miami Vice !
You're on the right track, it's either the sender, the instrument (speedometer) or the wires in between. The sender is in the hot, vibrating environment and is typically what fails first. Fortunately it's pretty easy to change.
Dear Ferraristi, Well, I pulled the Diablo out, put the TR in the center of the garage, put it up on the jack stands, had my oil catch pans ready..... .....the 32mm short socket doesn't fit ! Actually, the size is correct it's just that the socket is slightly too long that it hits the bottom of the engine casting. I went to Sears last night and picked up a 32mm wrench. Holy smokes ! This sucker is large. I will try it today...doubt it will fit. Unfortunatly, they don't make a crowsfoot wrench that large. ( wrench head with a hole for a wratchet ) Ok, soooo, what do y'all use and why didn't anyone tell me. Ok Ok, joke is on me....now, what's the wrench and where do I buy it? Shamile Freeze....Miami Vice !
We tried to tell you It's classic TR -- looks easy, but isn't. This thread shows how I had a muffler shop bend-up a Sears 1.25" open end wrench to work for me (but probably not the only possible solution): http://ferrarichat.com/forum/showthread.php?t=66295
Dear Ferraristi, Ok, stop snickering ! Now, I get all the cool links served up. 91TR, like the wrench idea. You would think a crowsfoot wrench would be available in 32mm. You would think solving the speedo problem would be the issue, not how to get off the sensor?!? You would think I would be used to this by now. " Hmmm, looks easy enough....but never is. " Shamile Freeze....Miami Vice !
Mine is a 308, but had a similar problem (the morning I backed the car out of the attached garage to put it on the lift in the unattached garage - the speedometer showed 60 mph in reverse at 1000 rpm idle), since you have identified the connection, HAVE you really cleaned the connectors? I used contact cleaner and removed the male and female spade from the nylon pieces put the plugs back together, then tested the speedometer and it worked, then wrapped the connector in black electrical tape. It has been over a year and it is still good. Stephen
Dear Ferraristi, Well, I finially got the speedo sensor off, put the new one in and .......still bouncing. I'm kinda bummed out. I guess that leaves the speedometer. I've already taken the dash-pod apart before so that's not the big deal. The pain in the butt will be sending it out and waiting to get it back. Anyone know a good speedo shop to send it to? Good news. I found a 1 1/4" crowsfoot socket . It fits perfectly on the sensor ( with universal joint ) and got it off and put it back on in a jiff. I didn't have to take off the oil filter or do any contortions like the fastastic 4. I got the socket from one of my idustrial suppliers. The socket is made by wright tool. Part # 1082 It cost me $35.00 and was placed on a standard parts order. A 32mm or 1 1/4" wrench from Sears is $25.00 + bending costs ( solution from 91 TR ) For $10.00 more, you get something that takes the sensor off in 10 seconds. www.wrighttool.com Shamile Freeze...Miami Vice ! Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Shamille, What was the final outcome? Speedo rebuild or what? My speedo started bouncing this weekend between 0 and ~30mph. Past that it works fine. I will look at cleaning connections tonight to see what happens. CC
Dear Ferraristi, Unfortunately, mine is still bouncing at around 40mph. I want to send it out to be rebuilt but I can't pull the Ferrari offline. My Lambo is still..still...still waiting for a clutch slave cylinder. Sure..the cylinder is in stock but not the shim that goes behind it. Add the stalling problem to the TR, I had to pull one of my F 250 trucks from work. Yep when the Ferrari and Lamborghini don't work, get a truck from work. BTW, I still don't know where to send the speedo. I know of north hollywood speedo...but they do VDO. I don't know who does veglia. Shamile Freeze...Miami Vice !
