Ferrari Mailing List: Re: 85 308 GTSi QV Speedo / Odo Problem

[Brian Keegan (bks281]

Also, make sure the wiring connector/plug is clean and not marinating in motor oil and dirt.

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From: Ferrari <ferrari-bounces+bks281=hotmail.com [at] ferrarilist.com> on behalf of Brian Keegan <bks281 [at] hotmail.com>
Sent: Wednesday, January 4, 2023 5:21 PM
To: 4redude <bks281 [at] hotmail.com>
Cc: The FerrariList <ferrari [at] ferrarilist.com>
Subject: Re: [Ferrari] 85 308 GTSi QV Speedo / Odo Problem

 

Charles,

If you try to remove the 4 warning lights, you will break the housings. The only thing these hide are holes in the dash faceplate.

Remove the steering wheel with the 6 countersunk screws and the horn button. The speedo is held in with 2 "L" shaped brackets

that go from the back of the speedo housing to the back of the faceplate. These brackets slide over two studs protruding from 

the housing and are fastened with two little knurled thumbnuts. Simply unscrew the thumbnuts, slide the brackets off the studs, 

unplug the wiring harness from the speedo and push or pull the speedo out of the faceplate, depending on if you are contorted 

under the dash or sitting in the drivers seat.

If you need to send the speedo out for repair, the ONLY place I would send mine is : https://momamanufacturing.com/

Mo-Ma Manufacturing - Home Mo-Ma Manufacturing has been in business since 1972. We have accumulated a wide array of knowledge and experience to tackle those basic repairs to hard to fix problem gauges. momamanufacturing.com

But like Clyde said, most of the time it is the sender.  We probably sell 20-30 per year.

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From: Ferrari <ferrari-bounces+bks281=hotmail.com [at] ferrarilist.com> on behalf of Charles Perry <charles [at] carolinasound.com>
Sent: Wednesday, January 4, 2023 2:32 PM
To: 4redude <bks281 [at] hotmail.com>
Cc: The FerrariList <ferrari [at] ferrarilist.com>
Subject: Re: [Ferrari] 85 308 GTSi QV Speedo / Odo Problem

 

That link I posted below also has the rebuild instructions for the sender, in case anyone wants to bookmark that. There are only like seven electronic components inside the version we had (2 resistors, 2 capacitors, 1 diode and 2 transistors).  You could buy all of those for less than $10 at most electronic stores or on the web. If you can solder, you can save yourself $490 doing a total rebuild. Apparently getting the case crimp open to get to the board is the hardest part.

 

To answer Anthony’s question, we haven’t removed the speedo yet so I don’t know the board construction on that in-depth, but some photos from F-Chat made it look like a single board (no baby boards / connectors). But with older Ferraris you never know. Whatever was on-hand when the car was built was what went in.

 

 

 

From: Matt Boyd <ferrari308driver [at] gmail.com>
Sent: Wednesday, January 04, 2023 10:59 AM
To: Charles Perry <charles [at] carolinasound.com>
Cc: The FerrariList <ferrari [at] ferrarilist.com>
Subject: Re: [Ferrari] 85 308 GTSi QV Speedo / Odo Problem

 

Perhaps my approach was too simplistic, but when I had this issue a long, long time ago (I am almost sure it was my Mondial, which would mean 1996/1997), I drove to Ferrari of Washington, jacked my car up, pulled the sender, checked resistance across the terminals, and then went inside and asked the parts guy to check resistance across a new sender. He refused to do it for me. I figured if the readings were significantly different I'd know for sure that the sender was the issue. We had a debate about this but he flat out refused and said I could either buy the sender or not, but he wouldn't help me in this way.

 

I finally just bought it, installed it, put the car back down, and drove away and it fixed the problem.

 

-matt

'85 euro 308

 

PS-It wasn't $500+ in the 90s, but at over $200 it was still an expensive experiment.

 

On Wed, Jan 4, 2023 at 10:37 AM Charles Perry <charles [at] carolinasound.com> wrote:

We considered that, but a new sensor is around $500, so my friend didn’t want to waste the money. The sensor seems to test good, so we’ll see what the speedo does.

 

 

 

From: Clarence Romero Jr. <clyderomerof4 [at] gmail.com>
Sent: Tuesday, January 03, 2023 11:16 PM
To: Charles Perry <charles [at] carolinasound.com>
Cc: The FerrariList <ferrari [at] ferrarilist.com>
Subject: Re: [Ferrari] 85 308 GTSi QV Speedo / Odo Problem

 

Just buy a new sensor 

That’s the issue 99% of the time

When mine stopped working that was the problem 

 

 

     RF4-4EVR

 

Scars are Tattoos with better stories !

 

If you have no enemies, you have no character !

 

Clyde Romero    

 

 

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On Jan 3, 2023, at 8:28 PM, Charles Perry <charles [at] carolinasound.com> wrote:



Hi gang! I’m helping a friend repair his 308. His speedometer and odometer have both quit. He’s dug through FChat and Facebook groups for diagnostic help. The original consensus seemed to be the sending unit would be bad. So this weekend, we removed the sending unit and tested it per this document:

 

http://www.dinoplex.org/instruments/vegliaspeedosensor/?fbclid=IwAR3C6CZSPeCCVjtFFamIV5ypy371p5Rkn6PZiP_qtv74nJBh5jH3KrVoZW8

 

His is the Type 2 sensor in the document. Per the testing procedure, the sensor is good. It reads a hair over 4V with no metal in front of it, and bringing metal in close proximity to the coil makes the voltage jump to 8V.

 

So now we’re on to what’s next. Some people have said the needle/shaft on the speedo itself binds up and may need lubrication. Some have said the speedo board itself is bad. So some questions for you 308 gurus:

 

1) Is there anything else we should look at?

2) What’s the easiest way to get the instrument cluster out of the dash? I’ve read that if you pull out the smaller warning lights that there are screws behind them that will release the cluster and you can draw it out from the front without removing the steering wheel. Any additional information from those that have been there/done that?

3) If the speedo requires repair, what’s the best course? I know Palo Alto still rebuilds them. But you can also buy boards from Ricambi and some other suppliers. Any recommendations/warnings/suggestions?

 

Thanks!

 

-- charles

 

 

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