Speed sensor - Q4

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Alfan
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Speed sensor - Q4

Post by Alfan » Mon Jun 25, 2012 7:51 pm

I have another speed sensor from a Thema 8.32 (should be the same part). However, the wires have been cut and I can't really see how to get to the connection in the unit itself, see photos. Any good ideas? Also I would like to measure if it is ok, does anyone have any info on this unit?

Hmm, I still get this message

Sorry, the board attachment quota has been reached.

Anyone who can help???
1994 Alfa Romeo 164 Q4 Proteo Rosso 550.000km
1989 Lancia Thema 8.32 Verde Indy 270kkm
2001 Alfa Romeo Spider 3.0 24V Blue Lightning 65kkm
2011 Alfa Romeo Giulietta Multiair TCT Bianco Pastello 195kkm
2015 Alfa Romeo 4C Rosso Competizione 100kkm

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wilco
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Re: Speed sensor - Q4

Post by wilco » Mon Jun 25, 2012 8:10 pm

didn't i post a picture of it a while ago ? lemme see if i can find some

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wilco
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Re: Speed sensor - Q4

Post by wilco » Mon Jun 25, 2012 8:16 pm

what i can find now
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Alfan
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Re: Speed sensor - Q4

Post by Alfan » Mon Jun 25, 2012 8:20 pm

Thanks. I wanted to post a photo of the one I got, as the wires are cut almost at the sensor. But the one photo shows that the top can actually be taken off (the plastic inside the metal casing)? And what should I measure if it is working?
1994 Alfa Romeo 164 Q4 Proteo Rosso 550.000km
1989 Lancia Thema 8.32 Verde Indy 270kkm
2001 Alfa Romeo Spider 3.0 24V Blue Lightning 65kkm
2011 Alfa Romeo Giulietta Multiair TCT Bianco Pastello 195kkm
2015 Alfa Romeo 4C Rosso Competizione 100kkm

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wilco
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Re: Speed sensor - Q4

Post by wilco » Mon Jun 25, 2012 8:28 pm

Alfan wrote:Thanks. I wanted to post a photo of the one I got, as the wires are cut almost at the sensor. But the one photo shows that the top can actually be taken off (the plastic inside the metal casing)? And what should I measure if it is working?
not shure what breaks. i just replaced it..
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Alfan
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Re: Speed sensor - Q4

Post by Alfan » Mon Jun 25, 2012 8:31 pm

Ok, I will have to give it a try, as it is useless as is. Thanks for all the photos!

By the way, why did you replace it? Did the speedo all of a sudden just stop working?
1994 Alfa Romeo 164 Q4 Proteo Rosso 550.000km
1989 Lancia Thema 8.32 Verde Indy 270kkm
2001 Alfa Romeo Spider 3.0 24V Blue Lightning 65kkm
2011 Alfa Romeo Giulietta Multiair TCT Bianco Pastello 195kkm
2015 Alfa Romeo 4C Rosso Competizione 100kkm

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wilco
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Re: Speed sensor - Q4

Post by wilco » Mon Jun 25, 2012 8:35 pm

mine worked randomly. so all or nothing.
if it's dancing, then it might be the little plastic gearwheel (or whatever its called lol)

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Alfan
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Re: Speed sensor - Q4

Post by Alfan » Mon Jun 25, 2012 8:38 pm

It just died and didn't come back in mine, that was why I was curious. I hope it's not the gearwheel...
1994 Alfa Romeo 164 Q4 Proteo Rosso 550.000km
1989 Lancia Thema 8.32 Verde Indy 270kkm
2001 Alfa Romeo Spider 3.0 24V Blue Lightning 65kkm
2011 Alfa Romeo Giulietta Multiair TCT Bianco Pastello 195kkm
2015 Alfa Romeo 4C Rosso Competizione 100kkm

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wilco
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Re: Speed sensor - Q4

Post by wilco » Mon Jun 25, 2012 8:43 pm

did you measure the wires?
take the old one of and hook it to a drill.. if its that gearwheel, with a drill you should see something on the speedometer.
Also fast shortcut the 2 connections in the connector will move the speedometer.
Then you are sure that the error is not in the car itself.

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Alfan
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Re: Speed sensor - Q4

Post by Alfan » Mon Jun 25, 2012 8:49 pm

I tried another instrument pod with no change, so I'm assuming it's the sender - or the gearwheel.

But it will be worth testing the sender before doing more. Replacing the gearwheel does not sound like a simple thing...
1994 Alfa Romeo 164 Q4 Proteo Rosso 550.000km
1989 Lancia Thema 8.32 Verde Indy 270kkm
2001 Alfa Romeo Spider 3.0 24V Blue Lightning 65kkm
2011 Alfa Romeo Giulietta Multiair TCT Bianco Pastello 195kkm
2015 Alfa Romeo 4C Rosso Competizione 100kkm

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wilco
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Re: Speed sensor - Q4

Post by wilco » Mon Jun 25, 2012 8:53 pm

replacing is actualy not really worse then the sensor itself. i was lucky i had the sensor replaced with a used one the first time so it was not stuck.
I had to shorten a wrench to get to it.
use a lot of wd40 before you start
Henry Ford, 1939: "Every time I see an Alfa Romeo pass by, I lift my hat."
--Alfa Romeo 164 3.0 V6 24V Q4--
--Alfa Romeo 164 3.0 V6 24V--

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wilco
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Re: Speed sensor - Q4

Post by wilco » Mon Jun 25, 2012 9:06 pm

Made this when i was searching..
might help you
http://www.cashhit.eu/alfa/Q4/Speedsignal164Q4.pdf
Henry Ford, 1939: "Every time I see an Alfa Romeo pass by, I lift my hat."
--Alfa Romeo 164 3.0 V6 24V Q4--
--Alfa Romeo 164 3.0 V6 24V--

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Alfan
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Re: Speed sensor - Q4

Post by Alfan » Tue Jun 26, 2012 8:20 am

Great info, thanks!
1994 Alfa Romeo 164 Q4 Proteo Rosso 550.000km
1989 Lancia Thema 8.32 Verde Indy 270kkm
2001 Alfa Romeo Spider 3.0 24V Blue Lightning 65kkm
2011 Alfa Romeo Giulietta Multiair TCT Bianco Pastello 195kkm
2015 Alfa Romeo 4C Rosso Competizione 100kkm

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Alfan
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Re: Speed sensor - Q4

Post by Alfan » Sun Sep 30, 2012 5:05 pm

I replaced the speed sensor, but that didn't help. I have bought the plastic/nylon wheel and metal part for holding it in place and when looking at my extra transmission, I can see that there is a screw on the side of the sensor hole and by loosening that it should be possible to pull out both the sensor and wheel as one assembly. I haven't done that yet on the transmission in the car, but that will be the next step. Hopefully, that will bring speed and distance back...

I have put some pictures of this in my photobook.
1994 Alfa Romeo 164 Q4 Proteo Rosso 550.000km
1989 Lancia Thema 8.32 Verde Indy 270kkm
2001 Alfa Romeo Spider 3.0 24V Blue Lightning 65kkm
2011 Alfa Romeo Giulietta Multiair TCT Bianco Pastello 195kkm
2015 Alfa Romeo 4C Rosso Competizione 100kkm

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wilco
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Re: Speed sensor - Q4

Post by wilco » Sun Sep 30, 2012 5:22 pm

pull off the connector to the sensor. on the car side, fast shortcut the 2 wires.
The speedometer should popup a little. if not, it's a car sided problem.
Henry Ford, 1939: "Every time I see an Alfa Romeo pass by, I lift my hat."
--Alfa Romeo 164 3.0 V6 24V Q4--
--Alfa Romeo 164 3.0 V6 24V--

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Alfan
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Re: Speed sensor - Q4

Post by Alfan » Thu Oct 25, 2012 8:32 pm

Now I got the speedo running again, so time for an update :)

I replaced the sensor, but that didn't help, so today I replaced the nylon wheel that the sensor goes into. Some of the teeth had broken off.But with the mileage, I guess that's ok. You can see a photo of it here

http://www.alfabb.com/bb/forums/164-168 ... or-q4.html" onclick="window.open(this.href);return false;

So now the mileage is being added again :D

By the way, there is a screw on the side of the gearbox, if that is loosened, it is possible to lift the sensor and wheel out of the gearbox, instead of having to get a wrench in where there is no space.
1994 Alfa Romeo 164 Q4 Proteo Rosso 550.000km
1989 Lancia Thema 8.32 Verde Indy 270kkm
2001 Alfa Romeo Spider 3.0 24V Blue Lightning 65kkm
2011 Alfa Romeo Giulietta Multiair TCT Bianco Pastello 195kkm
2015 Alfa Romeo 4C Rosso Competizione 100kkm

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wilco
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Re: Speed sensor - Q4

Post by wilco » Thu Oct 25, 2012 10:18 pm

nice.
i know about the screw, bad part is, the wheel can fall into the gearcase and then you're kinda screwed :P
But in your case, you had to take it of :)
Henry Ford, 1939: "Every time I see an Alfa Romeo pass by, I lift my hat."
--Alfa Romeo 164 3.0 V6 24V Q4--
--Alfa Romeo 164 3.0 V6 24V--

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wilco
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Re: Speed sensor - Q4

Post by wilco » Thu Oct 25, 2012 10:21 pm

Alfan wrote:Now I got the speedo running again, so time for an update :)

I replaced the sensor, but that didn't help, so today I replaced the nylon wheel that the sensor goes into. Some of the teeth had broken off.But with the mileage, I guess that's ok. You can see a photo of it here

http://www.alfabb.com/bb/forums/164-168 ... or-q4.html" onclick="window.open(this.href);return false;

So now the mileage is being added again :D

By the way, there is a screw on the side of the gearbox, if that is loosened, it is possible to lift the sensor and wheel out of the gearbox, instead of having to get a wrench in where there is no space.
Image
Henry Ford, 1939: "Every time I see an Alfa Romeo pass by, I lift my hat."
--Alfa Romeo 164 3.0 V6 24V Q4--
--Alfa Romeo 164 3.0 V6 24V--

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Alfan
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Re: Speed sensor - Q4

Post by Alfan » Fri Oct 26, 2012 8:39 pm

wilco wrote:nice.
i know about the screw, bad part is, the wheel can fall into the gearcase and then you're kinda screwed :P
But in your case, you had to take it of :)
I tried on the extra gearbox first and it couldn't fall into the gearbox unless it was broken. I put a photo in the alfabb thread.
1994 Alfa Romeo 164 Q4 Proteo Rosso 550.000km
1989 Lancia Thema 8.32 Verde Indy 270kkm
2001 Alfa Romeo Spider 3.0 24V Blue Lightning 65kkm
2011 Alfa Romeo Giulietta Multiair TCT Bianco Pastello 195kkm
2015 Alfa Romeo 4C Rosso Competizione 100kkm

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