Tick Tick
Thread Starter
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Joined: Sep 2007
Posts: 79
Likes: 0
From: Hampton Virginia
Tick Tick
02 Z06, have a ticking sound coming from behind the dash. I'm guessing it is Speedo related, the ticking seams to ajust with the speed of the car. Any Ideas out there before I start tearing the dash apart. 
Carl.
Carl.
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
You sure the clicking is related to car speed, or engine speed ???? Bring car to a stop, put in NEUTRAL (PARK) and slowly rev engine to, say, 2,000 RPM. Does the speed of the "click" change ??
If so, could be injectors, valve train noise, hard to say ....
Thread Starter
Advanced
Joined: Sep 2007
Posts: 79
Likes: 0
From: Hampton Virginia
No, it sounds like it is coming from right behind the gages. It goes away at stop and speeds up as you go faster. I also do think it is injectors, because it is single clicking sound and not multiple that the injectors would put out. Is there any kind of gearing in the speedo?
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
No, it sounds like it is coming from right behind the gages. It goes away at stop and speeds up as you go faster. I also do think it is injectors, because it is single clicking sound and not multiple that the injectors would put out. Is there any kind of gearing in the speedo?
At the heart of every BRANDX Gauge is our high-performance,
patented air-core movement - the gauge's motor.
Looking inside the motor reveals two coils ("A" & "B") comprised of copper wire wrapped around the front bobbin, and a rear bobbin assembly that contains a magnetized armature assembly (magnet & shaft), surrounded by dampening fluid which acts to minimize pointer flutter and ensure smooth response.
The bobbin assembly is packaged in a metal isolation can that supports the gauge's dial (and light pipe where appropriate), and the can is mounted inside a housing (case).The armature assembly freely rotates within the coils, aligning with the varying magnetic fields produced by the amount of current flowing through the coils. (Current variance is triggered by signals provided by the sender.)
The pointer - attached to the shaft on the armature assembly - once calibrated, will provide a directional indication regarding the amount of pressure, temperature, appropriate level of fuel or voltage being
measured.
Senders that drive BRANDX Electric Gauges are based on variable resistance technology. The three basic variable resistance senders are temperature, pressure and fuel level.
Each sender possesses a different rate of resistance change or "MATCH", for the specific gauge's electrical design. The sender's resistance change results in current changes within the sender-gauge circuit.
These changes cause an increase or decrease in the gauge's magnetic field. The variance is the magnetic field causes pointer movement.
In other words, the only moving part is the needle and the armature that drives it, there are no "rotating" parts.
Don't know what you're hearing, but it is not the speedo ....
Melting Slicks
Joined: Oct 2006
Posts: 3,447
Likes: 6
From: Los Angeles
Having taken apart my dash several times, I can also confirm the entire gauge system is electronic. It is not the gauges or ANYTHING behind them on your side of the firewall. Start troubleshooting the sound, this guy had the best place I would start....
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