Frozen/delayed tachometer - Pontiac GTO Forum
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post #1 of 2 (permalink) Old 01-31-2007, 10:38 PM Thread Starter
 
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Frozen/delayed tachometer

This is another little 'glitch' that I've noticed since ownership of the car...

When coming to a harder stop than what is typical, and I don't mean slamming on the brakes, I notice the tachometer will freeze for about 2 seconds before it registers the appropriate rpm. I can purposely make this occur if I manually downshift the car and if it comes to a quick slow down.

Another glitch (which there was a TSB for I'm sure) sometimes occurs when I put the car into 'park' and the speedometer jumps to 60 mph, beeps, and shows an exclamation point and the word 'brake' on the digital screen.

Any input in appreciated.

Jon
'87 Z28 with mods | '05 GTO - Red on Red A4

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post #2 of 2 (permalink) Old 02-02-2007, 07:45 PM
 
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I know for a fact that the speedometer is not mechanical (cable-driven), but computer-controlled (changing from English to Metric while moving for a demonstration), so it is likely that the tach is similarly controlled.

What's probably happening is the car is changing speed and/or engine RPM so fast the sensors can't keep up.

I've noticed that on a hard stop from about 20 MPH or so, the car stops a fraction of a second before the needle is at zero, probably no more than 1/4 of a second.
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