Thread: Tach Bounce, key ON, engine OFF

Hey guys, as the title states, the tach in the car will "bounce" about once a second, while the Engine is OFF, with the key in the ON or RUN position. I did a couple searches on here, and google. Found someone with a similar issue, but no fix.

Car is a 97 GrandPrix GT with the 3800 Series II.

Removed, cleaned, and refastened grounds already. Stuck my head under the dash and checked every harness connection I could, nothing loose or damaged.

Should I be concerned that the crank sensor is on its way out, or? Been doing it for 6 months now, for as long as I have owned the car.

Should add, car starts and runs fine, no driveability issues to be had.


Insight?


Jay

Me, I'd stop turning the key on and staring at it if everything seems good.

My 97 does it all the time. Brand new crank sensor. I wouldn't worry about it.

my 97 does it also. I wouldn't worry about it

My 97 L67 does the same thing...

See...It's a disease in the 97's... and they all have it.

It's a special feature that only us 97's have.