car idles, but tach falls to Zero. Racing the engine brings the tach to life, but it falls to zero,

mach2race

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My car seems to idle ok, but sometimes...the Tach, falls to zero RPM's, but the engine is still running. If i race the engine, the Tach jumps back up with the motor, but then falls back to zero, in an idle. I thought maybe I had a weak coil pack. I changed it with a screaming demon, new plugs and wires. That seemed to fix it for a couple of months, but now its doing it again ?
I would appreciate any help you guys can offer. I also replaced the clutch, because the original had 156,000 miles and i thought maybe the clutch was dragging, but car still idles (sometimes) between 300 to O RPM's
Thanks!
TB
 

Dino Dino Bambino

I have a red car
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Sounds like your tachometer has a bad stepper motor. It's not uncommon for the gauge stepper motors to go haywire on these cars especially in cold weather.
You can get a set of new x27 stepper motors from eBay. Removing and stripping down the gauge cluster is fairly straightforward. If you're handy with a soldering iron, you can do the job yourself. Otherwise pay a professional to do it.
 

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