My car seems to idle ok, but sometimes...the Tach, falls to zero RPM's? - Ford Mustang Forum
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post #1 of 2 (permalink) Old 12-05-2019 Thread Starter
mach's Avatar
Joined: Oct 2006
Location: Chattanooga
Posts: 37
Question My car seems to idle ok, but sometimes...the Tach, falls to zero RPM's?

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 have also changed the clutch. The original had 156,000 miles on it. I thought it might be dragging, but the new clutch didn't help. It might be my imagination, but the car seems to have loss, some low end TQ. I have to really slip the clutch, to get her to pull off, especially on a hill
I would appreciate any help you guys can offer.

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post #2 of 2 (permalink) Old 12-17-2019
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s197gt's Avatar
Joined: Nov 2008
Location: Eureka
Posts: 1,445
Are you stating that the engine idles properly, yet the tach shows that it is not ?

If that is my correct understanding, then the tach itself is at fault.

You don't state what year car you have ?

Early s197 body cars had a problem with stepper motors, the tiny motor within each instrument cluster gauge.

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