Quote:
Originally Posted by pfarah
If these sensors are original equipment, my humble suggestion is just to bite the bullet and purchase new ones.
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If the sensor are original, then absolutely it is time to replace them. Additionally, the wiring ages & corrodes (at times, beneath the sheath and not visible). So, if the reference sensor wiring is original, then I highly suggest replacing it as well.
Then you shouldn't have to worry about it for another 20+ years.
Quote:
Originally Posted by tamathumper
How much tach bounce is enough? I've seen mine go as high as 1,500 RPMs, and as low as just "a wiggle".
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Here is a quick video of what a good tach bounce looks like:
Porsche 944 Turbo 951 Tach Bounce (engine cranking). - YouTube
Additionally, I recently put up a page about the crank-sensors:
Rogue Tuning - Crank Angle Sensors