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Sebastian Vizcarra
Sebastian Vizcarra, Porsche Meister Tech
Category: Porsche
Satisfied Customers: 350
Experience:  Porsche Factory Certified Master Technician
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I have a 1984 Porsche 928 that has sudden tachometer jumps

Customer Question

I have a 1984 Porsche 928 that has sudden tachometer jumps while driving and when raving the engine at idle in park.
You can be driving at 2000 rpm's and there would be a sudden jump in the tach. There is no increase in speed because I have my foot on the gas at a constant.
928 Owner for 25 years
Submitted: 1 year ago.
Category: Porsche
Customer: replied 1 year ago.
The car starts perfectly, does not miss, but while going down the road at normal speed, the tach will jump and go right down again. The car has also cut out a couple of times going around a corner and then restarts right away. That has been very unusual. It is tach jumping for no reason that is the problem even at high speed, but the car keeps running at 80 all day.
Customer: replied 1 year ago.
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Customer: replied 1 year ago.
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