Question about 1994 Nissan Altima

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Automatic transmission shifts up and down between gears on the highway, causing RPM to jump up and down

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  • 2,359 Answers

The problem may not be at the transmission end.

Most likely to be the coil pack or bad ground to ECU and other computer(s)

The quickest test is to park your car in a flat location.

Start the care and move the wiring set (NOT spark plug wires) one at a time.

If the RPM jump them you have a bad ground + wiring connection problem.

Coil does fail after so many miles.

On OBD-1 car you need to look up the fault code by counting number of flash.

Try to clean up and tighten grounding wires to the frame 1st.


Posted on Jul 15, 2009

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