How do i change my gear knob in my 93 prelude Si

it could be a defective sensor. possibly an open or the gear on that drives the sensor is not turning.

i suppose you have a gearbox problem

for an 87 I can imagine that you are probably running it at between 175K-350K miles so you should be getting

Castrol/1 qt. SAE 5W-30 GTX superior sludge protection motor oil

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12082

Its probably your speed sensor mounted on the back side of your transmission on top of the final drive gear. Its the sensor/plug located just under the shift linkage. Make sure its bolted down tight and check for any loose connections.

most manual transmission shifter knobs are screwed on, twist to the left, look at the bottom of the knob, because some have a brass locking nut, if it does hold it with a wrench and twist to the left.

Try changing the Transmission oil - can solve a host of problems, including rough changes.

Look at the rear top of the gearbox/clutch bellhousing, below and behind the distributor. Well hidden, two bolts to fix, with a plug on the top.

As the commenter said, check if the tranny fluid is full. A clear pink or red is best, a dirty brown or cloudy color is probably trouble. It's a '93- it is 24 years old, everything wears out eventually. I'm as old as the hills myself, and I can't run anymore. Start looking for a replacement transmission, or have a transmission shop diagnose it. Unless you are attached to the car, don't let them talk you into a new transmission-the cost may be more than the car is worth. You might want a used unit- try to get ANY kind of warranty-even 30 days is better than nothing. If it lasts beyond 30 days without a problem, it might go another 24 years---pshaw! not really.

If it doesn't unscrew then call the dealer --- ask for service and ask them .. KC

my 93 prelude was doing the exact same thing and for me it was my alternator was working properly.
go to a parts store and have them test it.