tachometer

HONDA CRX
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ZEPOL
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1990 honda CRX. 143,000. 5spd. My tachometer is all over the place. There is no noticeable change in engine speed. There are no strange sounds. I have observed this under many conditions and there are not any that correlate. Just have a very hyperactive tachometer. Thanks in advance.
Jun 14, 2007 at 4:02 PM
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BRUCE HUNT
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If the speedometer is not jumping around, I think the tach is bailing on you. Had a 1990 and had to replace it doing the same thing.
Jun 15, 2007 at 8:54 AM
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ZEPOL
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thx for your response. i had heard that it could be caused by fault in the ignition system. i replaced the plugs, wires, distributor cap, and ignition rotor. this work for about 100 miles. might continue in this direction a bit more...if you have any thoughts...thx again
Jun 19, 2007 at 4:53 PM
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ITZ_2_EAZY
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hi the tach jumping is do to the coil underneath the dizzy cap. only takes 5 min to change will fix your problem.
Aug 7, 2007 at 5:58 PM