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Tachometer

Tiny
ZEPOL
  • MEMBER
  • HONDA CRX
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.
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Thursday, June 14th, 2007 AT 4:02 PM

3 Replies

Tiny
BRUCE HUNT
  • MECHANIC
  • 3,753 POSTS
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.
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Friday, June 15th, 2007 AT 8:54 AM
Tiny
ZEPOL
  • MEMBER
  • 2 POSTS
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
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Tuesday, June 19th, 2007 AT 4:53 PM
Tiny
ITZ_2_EAZY
  • MEMBER
  • 3 POSTS
Hi the tach jumping is do to the coil underneath the dizzy cap. Only takes 5 min to change will fix your problem.
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Tuesday, August 7th, 2007 AT 5:58 PM

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