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Tacometer jumping around

Tiny
IBM3554
  • MEMBER
  • HONDA ACCORD
92 Accord EX 2.2, 189,000 miles. On cold mornings the tacometer jumps around while accelerating. I can feel the engine surging slightly when this happens. Could it be a ignition problem. What component sends the signal to the tac? Thanks
Wednesday, April 11th, 2007 AT 3:50 PM

2 Replies

Tiny
BRUCE HUNT
  • MECHANIC
  • 3,753 POSTS
If the engine is surging the tach should jump accordingly. The surging is generally related to a vacuum leak or air in the cooling system. Even a lack of coolant can cause this.
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Wednesday, April 11th, 2007 AT 4:57 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
When the coil secondary winding collapses the control module off signal will go to the Tachometer as an indication of engine speed RPM.
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Wednesday, April 11th, 2007 AT 8:40 PM

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