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Engine tachometer climbs to 2000 main relay clicks RPM drop

Tiny
M5ANDA4
  • MEMBER
  • 2001 HONDA CIVIC
  • 123,000 MILES
2001 honda civic Start the engine tachometer climbs to 2000 approx main relay clicks rpm drops, climbs again click and drops, does this for approx 1 minute then engine goes into safe mode and idles tachometer just shuts off. This has occurred since I swapped out engine and have experienced this problem since start up. Checked ground and sensor connections alternator is operating.

Nice site :-) btw
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Saturday, February 25th, 2012 AT 6:17 PM

3 Replies

Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Scan it for codes.
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Sunday, February 26th, 2012 AT 5:22 PM
Tiny
M5ANDA4
  • MEMBER
  • 3 POSTS
There is no communication with the reader tried that. Since I swapped out the engine does the PCM need to be sync'd to the new engine?
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Monday, February 27th, 2012 AT 2:00 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Did you replace it with the exact same engine?
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Monday, February 27th, 2012 AT 2:07 PM

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