engine tachometer climbs to 2000 main relay clicks rpm drop

2001 HONDA CIVIC
123,000 MILES
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M5ANDA4
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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
Feb 25, 2012 at 6:17 PM
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RIVERMIKERAT
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Scan it for codes.
Feb 26, 2012 at 5:22 PM
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M5ANDA4
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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?
Feb 27, 2012 at 2:00 PM
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WRENCHTECH
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Did you replace it with the exact same engine?
Feb 27, 2012 at 2:07 PM