2008 R18 clicking sound - 8th Generation Honda Civic Forum

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Old 06-19-2017, 05:21 PM   #1 (permalink)
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2008 R18 clicking sound

I have a 2008 Civic sedan EX-L that I replaced the engine in a few months ago. It runs and drive extremely well except for one little thing.

In the morning when the car has been sitting all night there is a clicking sound coming from under the hood.

It only makes the sound when:
Car is 100% cold
Car is in drive or reverse, doesn't do it in neutral
Sound goes away immediately when the rpm's go over ~1200-1300 (its like an on/off switch)
Once the car is warmed up after a few miles it goes away
When I leave work after the car has been sitting for 8 hours there is no sound
Doesn't seem to be affected by ambient temperature (has been doing it from February to present, anywhere from 20F to 95F degrees)
And it doesn't do it everyday, just seems to be random

Any ideas what the problem may be? It is not an engine sound or an engine ticking.

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