I have a 93 Accord F22A1. I’ve noticed a silent thud in idle for quite some time. It does not seem to be the cause of any issues. You could say it has a semi regular pattern – thud here…wait for it…thud there. Understand it is hardly even a sound, it’s more of something I can feel while sitting in the driver’s seat or putting my ear to the engine. It sounds like it is coming from deep in the motor on the bottom. Again, I have no real issues (at the moment), no trouble codes. But, I’m curious about this. Old car and preventative maintenance is my friend. Thanks!
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