Originally Posted by iridium.c63s

Here’s the video!

Originally Posted by Pyts

@Mister Coffee Hey, man! Well, it was standard procedure for the turbines I used to service. Though I don't recall it's being explained to me it does seem reasonable to want the fuel system fully pressurized before ignition, particularly for cold-starts where the air is more dense and the engine needs more fuel to compensate. Our Toyota keeps the fuel system pressurized at all times, so there's at least one automaker who thinks it important. I'll skim the Honda's owner's manual to check for a mention.

For the Fit I've only noticed an audible difference at the moment when the engine turned over during very cold weather (20-35°F). The engine would make an awful din, so I tried pressurizing first and found that to resolve the issue. The timing of the fault would have lead one to think of the starter, but it sounded like top-end noise. It was an unusual rasp. Being that I'd recently adjusted the valves and was/am confident that they were done carefully, I tried something else that affected cranking and was easy.

Regardless of whether letting the fuel line pressurize is advised in the manual, I'd be hard-pressed to think of an argument against it. We certainly want appropriate controlled pressure whenever the engine is running.

Originally Posted by GAFIT

That doesn't sound good! I would make sure the spark plugs are tight. That generation is notorious for ejecting spark plugs. The noise can even come and go for a bit before it finally ejects the plug.

I'm also hearing two different sounds. One could be the loose plug and the other could be an improperly done valve adjustment. I'd start by checking the plugs though.

Originally Posted by Pyts

If we're thinking the knock (sounds like knock to me) is engine component wear, you can check for metal in the oil. Can run the oil through a fine strainer or you could try a coffee filter. I imagine the latter may be a time consuming mess, but you likely have them on hand. You could also pick up a test kit from blackstone labs and send the oil away for testing which costs around $25-30. If there's metal particulate, they could tell you what kind and the likely source.

I'd still like to check on that PCV valve as the pinch test is fast and free. Following that, cleaning around the throttle plate, the plate itself, and banging the air filter out on your shoe only takes a couple minutes combined.