How to find normal idle speed for Civic 8th gen?

Maintenance/Repairs
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My 2011 Civic LX (8th gen) has a 660-670rpm idle in Park, with no loads, warmed till radiator fan comes on. Have been searching the net for an hour and can’t find any definitive reference for normal warmed-up idle speed for this R18A engine. Can anyone direct me to good source? BTW, just did Honda throttle-position-relearn procedure, and it didn’t change the idle. I suspect that idle may be a bit low, but am in process of ruling out possibilities to explain a tad excessive vibration, like loose engine mounts. Would like to just confirm if this is normal idle speed.

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Have you tried cleaning the electronic throttle body?

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That what controls the idle speed.

Tester

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Around 600-700 RPMs at idle in Park sounds about right to me. What makes you think there’s a problem?

On a 2011, you may be just experienced Older Car Syndrome, where stuff doesn’t run like when it was new.

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The best source is likely sitting right next to your head when you are working under the hood of your Honda. Unless your Civic was in a collision, there should be an emissions-related label on the underside of the hood. It might look slightly different from this GM label, but it should be reasonably similar:

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This one might look more similar to the label that is glued to the underside of your hood.

image

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That emission sticker is for a 1986 model year vehicle.

Back when you COULD adjust the idle speed.

Tester

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Is the idle speed on the OP’s 2011 Civic manually adjustable?
If not, then your suggestion of cleaning the throttle body is likely the only solution.

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This is for a 2005 model year Honda.

Tester

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For the 1.8 L w/EPS I’m seeing 670 +/- 50 rpm , warm engine, trans in neutral, no unnecessarily electrical loads. Will probably increase a little if you turn the headlights on bright.

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Thanks everyone for replies on this. My 2011 Civic does not have the idle speed posted on the emissions control info. I’ll check/clean the throttle body when I’m tooling around there next. Doing the throttle relearn procedure may have raised the idle a tad. Now that I’ve driven it quite a bit since, I think I am noticing fewer vibrations.

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