How to accelerate RPM under the hood

Not sure what you are asking.

Do you mean raise the idle rpm?

qplo said:

Any one know how to accelerate rpm under hood honda crv 2015. Not sure we can do it or not. Thank you

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You need to have a helper to push the accelerator pedal at your command.

So in the modern new car, no way to raise the idle rpm by your self without another person behind the wheel. Unlike old car, we have sort of string to pull to raise the rpm.

If the throttle butterfly is "drive by wire", the throttle pedal inside the car must be pushed to rev the motor. I would think an idle speed increase/decrease (drive by wire) would have to be done via ECU re-programming.

Even before drive by wire CRVs were difficult to rev while under the hood (not able to access cable)

Pretty much all modern cars since about 2007ish are drive by wire. So you need a helper or a proper and expensive scan computer to increase engine rpm while looking at the engine.

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