I've got a 2013 Hyundai Accent with a noise coming from somewhere under the hood. Happens only at a fairly narrow band of engine speed (1100-1200 RPM). I've been trying to hunt around for the source, but I'm running into an issue: Since this car has a drive-by-wire throttle, there's no obvious way for me to bring the engine up to the speed required to hear the noise.

On my other ('94) car, I can just grab the accelerator cable with my hand and goose the throttle to my heart's content. On this car, the throttle body is buried under a mass of plastic covers, sensors and servos, and I'm pretty sure that even if I did manage to manually move the throttle plate I'd just make the ECU angry.

So what's the solution? I don't have a helper to sit in the driver's seat and give it gas while I listen, and any methods involving the ODB port seem to involve a lot of reverse engineering and experimentation.

2 Answers 2


Have a friend / relative help you.

Only suggested as "use a brick etc" is not safe and you have to make sure you get the electronics correct otherwise you can permanently damage the ecu.


If you have wiring diagrams and you know how the throttle motor works (e.g. what voltages it expects), you could feed the ECM TPS signals and power/ground the motor with a variable resister.

You could also just put something on and under the pedal. Then play around until you get the desired RPM. Or just buy a pedal depressor.

  • "pedal depressor" -- great idea
    – Justas
    Apr 22, 2021 at 15:19

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