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Old 04-07-2014, 07:22 AM   #1
bpcoving
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5spd Transmission Idle RPM's

I noticed something interesting this morning on my 2013 SE 5spd. Sitting in the parking lot after getting to work this morning, I noticed with the car in neutral and the clutch pressed in my RPMs were in the 900rpm range, but if I let the clutch out it would drop to the 600rpm range and then go right back up to 900rpm or so once I depressed the clutch again. I was just sitting there and didn't touch the gas at all. Do other peoples cars do this? and does anyone know the purpose of this?

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Old 04-07-2014, 07:24 AM   #2
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Yup, it's normal. It's "anticipating" take off, you don't really even have to use the accelerator to get moving either, it will add throttle as the clutch starts to engage. It's just cool technology stuff.
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Old 04-07-2014, 04:17 PM   #3
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Yup, it's normal. It's "anticipating" take off, you don't really even have to use the accelerator to get moving either, it will add throttle as the clutch starts to engage. It's just cool technology stuff.
I learned something new today!
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Old 04-07-2014, 04:46 PM   #4
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Yup, it's normal. It's "anticipating" take off, you don't really even have to use the accelerator to get moving either, it will add throttle as the clutch starts to engage. It's just cool technology stuff.
No it doesn't add throttle input, it is the dual mass flywheel that is connected to a crankshaft which causes it to move when engaged. The anticipating is rumored to either be ecu programming or just vacuum.
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Old 04-07-2014, 04:52 PM   #5
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No it doesn't add throttle input, it is the dual mass flywheel that is connected to a crankshaft which causes it to move when engaged. The anticipating is rumored to either be ecu programming or just vacuum.
Actually, yes it does add throttle, being a fly by wire car with idle speed controlled by the opening of the throttle plate which is in turn controlled by the PCM, once you start to let the clutch out to the point of engagement the PCM will see a dip in engine speed and add more throttle to compensate and avoid a stall. Having a dual mass flywheel has nothing to do with this function.

Also, how would there be a change in vacuum while the clutch is depressed but not while the brake pedal is also pressed? It's all in the programming.
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Old 04-07-2014, 04:56 PM   #6
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But if you hook up to the OBDII it'll still say 0% throttle input.
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Old 04-07-2014, 05:00 PM   #7
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Actually, yes it does add throttle, being a fly by wire car with idle speed controlled by the opening of the throttle plate which is in turn controlled by the PCM, once you start to let the clutch out to the point of engagement the PCM will see a dip in engine speed and add more throttle to compensate and avoid a stall. Having a dual mass flywheel has nothing to do with this function.

Also, how would there be a change in vacuum while the clutch is depressed but not while the brake pedal is also pressed? It's all in the programming.
Agreed.

The idle speed (clutch in or out) is controlled by the PCM in a closed loop manner.
If actual RPM < target RPM, throttle is added (up to a certain point).
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Old 04-07-2014, 05:00 PM   #8
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But if you hook up to the OBDII it'll still say 0% throttle input.

You're most likely reading the PID for the accelerator pedal position sensor.
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Old 04-07-2014, 05:03 PM   #9
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But if you hook up to the OBDII it'll still say 0% throttle input.
The actual pedal position or the throttle plate position can be monitored.
There are "standard OBD2" and manufacturer specific PIDs for this.
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Old 04-07-2014, 05:04 PM   #10
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I'll hook up my scanner and check now.
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