RPM jump

[PhiDelt]

Does anyone know why when the car is in park or not moving but running, when you turn the wheel back and forth the rpms go up a little bit? Just kind of wondering why that happens.

[joatmon]

just a guess, but it takes some amount of power from the engine to run the power steering pump, so when you turn the steering wheel, the engine has to rev a little bit faster to generate the extra power required. if that's the cause, then I'd also expect to see a rpm rise when you hit the high beams, or maybe crank the heater fan to high, turn on the AC, other things that will put a load on the engine.I find that I don't idle the car much and haven't noticed the rpm rise, but now I'm curious and will look for it tomorrow.

[Raven]

It's to compensate for the engine being under load so it doesn't stall. Turning the wheels when stationary puts a greater load on the power steering pump and other components than when you are moving. When the AC compressor kicks in the same thing happens, the rpms go up.edit- You beat me by a minute joatmon.

[joatmon]

Quote, originally posted by Sunny »edit- You beat me by a minute joatmon. I got millster yesterday in http://forums.genvibe.com/zerothread?id=9026Maybe I'm finallly improving my typing speed. I still need to work on acucracy.

[Raven]

[Maybe I'm finallly improving my typing speed. I still need to work on acucracy.[/QUOTE]Yes thar is ahways ruum for improovement.

[MadBill]

Speling has never ben a hi proirity here on GenVibe, content being more important than form, but fot those that car, it's easy to compose in the 'reply' box, then cut and paste it into an e-mail, use the speelchek, then paste it back in the box. There's probably easier ways, but this works for me. (when I remember to use it!)

[Gim67]

Similar RPM fluctuations will happen when you turn on/off the fan, lights, brake pedal etc. Its normal.

[PhiDelt]

Thanks for all the information on this. Was just kind of wondering why it happened.

[joatmon]

I never noticed it until you mentioned it. I was playing with it today while waiting for a train to end. twisting the steering wheel made the rpms jump more than I thought they would.

[PhiDelt]

Yeah thats how I found out about mine doing that. I was bored waiting for the train to cross and started to turn the wheel and it happened. It does suprise you on how much it actually jumps up.