[NYCadillac]

For a while now, I have not been able to understand why my RPMS will jump if I turn my steering wheel when at a stop. I can be in Park or any gear and my RPMS will jump to about 1200 when my steering wheel gets moved. Is this normal and I'm going crazy?.. I just cant figure out what my steering would have to do with my RPMS. :hmm:

 

[mcowden]

Some RPM jump is normal when you turn the wheel at idle. The extra effort needed to turn the power steering pump when you do that prompts the PCM to open up the IAC a bit to make up the difference so it doesn't kill the engine. When you stop turning the wheel, the pump isn't working so hard again, and it just takes a second for the PCM to compensate again and return to normal idle.

Try turning the wheels with no power steering while you're stopped. You'll understand why it takes a few extra RPMs to keep the engine running while the power steering pump is working to help you turn the wheels.

 

[NYCadillac]

Thanks Mcowden.. I learn something new everyday with this car.