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steering wheel movement causes slight rpm drop?

This is a discussion on steering wheel movement causes slight rpm drop? within the General Help forums, part of the LSx Technical Help Section category; Tonight while going out I noticed if I'm sitting at idle and turn my steering wheel in any direction a ...

  1. #1
    Member Aetos's Avatar
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    steering wheel movement causes slight rpm drop?

    Tonight while going out I noticed if I'm sitting at idle and turn my steering wheel in any direction a bit my RPMs will drop by like 100-200.

    Car is 99 M6 with 45k miles. What could be causing this erratic rpm behavior?

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    Impounded
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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    Mine does it.. Power steering pump = parasitic drain...


    normal i do believe....

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    cutting and welding mark21742's Avatar
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    dont know if it does it quiet that much but my goat does it too, Josiedoom has it right

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    Impounded
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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    Mine does it when its at hot idle. Cold idle it just changes the sound of the exhaust like its putting drag on the engine.

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    Moderator Firebirdjones's Avatar
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    Ya,,,years ago even on some carbed cars there was a power steering switch that would kick idle up when the pressure rised on the power steering pump,,,,don't know why GM got away from that but my guess would be gas consumption and meeting certain requirements. Every little bit helps I guess.

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    TunedbyFrost.com Tuner Frost's Avatar
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    Quote Originally Posted by Firebirdjones View Post
    Ya,,,years ago even on some carbed cars there was a power steering switch that would kick idle up when the pressure rised on the power steering pump,,,,don't know why GM got away from that but my guess would be gas consumption and meeting certain requirements. Every little bit helps I guess.
    They do it in the PCM now, just like the A/C (which used to have the throttle bump noid too).

    It's in the tq mngmnt section (engine not trans!) and it plays into the frictional loss model. The IAC does step a bit to augment it, but I believe that it's a static offset at idle, which is why you see the droop.

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    Member Aetos's Avatar
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    Thank god, I thought I found another problem with my car




    on a side note my 02 sensors just arrived, yay.

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    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by Frost View Post
    They do it in the PCM now, just like the A/C (which used to have the throttle bump noid too).

    It's in the tq mngmnt section (engine not trans!) and it plays into the frictional loss model. The IAC does step a bit to augment it, but I believe that it's a static offset at idle, which is why you see the droop.
    Thats good to know. I noticed it was in the tune for the A/C but didn't realize or see anything for the power steering.

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