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High RPMs.

This is a discussion on High RPMs. within the General Help forums, part of the LSx Technical Help Section category; Hey guys. I need some help. For the last few days my car Bern acting funny. When I'm driving and ...

  1. #1
    Senior Member 98maro's Avatar
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    High RPMs.

    Hey guys. I need some help.
    For the last few days my car Bern acting funny.
    When I'm driving and I get to stop the car. When I hit the clutch. The RPMs stay high on 1500 rpms. After few seconds it goes down slowly to normal.
    And some times go really low aroun 300 rpms seems like it's gonna turn off but then goes back to normal again.
    And the gas mileage is bad. Since that is happening.

    I cleaned the mass air sensor.
    I checked for vacuum leaks. Nothing visible.
    I dnt heard any noise of vacuum leak.
    No engine codes.
    What could it be?
    00 ss blk m6 " STOCK" strano springs, slp bilstein shocks, adj LCA, adj panhard bar, relocation brackets, 2 point SFCs welded,OEM zo6 rims black, magnaflow exhaust, CME exhaust,E/cutout, slp grille, custom front plate mount, HIDs, whistler mod, side moldings delete, slp air lid, ported and polished TB, strut tower brace, 3.73s gears, and some other parts to list!
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    Senior Member 98maro's Avatar
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    ....

  3. #3
    I don't sell out! blackSS01's Avatar
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    I would say 02 sensors but that would throw a code. MAF might be on its way out

    I know MAFs don't always throw codes when they are garbage (Seen it first hand)
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    Senior Member 98maro's Avatar
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    I thought it could be the MAF.
    How can I make sure that's the problem?

    O2 sensor should throw a code right ?

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    Air leak after the MAF, vacuum leak, dirty throttle body and/or idle air control valve. All possibilities.

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    Quote Originally Posted by pajeff02 View Post
    Air leak after the MAF, vacuum leak, dirty throttle body and/or idle air control valve. All possibilities.
    Was thinkin this...
    :\Users\Steven\Pictures\d6ftg5nh.gif


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    Senior Member 98maro's Avatar
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    Tb is cleaned. Put it 500 miles ago.
    It's ported.
    No leaks between the tb and lid.
    Nothing visual on the vacuum hoses.

    When I put the ported tb. Everithing was fine.
    It started doing this bout 40 miles ago

  8. #8
    Senior Member 98maro's Avatar
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    How can I check air control valve?

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    Senior Member 98maro's Avatar
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    Dumb question. Could that problem be related to the stering pump?
    I noticed right now that is making noise.
    When I turns the steering wheel the rpms go higher than usual

  10. #10
    Senior Member bluehawk2000's Avatar
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    Quote Originally Posted by 98maro View Post
    Dumb question. Could that problem be related to the stering pump?
    I noticed right now that is making noise.
    When I turns the steering wheel the rpms go higher than usual
    It might be on it's way out and putting strain on the motor!!

  11. #11
    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    Quote Originally Posted by 98maro View Post
    How can I check air control valve?
    The IAC sensor is cheap better to just replace it..

  12. #12
    cutting and welding mark21742's Avatar
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    FYI, if you need p/s fluid, our cars use tranny fluid, NOT p/s fluid in the p/s system

  13. #13
    Senior Member 98maro's Avatar
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    im a check the fluid tomorrow, so if it does need some auto tranny fluid is good right?

    i remeber a while ago was making that noise and same thing happn, but after a while the noise was gone,
    i think the pump is almost out

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    Senior Member 98maro's Avatar
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    Quote Originally Posted by Smittro View Post
    The IAC sensor is cheap better to just replace it..
    where do i check that or how can i replace it smittro?

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    The IAC valve is located on the driver side of the throttle body. I have not had a problem with ours, so I am uncertain of the diagnostic procedure. I understand that they can get gummed up though and cleaning the sensor with a spray throttle body or MAF cleaner (preferred as it does not leave any residue) may alleviate the problem. Do you run a K&N or similar type air filter?

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    Moderator Cutlass's Avatar
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    Quote Originally Posted by mark21742 View Post
    FYI, if you need p/s fluid, our cars use tranny fluid, NOT p/s fluid in the p/s system
    uummmmm....no. our cars (f-bodies) use p/steering fluid. The GTOs might use ATF though

  17. #17
    Senior Member 98maro's Avatar
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    Quote Originally Posted by pajeff02 View Post
    The IAC valve is located on the driver side of the throttle body. I have not had a problem with ours, so I am uncertain of the diagnostic procedure. I understand that they can get gummed up though and cleaning the sensor with a spray throttle body or MAF cleaner (preferred as it does not leave any residue) may alleviate the problem. Do you run a K&N or similar type air filter?
    I use regular air filter.

    I have carb cleaner I can use that to clean it up right?

  18. #18
    cutting and welding mark21742's Avatar
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    Are you sure Cutlass? I was sure that GM uses ATF in pretty much all of their p/s units.
    Either way it should say on the p/s resivior cap.

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    Senior Member JayTA98's Avatar
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    Quote Originally Posted by 98maro View Post
    I use regular air filter.

    I have carb cleaner I can use that to clean it up right?
    I don't use carb cleaner on FI engines. Last time I used it I flood it and it took forever to start.

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    Moderator Cutlass's Avatar
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    Quote Originally Posted by mark21742 View Post
    Are you sure Cutlass? I was sure that GM uses ATF in pretty much all of their p/s units.
    Either way it should say on the p/s resivior cap.
    Yep, I'm sure. Ford is the one that uses ATF in there power steering systems. Almost all GM vehicles use power steering fluid with a few exceptions like the Cadillac Catera and the GTO (I think)....those are the only 2 I can think of that use ATF.

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