RPM's slow to drop when shifting
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Thread: RPM's slow to drop when shifting

  1. #1
    NECO Member
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    RPM's slow to drop when shifting

    Greetings everyone! Please bear with me as this is my first post on this forum and I am sure the questions I will ask have been covered numerous times before. So if you can point me in the right direction for the answers it would be greatly appreciated. My son recently purchased a 99 Cougar V6 with 74K miles. Overall the car runs well. However, between gears the RPM's are very slow to drop. Occasionally they even increase slightly before dropping. Where should I begin looking to solve this?

    Thanks!

    PS: I am currently an active member on Audizine (under the same name) Any other Ziners on here?

    Cheers!
    Last edited by old guy; 2009-01-04 at 01:14 PM. Reason: added mileage

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  3. #2
    Sometimes Faster than Dan Lifetime Platinum MemberSuper Moderator B3NN3TT's Avatar
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    Re: RPM's slow to drop when shifting

    It's not a bug, it's a feature!

    Ford designed the Idle Air Control Valve to hang a little, to burn off excess fuel and improve emissions scores.

    If it hangs excessively, you might need to replace the IACV.
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  4. #3
    Capital Curmudgeon Lifetime Platinum MemberModerator skater's Avatar
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    Re: RPM's slow to drop when shifting

    You're describing the throttle hang.

    Some hang is normal - I've had my Cougar for 9.5 years and 91,000 miles, and it has always done it. It's done for emissions reasons.

    However, some people have excessive hang. It shouldn't last for more than a second or two, but some people have problems where it lasts longer and actually interferes with driving.

    Edit: Yeah, what B3NN3TT said!
    1999 Cougar, Laser Red, 3.0L V6, MTX (a lot more fun)
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  5. #4
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    Re: RPM's slow to drop when shifting

    Thanks for the quick response. I will search for info on the IACV. I assume it isn't adjustable?

  6. #5
    NECO Member 99black's Avatar
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    Re: RPM's slow to drop when shifting

    search "throttle hang"

    edit ya beat me

    2000 Original Roush -Svt lite-Short ram-Borla duals

  7. #6
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    Re: RPM's slow to drop when shifting

    Quote Originally Posted by 99black View Post
    search "throttle hang"
    Will do. Thanks!

  8. #7
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    Re: RPM's slow to drop when shifting

    OK. Just found instruction in the DIY section. Printing them out now.

    Thanks everyone for sending me in the right direction!

  9. #8
    Capital Curmudgeon Lifetime Platinum MemberModerator skater's Avatar
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    Re: RPM's slow to drop when shifting

    I'll just say that putting a copper cap with a hole drilled in it - the usual prescribed solution - is NOT the correct solution to excessive throttle hang.
    1999 Cougar, Laser Red, 3.0L V6, MTX (a lot more fun)
    2014 Ram 2500 Big Horn 6.7L Diesel (Towzilla)
    2012 Honda Accord V6, ATX (daily)

  10. #9
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    Re: RPM's slow to drop when shifting

    Quote Originally Posted by skater View Post
    I'll just say that putting a copper cap with a hole drilled in it - the usual prescribed solution - is NOT the correct solution to excessive throttle hang.
    I am open to any and all suggestions! I just want to get it to drop a little quicker.

    Again, Thanks!

  11. #10
    Capital Curmudgeon Lifetime Platinum MemberModerator skater's Avatar
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    Re: RPM's slow to drop when shifting

    Quote Originally Posted by old guy View Post
    I am open to any and all suggestions! I just want to get it to drop a little quicker.

    Again, Thanks!
    As B3NN3TT and I said above, if it's dropping within a second or two, it's normal and you shouldn't change anything.
    1999 Cougar, Laser Red, 3.0L V6, MTX (a lot more fun)
    2014 Ram 2500 Big Horn 6.7L Diesel (Towzilla)
    2012 Honda Accord V6, ATX (daily)

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