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Thread: Added header - Now idle is too high - HELP

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    Registered User KingTutVII's Avatar
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    Default Added header - Now idle is too high - HELP

    I just installed a MSA 3-2 header and exhaust system on my 1972 240z and now my idle is too high. It used to idle around 800 rpms, now it idle around 1200-1300 rpms. Overall it seem to run great. Just idles high. Is there a quick idle adjustment on these SUs ? Any help would be greatly appreciated.

    I know there is tons of info. already in this forum, but it is very hard to find any specifics... Thanks again in advance
    1972 240z
    MSA 3-2 Header
    Performance Cam
    Wish List A Mile Long

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    Do you perchance have the linkage not connected to both carbs the same, possibly holding one open?
    Bruce Palmer
    Salem Or
    Sales@ztherapy.com
    www.ztherapy.com
    503-587-9800

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    Registered User Gary in NJ's Avatar
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    I would expect that after installing headers a full carb adjustment would be in order.
    Gary
    Guardian of HLS30-91415
    Previous Owner of a 10/70 240Z ('83-'85)

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    Registered User KingTutVII's Avatar
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    Quote Originally Posted by Bruce Palmer View Post
    Do you perchance have the linkage not connected to both carbs the same, possibly holding one open?
    It ran like a champ prior to header and exhaust installation. It still runs very well, just the idle is 400-500 rpms higher. I have checked the linkage and all seems to be fine.
    1972 240z
    MSA 3-2 Header
    Performance Cam
    Wish List A Mile Long

  5. #5
    Registered User ajmcforester's Avatar
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    You can't expect to change one thing like the header and not impact something else. Not to mention you had to move the intake to put the headers on and you can't expect it all went exactly like it came off. You need to fully tune the carbs.

  6. #6
    Fired Up! JLPurcell's Avatar
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    Question Is it one word or two?

    "Z-Therapy"
    I understand they offer a visual set up guide for SU's.
    I agree that with the removal and installation of the headers you need to set up and balance your SU's.
    JLP
    Jerry Purcell
    1970 HLS30 00029 Owner since 1976 Now owned by Les Canaday (Classic Datsun Motorsports)
    1972 HLS30 93606 IZCC Registion #105 Original owner back home after full restoration by Classic Datsun Motorsports

  7. #7
    Registered User tlorber's Avatar
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    Just try backing off the idle adjustment on the carbs (evenly). Hopefully you have a flow meter to sync them. If not you should get one.

  8. #8
    Registered User LeonV's Avatar
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    Sounds like a vacuum leak to me. Start by spraying starting fluid (or something similar) around the parts that were removed or tampered with when you installed the header. I'd suspect a hose that is cracked or not quite sealing, or the intake/exhaust gasket especially if you didn't install a new one.

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