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Thread: High-idle vacuum motor thingy

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    Question High-idle vacuum motor thingy

    Not sure what it's called. but it's a vacuum motor on top of the engine that yanks up on the throttle linkage. I assume it's the high idle throttle for starting. It was disconnectified when I got the car. I hooked it back up and it seems to do nothing. Engine runs great when warm, but barely starts when cold. Is this an essential component to Z-related happiness? I know Zs need to be choked until they warm up a bit, but would a properly functioning unit improve my starting situation? There's a red adjustment screw on it that I assume would adjust it in some way. It's a '70 HLS30, stock as a rock.

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    Registered User beermanpete's Avatar
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    The part you are refering to is called the throttle opener. It is suppose to hold the throttle open slightly during decel. You won't see it do much, if anything, while blipping the throttle from under the hood. The factory service manual has informaton about it in the emission section and the fuel system section. This part is not likely to affect cold starting.

    Make sure the choke is adjusted correctly and that the jet nozzels move freely when operating the choke. See the fuel section for details.
    Last edited by beermanpete; 09-04-2013 at 09:08 PM.

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    Default Thank you! You're a gentleman and a scholar.

    Quote Originally Posted by beermanpete View Post
    The part you are refering to is called the throttle opener. It is suppose to hold the throttle open slightly during decel. You won't see it do much, if anything, while blipping the throttle from under the hood. The factory service manual has informaton about it in the emission section and the fuel system section. This part is not likely to affect cold starting.

    Make sure the choke is adjusted correctly and that the jet nozzels move freely when operating the choke. See the fuel section for details.
    Ah! That makes much sense. I've been trying to find it in the shop manual. I thought it could not be doing much during startup, since it's vacuum-driven. Thank you sir, you've been most helpful. I just got the tranny rebuilt, and want to take it on a nice long drive.
    - Theron

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