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Thread: 87 yj has high idle

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    87 yj has high idle

    just bought an 87 yj 4.2l manual
    guy i bought it off of made a mess of it and im trying to piece it back together.
    it idles at about 2000 rpm, doesnt matter if its cold or hot, the choke plate is about three quaters of the way closed all the time, if i hold the choke plate open all the way the idle comes down to about 1000.
    any ideas why the choke seems stuck almost closed.
    all vacuum lines are connected and linkges are too.
    any ideas would be appreciated

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    Stickybongsmoking's Avatar
    Stickybongsmoking is offline Yes, this is gawd damn muthafockling CTD NUT.
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    Assuming this is an OEM carb and has not been gibbled with, you need to look at what controls the choke. The choke control is that round black box on the side of the carb. First check and make sure there is power going to it with the ignition on. If there is, it is likely that the coil thermostat inside of the choke control is toast. Not uncommon on a 30 year old vehicle. Replacement coils are inexpensive and competent parts guy should be able to source one for you.
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    Quote Originally Posted by Stickybongsmoking View Post
    Assuming this is an OEM carb and has not been gibbled with, you need to look at what controls the choke. The choke control is that round black box on the side of the carb. First check and make sure there is power going to it with the ignition on. If there is, it is likely that the coil thermostat inside of the choke control is toast. Not uncommon on a 30 year old vehicle. Replacement coils are inexpensive and competent parts guy should be able to source one for you.
    Or just scrap the garbage electric choke and put a manual one in...$20 and never another problem....with the choke....
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