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Older Generations (1969-1987) Specific discussion of the AE86, along with generations 1 through 5.

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Old 10-31-2008, 09:19 PM   #1 (permalink)
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High idle

I installed these intakes but no matter what I do the idle is to high, has anyone used the little intake before, that's the one that I have on now and the rmps are up to 1200 to 1500 with the lights on. My car is a 88 corolla but its carburated most 88s' are not carburated so that's why I ask you guys. I already set the idle screw all the way out and the car still stays on. PLEASE HELP!!!


This is the one I currently have




This is the one I had(trying something new)


Last edited by Rolla88; 10-31-2008 at 09:22 PM.
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Old 11-01-2008, 01:47 AM   #2 (permalink)
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1200 to 1500 rpm would be the fast idle speed or idle with the AC running. Run the engine warm and floor the throttle a few times. If the idle doesn't drop to about 800 or isn't adjustable then the fast idle cam doesn't disengage. If the fast idle cam doesn't disengage yiu can screw around with the idle mixture screw as mich as you want - nothing's gonna happen...
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Old 11-01-2008, 02:26 AM   #3 (permalink)
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What he said!

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Old 11-01-2008, 07:02 AM   #4 (permalink)
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Quote:
Originally Posted by itburnz View Post
1200 to 1500 rpm would be the fast idle speed or idle with the AC running. Run the engine warm and floor the throttle a few times. If the idle doesn't drop to about 800 or isn't adjustable then the fast idle cam doesn't disengage. If the fast idle cam doesn't disengage yiu can screw around with the idle mixture screw as mich as you want - nothing's gonna happen...
When I floor the the throttle it goes to 1000 or 800 but once I gas it again to go the revs go up again. I did mess around with the idle screw (its the long one that comes from behind the carb right?) and its all the way out its not even touching the throttle anymore. Why would the high idle cam not disengage? When I turn on the car the idle is at 2000 but when I step lightly on the gas it goes down to 1000 or 800 but as it warms up it goes up to 1200...its just to weird
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Old 11-01-2008, 09:04 AM   #5 (permalink)
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Originally Posted by Rolla88 View Post
When I floor the the throttle it goes to 1000 or 800 but once I gas it again to go the revs go up again. I did mess around with the idle screw (its the long one that comes from behind the carb right?) and its all the way out its not even touching the throttle anymore. Why would the high idle cam not disengage? When I turn on the car the idle is at 2000 but when I step lightly on the gas it goes down to 1000 or 800 but as it warms up it goes up to 1200...its just to weird
Have you check the choke coil to make sure it is working?

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Old 11-01-2008, 10:14 AM   #6 (permalink)
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Have you check the choke coil to make sure it is working?

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What and where is the choke coil, I don't know if I said it but the carburetor is new not even a year old, by the way how do you keep the carburetor from rusting cause it looked all nice when I installed it but now some parts are rusting
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Old 11-01-2008, 10:59 AM   #7 (permalink)
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The choke coil is that Black thing on the left side of the carb, should have an electrical connection to it. If it is not a factory carb, chances are that the carb is not set up properly to your vehicle. You may want to get a cop of the FSM, and adjust it to the spec of your vehicle.

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Old 11-01-2008, 11:15 AM   #8 (permalink)
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Well I had to retard my timing a tad and loosen my throttle cable like I read in website but I don't know if that's the proper way to fix the problem. Are carburetated cars suppose to have high rpms. In my carb the choke coil would be on the right correct, like the pic up top? If so what how do I adjust it?
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Old 11-01-2008, 11:18 AM   #9 (permalink)
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Left side of the carb, and right side of that picture. The emission sticker under the hood may give info on the settings of the choke, otherwise you do need a FSM to get that info according to application.

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Old 11-01-2008, 11:40 AM   #10 (permalink)
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I have the repair manual I guess I can check it there, the jackass who sold me the car put an aftermarket hood on it so it doesn't have the specifications, but I'll check the manual, I need to fix this cause it annoying the hell out of me, and thanks for all the help
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Old 11-01-2008, 01:40 PM   #11 (permalink)
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Have you had a look at the fast idle cam after the car warmed up and you revved it? It should be underneath the choke coil and lock the throttle in a high rpm position when the car's cold. If it disengages I'd say it works in the way it's supposed to. That the rpms first drop and then climb again seems odd. Check the linkages to make sure nothing binds. Could it be that the accelerator cable that gets stuck somehow? Maybe you would want to check the vacuum lines again, too, if you haven't done that already.

BTW: Where did you get the small air-filter unit? I think I want one; would make working on the carb a lot easier.
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Old 11-01-2008, 06:02 PM   #12 (permalink)
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Quote:
Originally Posted by itburnz View Post
Have you had a look at the fast idle cam after the car warmed up and you revved it? It should be underneath the choke coil and lock the throttle in a high rpm position when the car's cold. If it disengages I'd say it works in the way it's supposed to. That the rpms first drop and then climb again seems odd. Check the linkages to make sure nothing binds. Could it be that the accelerator cable that gets stuck somehow? Maybe you would want to check the vacuum lines again, too, if you haven't done that already.

BTW: Where did you get the small air-filter unit? I think I want one; would make working on the carb a lot easier.
Both Auto Zone and Advance cell that filter its like $12 for everything and I think like $6 for the filter. Let say that my fast idle cam binds, its a new carb so I don't know why it would, but lets say it does, how would I notice and if it is how would I fix it and prevent from doing it again? I've checked all the vacuums, some people have said that I should do something with the hose right next to the PCV, I checked the throttle cable it was a bit tight pulling on the throttle so I loosened it and it help a bit but it still idles high. Some have told me that some how the carburetor is sucking air from another place, that's why I took such a close picture so people could have a closer look and help me out , but yeah you can find that filter in those auto parts, and thanks for the help
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Old 11-01-2008, 08:59 PM   #13 (permalink)
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I think my problem could be my ECT switch
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Old 11-02-2008, 09:38 AM   #14 (permalink)
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Well I put on the stock airbox and I noticed that the fast idle cam a little to close to the throttle don't know what to do about that the carb is new don't know why its doing that, the rpms stay between 700 and 800 but when I rev it goes to 1000 but when I high rev it goes down to 700, I think it my be the throttle cable. Quick question when you turn on the lights what causes the revs to go higher, cause whatever it is turns the revs from 800 to 1200.
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Old 11-02-2008, 12:56 PM   #15 (permalink)
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Well I came to the conclusion that the throttle cable sticks so I have to get a new one. I still don't know why the idle rises so much when I turn on the lights but what the hell, will my idle problem mess my motor up cause I'm running out of ideas, but you guys have been a great help thanks
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