1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

How to set idle RPM and Idle Mixture 83 RX7?

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Old Dec 17, 2011 | 11:18 AM
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smellycat's Avatar
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From: GA
How to set idle RPM and Idle Mixture 83 RX7?

I'm reading te Haynes book and it says get the car hot , idle at 2000 for 3 minutes, plug up a few vacuum lines and turn Idle Air screw to get engine at 750 rpm. then turn mixture screw till engine stumbles and turn it out a 1/2 turn or so.

Why does it not say adjust with the throttle cable? Since I tore the Carb apart to rebuild, I doubt any of my thottle cablers are exactly set were the should be. SC
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Old Dec 17, 2011 | 12:35 PM
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Idle isn't set with the throttle cable. You just need to make sure it's not set too tight, disallowing you to idle the car down.
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Old Dec 17, 2011 | 05:09 PM
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From: Loxahatchee, FL
Turn the idle screw in all the way, then back it out 1.5 turns. Start your adjusting from there backing out in small increments (start with 1/2 or 1/4 turns).

If you google search you can find the Carb. manual which details the entire procedure. PM me if you have any more questions.
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Old Dec 17, 2011 | 07:18 PM
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I think I'm getting closer.. The mixture hole is filled with epoxy I think. I thought the air screw was the mixture screw, I Pluged up a idle compensation hose and got the rpm to750 . Went for a ride. I think it helped a lot. Smooth acceleration. When I got back the idle was back at 1200,. I don't know what is up now
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Old Dec 17, 2011 | 10:14 PM
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From: Loxahatchee, FL
Originally Posted by smellycat
I think I'm getting closer.. The mixture hole is filled with epoxy I think. I thought the air screw was the mixture screw, I Pluged up a idle compensation hose and got the rpm to750 . Went for a ride. I think it helped a lot. Smooth acceleration. When I got back the idle was back at 1200,. I don't know what is up now
possibly a vacuum leak. Keep checking and you'll get it.
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