Idle/Mixture
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Senior User
Joined: Mar 2003
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From: Cloverdale, BC, Canada
Idle/Mixture
I have a simple question. What should I set my Idle and Mixtures to? And how di I know when I've got them there (ex: How many turns of the screw...1/2...). Thanks.
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Joined: Dec 2001
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From: UT
The vehicle repair guides at www.autozone.com (electronic version of Chiltons DIY) have a procedure in the tune-up section.
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From: peoria, az
Not familiar with this motor. What does it have for a carb? Don't know if you have 1 screw or 2 but, it don't matter. Here's an easy way to do it and it will even pass emissions if required. Start by turning the screw(s) in completley then back out 2 1/2 turns. Start engine and let it stabilize. Make sure RPM is close to spec. Make sure timing is correct... O.K...now turn screw(s) in 1/8 turn at a time, allowing about 30 sec's for idle to stabilize after each turn. You will reach a point where the idle will drop and even get a little rough. Stop at this point. Now turn the screw(s) back out 1/4 turn and leave them there. If you notice any problem like backfiring on decel after this, turn them out 1 more eighth turn.
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Senior User
Joined: Mar 2003
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From: Cloverdale, BC, Canada
I have a Model 2150 2-V Carburetor. It has two mixture adjusting screws on the front near the bottom. The one is hard to get at but I think I can manage. Thanks for all the help.
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From: Michigan
though I could be wrong about the mixture. See I took off the 2150 and put on a 1978 2100 from a 302. That was fuuuuun
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From: Lisbon Falls USA
Help with idle
I have that same 85 Bronco II and the same carb. Does anyone have a procedure to set the idle. The carb has an idle speed control on it. I just changed the throttle position sensor and the idle will not return to normal after letting off the gas. It does after a period of time. Anyone know how to set the idle on this unit?? I know there has to be a procedure to get the idle speed control motor in the correct position to control.
