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Jeep Wrangler YJ
YJ General Discussion
Possible carb vacuum leak
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<blockquote data-quote="Sahara90" data-source="post: 426336" data-attributes="member: 18878"><p>Cameron</p><p>You may have a vacuum leak at the brake booster. You can remove the hose to the brake booster and plug It temporary. If you drive with the hose disconnected you will have little or no brakes. You said the engine will run with the idle speed screw turned in all the way. With the idle screw turned all the way in, the mixture screw will have little or no effect on how the engine runs. This is because with the idle turned up high, the carb is no longer running on the idle circuit. </p><p></p><p>You could also have a leak at the base of the carburetor wher it connects to the manifold. Check the carb mounting nuts. Are they tight? Once you find your problem, set the mixture screw back to the recommended turns out. Then set the idle screw so the rpms are about 700. Then go back and set the mixture for the smoothest idle. Good luck</p></blockquote><p></p>
[QUOTE="Sahara90, post: 426336, member: 18878"] Cameron You may have a vacuum leak at the brake booster. You can remove the hose to the brake booster and plug It temporary. If you drive with the hose disconnected you will have little or no brakes. You said the engine will run with the idle speed screw turned in all the way. With the idle screw turned all the way in, the mixture screw will have little or no effect on how the engine runs. This is because with the idle turned up high, the carb is no longer running on the idle circuit. You could also have a leak at the base of the carburetor wher it connects to the manifold. Check the carb mounting nuts. Are they tight? Once you find your problem, set the mixture screw back to the recommended turns out. Then set the idle screw so the rpms are about 700. Then go back and set the mixture for the smoothest idle. Good luck [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Possible carb vacuum leak
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