Quote:
Originally Posted by JMB36TA
I’m trying to get the fuel and air adjusted on my Q-jet. Judging by the burning eye sensation I’m getting a lean mixture.
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Burning-eye exhaust is typically from misfire. Could be lean misfire, could be bad ignition, could be anything that causes misfire.
Quote:
Originally Posted by steve25
You really don't need a vacuum gauge as you want to set the idle mixture screws for the fastest rpm you can get ( as in lean ) with auto Trans as when you drop it in gear it will go just a tad rich.
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I run the engine until it's fully warm. Chock the wheels, engage park brake, put it in gear, and then adjust for highest vacuum. I find a vacuum gauge to be more sensitive than a tachometer.
Quote:
Originally Posted by gtofreek
You may need to put a small hole in the front butterflies in order to get the butterflies closed enough to not pull fuel from the transition slot.
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I have a Q-jet with holes in the primaries, apparently done by Rochester. That said, I'd drill holes in the casting to route some idle air around the throttle blades, rather than drilling the blades themselves if possible. Many Q-jets are drill-able for idle air bypass.
Quote:
Originally Posted by 455GRIN
Turn the idle down low, and try the mixture screws again
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Yup.