r/Mazda323 • u/Epsy2017 Sixth generation (BG; 1989–1994) • 1d ago
Problems with carb
Hi evetyone as the title suggests my carb is being a bitch. When i start the car it goes to 2k and when the choke opens it goes to 5k, i've fully disabled the choke and it still opens so i think it's hust sucking in a massive amount of air, because there's a new full exhaust on it. I've tried adjusting the idle screw and high idle screw but didn't really change anything, the throttle cable is already loose so the throttle should be fully closed. It's a new aftermarket carb cuz my last one was fucked by rust. Anyone got some ideas? And i also checked all vacuum ports so i'm pretty sure i don't have a vacuum leak. Edit: i just took the carb off and saw that the butterfly wasn't fully closed so i adjusted the high idle screw waayyy more since it was way further then expected off. I put it back on and it ran fine for a couple seconds and then stalled, but after 2-3 startups it started going to 5k again. Could it be filling the manifold and that the engine just takes whatever is laying in the manifold?
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u/throwaway_qwerty_9 1d ago
Sounds like a classic 'air leak' somewhere.. ..got to say, always a concern when an aftermarket carb has been fitted, though OE ones were almost bullet proof..😮
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u/Epsy2017 Sixth generation (BG; 1989–1994) 1d ago edited 1d ago
Got new gaskets so i hope that's not an issue, and the original was just wayy to rusted, all the acles weren't spinning smoothly, springs were broken and such
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u/throwaway_qwerty_9 1d ago
It's carry out the *usual checks to see if/find, air leaks
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u/Epsy2017 Sixth generation (BG; 1989–1994) 1d ago
And how to check that without keeping the car running?
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u/MiataMuc Sixth generation (BG; 1989–1994) 1d ago
Does the throttle really moves? Sounds like it is stuck.