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I found a complete diagnostic and repair section on your carburetor at Go to the "vehicle repair guides" section and you'll find it with a little bit of looking. I printed it out and it was 28 pages. I've been looking for the same info for several years. Good luck!

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โˆ™ 2005-02-06 03:44:03
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Q: Where is the adjustment needle on a 1988 Toyota Corolla carburetor?
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Sounds like a bad float or needle and seat assembly. Time for a rebuild.

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if you are sure your car has a carbuerator and not fuel injection like all newer cars,the needle would be attached to the topside of the float in the bottom of the carb, its purpose is to slow or speed up fuel flow into the carb. hope i helped, but i think that year of car may be fuel injected, if you have any questions

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Could be,Foreign material (dirt, rust, etc) caught in the needle and seat,Bad float,Float is out of adjustment,

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Could be that the fuel filter is clogged and not allowing sufficient fuel to pass to the carburetor; you might also check the carburetor adjustment needle(s) to see if they may have rattled toward the closed postion.

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When fuel cannot enter a carbureator like yours I would think it is because the float and /or needle valve is stuck. In other words the carburetor thinks it is full of fuel so it is shutting off any more incoming fuel. The filter on that model should only be inline not in the carb. I would remove the carb and take the top off of it. Take a can of GUMOUT and clean the needle /seat assembly good and make sure the float is working properly.

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either there is dirt in bowl or needle and seat is worn

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