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Re: 91 mazda 323 wont rev out past 2500~3000rpm or idle
Hi your problem may be that there is some debri in the main jet in carb that will not let sufficient fuel thro for further accelleration also if this is the cause then carb cleaner will not clear it you will have to physically clear it ? another possiblity ? is the fuel pump/or lines may not be delivering the fuel on demand for more revs ? ie pump / or filter clogged ?
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Sounds like you have a vacum leak. Trace the vacum lines under the hood to locate broken or uninstalled vacum line.You can always spray a little brake cleaner in suspect area ,and if the idle goes up, you are close to the problem. Even a intake gasket leak will cause high idle
I have seen many of these die out due to a broken or cracked vacum hose. Look under the hood and listen for a whistling or hi vacum noise. You can also take carb cleaner and spray around vacum hose and pcv valve and intake. If the motor revs up or stalls out when you do this then you definitl have a vacum leak. Find and replace.
If I am wrong about the vacum hose I woulds inspect idle air control motor, throttle position sensor, (both canbe cleaned as a temporary fix) or worst case may be a fuel pump.
if its carby engine has the idle solenoid stopped working or lost power very common
single wire soleniod can be checked for power with test light
no power=off/no idle
or has some one adjusted carby settings?