Question about 1990 Toyota Corolla
If it is low then you can usually put dye in the system to find a leak. go to local parts store, ask for a/c leak detector dye, read instructions on bottle. after you run it for a few days then check it under a black light. usually a hose.
Posted on Apr 30, 2010
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Posted on Jan 02, 2017
when u say u checked for leaks did u use a uv light and the yllow glasses cause thats the only way to see leaks i would check all connections including service ports under the red n blue caps (high n lowside ) also if ur system went to low u might have to evactuated first for it to work also when u take it in to evactuate the system they should tell u if its holding pressure
Posted on Jun 13, 2008
Tips for a great answer:
MAF: A Mass Air Flow (MAF) sensor output that causes the PCM to sense a lower than normal air flow will cause a lean condition.
Air Induction System: Air leaks into the induction system which bypass the MAF sensor will cause a lean condition. Check for disconnected or damaged vacuum hoses, incorrectly installed or faulty crankcase ventilation valve, or for vacuum leaks at the throttle body, EGR valve, and intake manifold mounting surfaces.
Fuel Pressure: Perform a fuel system pressure test. A faulty fuel pump, plugged filter, or faulty fuel system pressure regulator will contribute to a lean condition.
Injector(s): Perform injector coil/balance test to locate faulty injector(s) contributing to a lean or flooding condition. In addition to the above test, check the condition of the injector O rings.
EGR: Check for leaking valve, adapter, or feed pipes which will contribute to a lean condition or excessive EGR flow.
Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.
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