If somebody could provide me with a diagram of the Idle Air Control System or the proper DTC code that corresponds with P0505 or maybe has had this problem before could provide me with some assistance.
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Have you check to see if you have a vaccum leak on the engine.....the P0505 may also be a Vaccum leak, Diry Throttle Body, the IAC being defective or Poor Electrical connection to the IAC Valve. Try checking for leaks and cleaning the Throttle Body before doing the expensive stuff.
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Current Topic - the P0505 code is for the 1996 protege