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1996 Toyota Carina Questions & Answers
How do u adjust the idle speed on toyota 5a engine
Modern vehicles do not have an idle adjustment. However there are a few common things that can affect this. First, if check engine light on, you must verify any codes. These can point directly (or indirectly) to drivability problems. If there are codes refer to Toyota factory procedure to read an interpret. Or have someone qualified to extract OBD2 info with scanner. If certain no codes then often times build up on IAC (Idle Air Control) motor and/or injectors can affect idle performance and be a good start. Vacuum leaks can affect idle too, but these usually set a code...but not always. However other engine controls can influence it too. A MAF (mass air flow) sensor can be dirty or faulty and occasionally set no code in PCM. Otherwise have a professional drivability specialist monitor all sensor data to make a proper diagnosis.
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