2004 Toyota Corolla high idling until the engine is warm, p

2004 TOYOTA COROLLA
78,000 MILES • 4 CYL • 2WD • AUTOMATIC
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JSRAYNES
  • MEMBER
  • 1 POST
the engine idles up sometimes to 3000-4000 rpms during warm up. no dummie lights come on at all. the fuel mileage has dropped off considerably. what could be causing this? also the car sometimes doesn't start right away.
Jan 8, 2010 at 11:02 PM
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MMPRINCE4000
  • ✓Experienced Mechanic
  • 8,548 POSTS
A vacuum leak or a malfunctioning IAC (idle air control valve).
If equipped with a "fly by wire" throttle system (no direct cable connection to throttle body), then that system may be problem.
Jan 8, 2010 at 11:26 PM
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