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Why my engine cannot idel

Tiny
RATO
  • MEMBER
  • 1991 TOYOTA PASEO
  • 215,000 MILES
Toyota paeso 1991 auto 1500 5E - FHE. Engine cannot idel at 700-900 rev, only rev up and down all the time hot or cold between 1700-2400 air skrew turned all the way in (ie toyota mechanic)still car goes well but uses plenty petrol. Too many vacuum pipes.
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Monday, July 9th, 2012 AT 8:17 AM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check for vacuum leak, clean out the idle air control valve and EGR/PCV valves-MAF sensors w/electronic cleaner and see what happens-let me know
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Monday, July 9th, 2012 AT 10:37 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
If the IAC coolant hoses are both different in temperature, you have a clogged valve or within the hoses and that has to be repaired to resolve. The cold start valve would not be able to close fully at operating temperature.

With throttle fully closed, note if there is a gap with the throttle plate. I have seen throttle plates worn at the sides and you would have to replace the throttle body if that is the case.
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Monday, July 9th, 2012 AT 2:34 PM

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