1991 Toyota Cressida idle

Tiny
KBKTULSA
  • MEMBER
  • 1991 TOYOTA CRESSIDA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
When I put my car into park the motor revs fron 700 to 1800 rpm back and forth, it will not level out
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Sunday, August 3rd, 2008 AT 7:45 PM

3 Replies

Tiny
RASMATAZ
  • MEMBER
Too fast an idle speed. If an engine without computerized idle speed control is idling too fast and refuses to come down to a normal idle speed despite your best efforts to back off the carburetor idle speed screw or air bypass adjustment screw (fuel injection), air is getting past the throttle somewhere. Common leak paths include the carburetor and throttle body gaskets, carburetor insulator spacers, intake manifold gaskets, and of course, any of the engine's vacuum fittings, hoses and accessories. It is even possible that leaky O-rings around the fuel injectors are allowing air to leak past the seals. Another overlooked item can be a worn throttle shaft and a defective idle speed speed control motor/valve stuck in the extended (high idle speed) position/throttle position sensor. Also the throttle plate could be binding in its bore and kinked accelerator cable, coolant temperature sensor might not be operating properly misleading the computer that the engine is still cold and computer throwing fuel at it raising the idle speed
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Sunday, August 3rd, 2008 AT 8:00 PM
Tiny
KBKTULSA
  • MEMBER
It goes up and down, if you put the car inpark and just set there it revs up and down from 7 or 800 to 15 to 1800 rpm, if will not set one speed thank you it is fuel injected
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Sunday, August 3rd, 2008 AT 8:27 PM
Tiny
RASMATAZ
  • MEMBER
Check the idle air control valve, throttle position and mass airflow sensor to include the fuel pressure
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Monday, August 4th, 2008 AT 2:43 AM

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