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My toyota l touring has unstable engine idle speed

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Clean the throttle body and idle air control valve with reg carb cleaner ,do not spray the mass air flow sensor. Clean with a rag soaked in the cleaner, have someone hold the throttle down from inside car spray until clean. put back all disconnected hoses and hold throttle to floor when starting. Then quickly release and give 2 half revs and release. allow engine to idle. It should now idle smoothly. If not check for cacume hose leaks an replace any that feel spongy or soft or have splits in them.

Posted on Apr 18, 2013

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Posted on Jan 02, 2017

  • 1348 Answers

SOURCE: unstable engine at idle and high soeed

do a compression test to make sure the cylinders are in balance.
if the compression is good,change the plugs wires cap and rotor.
also air filter,fuel filter and clean the throttle body inlet with a cleaner.add an additive in the full tank of gas to clean the injectors.

Posted on May 22, 2009

  • 154 Answers

SOURCE: unstable idle on my 1991 Toyota Cressida. Stalls

EGR WILL NOT HELP.. IDLE AIR CONTROL. POSSIBLE

Posted on May 31, 2010

  • 71 Answers

SOURCE: hi, i having problems with the idle speed on my

you should have the codes pulled if the check engine light is on. if its not on it sounds like a idle control valve

Posted on Apr 26, 2010

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I have a 2006 Toyota 140i manual transmission. Whilst waiting at the stoplight with the engine at idle ,the revs suddenly race up to 4000rpm & come down on its own. What could be the problem .


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