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Random misfire at idle. 2003 Toyota Corolla?

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Old 21 Apr 2011, 01:09 pm   #1 (permalink)
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Default Random misfire at idle. 2003 Toyota Corolla?
My Corolla has a random misfire at idle (about 700 rpm) Runs fine above around 900 rpm.































Scan tool said the car is running lean.































Anything I could check myself to see whats going on?
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Old 21 Apr 2011, 01:24 pm   #2 (permalink)
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Needs fuel injector cleaner.
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Old 21 Apr 2011, 01:39 pm   #3 (permalink)
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What's the code?
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Old 21 Apr 2011, 01:54 pm   #4 (permalink)
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you probably have an intake gasket leak. engine vacuum is at maximum @ idle, so more air is entering the engine than what the mass sensor is reading through the intake leak. the ecm controls the injectors on how much fuel goes into the combustion chambers based on what the mass sensor reads. if more air leaks into the chamber then the a/f ratio will start running lean....causing the misfiring.
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Old 21 Apr 2011, 02:09 pm   #5 (permalink)
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install new sparks and if it doesn't help get the injectors looked at.
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