Question about 2004 Toyota Corolla

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Rough idle problem

I have been experiencing a rough idle with my 2004 corolla. I changed the air filter, cleaned my injectors and even had a diagnostics done, but the problem still exists. Can you PLEASE give me some advise.

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  • Devon Sacco
    Devon Sacco May 11, 2010

    How many miles does your car have?

    When has the spark plugs been changed out?

    What grade of gas are you using?



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Cleaning the mass airflow sensor (MAF) is what cleared up my problem. There is a video online for it which is really good.

Posted on May 27, 2013

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IACV - Idle Air Control Valve can possibly be gritty or dirt ridden and needs to be cleaned can cause a rough idle, also the EGR Valve Exhaust Gas Release Valve could be bad or dirty, those are common problems on rough idle or stalled idle.

Posted on Jul 20, 2009

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Does it do this more when its on a cold start up? if so they is a updated intake gasket. if you look at the base of the intake where it meets the head look for staining usally by cyl 1.

Posted on Apr 18, 2009

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