Question about 2002 Toyota 4Runner

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My friend has a 4runner and all of a sudden the engine started idling real bad. i checked it and scanner shows that cylinders 2,4,6 are misfiring. any suggestions. thanks in advance.

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Since all of the EVEN Cylinders are misfiring I suggest checking the timing belt as it has likely slipped on that bank of the engine.

Posted on Apr 14, 2015

  • c douglas
    c douglas Apr 15, 2015

    her 4runner still moves. shes doesn't drive it though.would this be possible if the timing belt actually slipped off?

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Try cleaning inside the throttle body with throttle body cleaner or carb cleaner, between the throttle body assemble and the throttle body plate there is a slight opening to let the air come into the engine, even at idle, clean the build up, your vehicle being a 2002 model, there will be some carbon build up there, also clean the Mass Air Flow Sensor with Mass Air Flow Sensor Cleaner, if equipped, some vehicles have it, and some don't have it, test the fuel pressure with the fuel pressure tester, then refer to the repair manual to check your readings.

Check the ignition system, starting with the spark plugs and the ignition coils, swap the coils to see if the result changes or not, if it is a boot on coil type, for the coil pack type not possible, due to having a specific pattern / layout for the ignition firing order.

Jumped timing chain or belt can be a cause.

If your ignition wires are quite old replace them, same goes for spark plugs, then change the Positive Crankcase Ventilation Valve, ( PCV VALVE ), change the fuel filter, air filter, ignition cap and rotor, as well, while at it, and most tune up parts are not that pricey

Its helps to look in the repair manual for the test procedures, and or trouble symptoms.

Hope this helps.

Posted on Apr 15, 2015

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1 Answer

How to repair a number two misfire


ok you have P0302 DTC errors. why not POST ALL ERRORS?

P0302

means that cylinder was weak, (NOTHING MORE)

caused by 4 things.

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