Question about 1998 Ford Expedition

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I have a 98 Ford Expedition,The valves clatter when you accelerate in drive,ive put octane booster in gas,still clatters. is it possible that the egr valve is not opening correctly?if so ill check and the actuating solinoid,and tpfe sensor.

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Yes i agree this is a egr problem can you put vacuum to the egr valve while it is running to see if the idle drops if it does then the valve itself is good .Then check the dpfe evr solenoids :)

Posted on Sep 30, 2009

  • mike loshbough
    mike loshbough Oct 09, 2009

    What is with the not helpful .You asked a question and i said yes this COULD CAUSE THIS IF THE EGR VALVE IS NOT OPENING >NOW go and spend alot of money to have it fixed because you cant!

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My guess would be the valves might need adjusting if it tapping fairly loud. Its common to high mileage vehicle and don't recommend driving the car too long with the noise. low oil pressure can also cause valves to tap due to lack of oil lubrication. you can hear the diffrences between the valves tapping VS engine knocking from low octane. take to any shop any good mechanics can tell you right of the bat which one it is and wont cause you a penny. hope that help some

Posted on Sep 30, 2009

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