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    Sam 1's Avatar
    Sam 1 Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Jul 21, 2007, 04:04 PM
    High rpm's
    I have a 98 ford ranger and have had a problem with rpm. I have a 2.5 litter 5 speed engine with a/c.
    When the outside tempature rises above 60 degrees I lose control of my rpm's. Rpm's will shoot way up and not come down to normal until I stop rolling. I have changed my idle speed control valve and checked for vacuum leeks but have not found the problem.
    Does anyone have any ideas?
    Sam
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
    Uber Member
    		  
    #2

    Jul 21, 2007, 04:58 PM
    . Check for codes--AutoZone will do it for free.
    . Clean/replace Mass Airflow (MAF) sensor. A defective MAF sensor can cause surging, stalling, rough idle and other driveability problems. Air passing over the hot wire causes it to cool--the sensor converts this temperature change into an analog voltage signal to the PCM. The PCM, in turn, calculates the required fuel injector pulse width to obtain the proper air/fuel ratio.
    . Ensure you are not using an oil-impregnated air filter.
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