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

    Dec 14, 2008, 05:23 PM
    2002 6.0l GMC Idle
    My 6.0l GMC won't idle when cold. No check engine light. Any Suggesttions?
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
    Uber Member
    		  
    #2

    Dec 14, 2008, 05:32 PM

    . Replace platinum spark plugs (ACDelco only), with the exact plug that came in the vehicle, if the plugs have over 40,000 miles on them.

    . Clean the Idle Air Control Valve (IACV), throttle plate, throttle body and ports:

    https://www.askmehelpdesk.com/cars-t...ml#post1054149

    . Replace air filter.

    . Check/replace Engine Coolant Temperature (ECT) Sensor, which affects fuel injector pulse width. The ECT Sensor is a temperature dependent resistor (thermistor), whose resistance decreases as the engine coolant temperature increases. It provides a richer mixture when cold, leaner mixture when hot.

    . Check all vacuum hoses.

    . Replace PCV Valve.

    . Clean MAF Sensor:

    https://www.askmehelpdesk.com/cars-t...ml#post1377134

    . Adjust throttle cable, if necessary, to set idle rpm to specs.
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