Question about 1998 Jeep Wrangler

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Motor hesitation only when it is cold once engine is warmed up engine runs smooth. Motor hitches terrible until tempature comes up too normal operating temperature. Once engine is warm it runs perfect, engine is a 6 cylinder 4.0

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It might be your ECT sensor (engine coolant temperature sensor). Usally you can mesure the resistance and the voltage of the ECT sensor. You need a chart which says the Resistance versus the Temperature versus Voltage. EXEMPLE : at 120celsius, voltage should 0,27volts and the resistance should be 1,18Kohms ...etc. (this is only an exemple)

Posted on Jun 23, 2009

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