When I start a Ford Explorer 4.0 SOHC from a cold start, it will rough idle for 5-7 minutes and I must keep my foot on the pedal. Once it's warmed up, it will idle smoothly. What could cause this?

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When I start a Ford Explorer 4.0 SOHC from a cold start, it will rough idle for 5-7 minutes and I must keep my foot on the pedal. Once it’s warmed up, it will idle smoothly. What could cause this?

Counterman Staff
By Counterman Staff
Published:

Anything from an ECT (engine coolant temperature sensor), a faulty IAC
(idle air control valve), intake manifold or post MAF (mass airflow) sensor
to old, worn-gap spark plugs can cause poor running when cold. Check the
plugs and retrieve any DTC (diagnostic trouble codes) for a more clear
picture of the problem.

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