Rick's Free Auto Repair Advice

Rough idle – Ford

Why do I have a Rough idle – Ford

Ford has issued a service bulletin to address a rough idle problem on 2009 Ford Escape and Mercury Mariner vehicles with the 2.5L engine and six-speed automatic transmission built before 3/5/09.

The rough idle appears when first started after an extended soak. The bulletin says that the rough idle usually happens with the transmission in Drive and the engine loaded (like when AC is on).

As is more common these days, the problem is due to faulty software. Before you spend lots of time trying to diagnose the problem, get the latest software update. The only way around the problem is to reprogram the PCM with the latest software. Any dealer or qualified independent repair shop can reflash the computer. However, this is not a recall, so you’ll have to pay for it. Generally, a reflash costs about $150

©, 2014 Rick Muscoplat

Posted on by Rick Muscoplat


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