low rough idle

2002 FORD TAURUS
200,000 MILES
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ACEWINGMAN89
  • MEMBER
  • 1 POST
On my 2002 Ford Taurus, when in idle, it runs lower than normal rpms and it is extremely rough. Once it hits 20-40 MPH, it starts running better, but still rough. Took it to Auto Zone and had the code ran and it came back with P0352 - Ignition Signal Coil B Fault. I have changed the Ignition Pack, Spark Plugs and Wires, but it still is doing the same thing. I have a new Crank Shaft Sensor that I am going to replace on it later. Any help would be much helpful. I have been working on trying to get the car running correctly for around 6 hours so far and am stumped. Thanks!
Dec 8, 2011 at 6:47 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
It could be a wiring problem. Make sure the wiring to the coil is in good condition and not corroded or damaged. Also, the crank sensor sends a signal VIA the computer, to the coil. It may have a weak signal.

Before I go further, the most common cause of a rough idle is a vacuum leak or a bad idle air control valve. In your case, check for vacuum leaks. If the idle is not changing up and down, the IAC is most likely fine.
Dec 8, 2011 at 6:50 PM
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