Mechanics

ROUGH RUNNING

2005 Ford Expedition • 140,000 miles

2005 expedition blew two codes for cop's. Replaced and replaced plugs, no codes now however, it still has hiccup while idle and at coast at highway speed. Repaced VCT's both sides still running rough, not while accelerating just at slight pedal pressure.
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Erikfial
October 13, 2012.




What were the codes retrieved? Are the codes still there?

KHLow2008
Oct 13, 2012.
0300, 0355, 0358 I beleive if I remember correctly. Anyway I reviewed to cylinder 5 and 8 coil fault.
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Tiny
Erikfial
Oct 14, 2012.
The codes should be interlinked and now that the coils were replaced they have been rectified. The hesitation and rough idling could be due to low idling speed.

Try cleaning the throttle body and IAC and retest.
Are the spark plugs of the recommended specifications?

KHLow2008
Oct 14, 2012.

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