2001 Focus Rough Idle

2001 ALL OTHER MAKES ALL OTHER MODELS
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POLY100
  • MEMBER
  • 1 POST
Wife's Focus just started to idle rough. Installed new plugs and air filter, no help. The car runs out perfect, just idles rough and gas mileage has gone down. Would appreciate any ideas. Thanks :(
Feb 10, 2006 at 1:56 AM
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GEARSHIFTER
  • MEMBER
  • 20 POSTS
ckeck the gas filter or the timming is off.
Feb 10, 2006 at 4:21 AM
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GODBEAR839
  • ✓Experienced Mechanic
  • 77 POSTS
are all the wires good? do a resistance test with a multimeter or just replace them alot of times they go bad when the plugs do. also might want to pick up a can of fuel injector cleaner just to be sure it's not a fuel delivery problem as well.
Feb 10, 2006 at 8:44 AM
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Suggested Repair

Test spark plug wire resistance with a multimeter or replace the wires, since they often fail when the plugs are replaced. Also use fuel injector cleaner to rule out a fuel delivery problem.

Conversation Summary

A 2001 Focus began idling roughly and getting worse gas mileage, though it otherwise runs fine. New spark plugs and an air filter did not help. One reply suggested checking the fuel filter or ignition timing. The expert recommended testing or replacing the spark plug wires and using fuel injector cleaner to check for a fuel delivery issue.

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