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Have a 2001 ford focus zx3 2.0l dohc idles rough, high idle misfires.

Have a 2001 ford focus zx3 2.0l dohc idles rough, high idle misfires.

Was told it could be the spark plugs needed replacing, so i went ahead and did a tune up. Changed all filters, spark plugs and cables, ignition coil pack and changed the oil about 2 weeks ago. But a couple of days before i did the tune up the serpentine belt snapped(it snapped while driving)so I replaced it and idler pulley. Then did the tune up. Still misfires and idles rough and high idle. Still no check engine light. What could it be?

Asked by: Guest | Views: 182
Total answers/comments: 1
bert [Entry]

"Check for vacuum leaks. Brake booster and pcv system.

Also I would check the serpentine belt tensioner and alternator. Start eliminating the simple stuff first before throwing part darts. VACUUM LEAK"