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?
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perfectmistake78 did it do all of this before the serpentine belt snapped? Have you had a chance to scan the OBD for any codes yet?
door oldturkey03
Yeah. I thought that would fix the prob, say ended up having to change the serpentine belt again and replace the idler pulley due to loud screeching. Got rid of the noise but still misfires and idles rough. There was some vibrating and shaking because the passenger side motor mount wasn't tight enough I fixed that. So there's still a slight vibration but I'm not sure if that's due to the rough idling
door perfectmistake78