Question about 2003 Ford Focus
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Posted on Jan 02, 2017
SOURCE: Engine surge during warm up.
Try changing your PCV valve make sure the hose is clean and not full of oil. Also check the elbow end that goes to the intake they tend to collapse from oil saturation. Hope this helps.
Posted on Sep 29, 2009
Higher compression usually only happens when extra oil is introduced in to the cylinder.Your rings seem good due to the good compression .If there is a worn valve guide in that cylinder this would allow oil to seep into the cylinder .Also allowing for extra rocker arm movement which could be your chirping noise and cause a rough idle.The lean code sounds like something different like the is still a vacuum leak.It sounds like you know cars well ! I hope this helps
Posted on Nov 10, 2009
if it's a 5.4 litre engine then i would advise u to check the hose that goes to p.c.v. valve to intake manifold. on back side of intake manifold there is a rubber elbow connector that deteriorates. get one from dealer cost is roughly 20-40 bucks. that deteriorated rubber elbow causes a vacuum leak.
Posted on Jan 15, 2011
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