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Old 01-11-2013, 03:43 PM   #32
Focus Jr. Enthusiast
Join Date: Jan 2009
Fan#: 61807
Location: USA, United States
What I Drive: 2002, Silver Frost, ZTS

Posts: 37
FF Reputation: 1 Top-Ace Good Standing Member
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I am having the EXACT same problem with my Zetec ZTS. I have replaced plugs, wires, coil pack, fuel filter, air filter, pcv valve and hose, oxygen sensor, DPFE sensor, EGR solenoid, probably more I cant remember. I have a Snap-On Solus scanner and do not see any problems. Fuel trim is at a rock solid plus or minus 2, so no vacuum leak.

It is also stumbling when very cold at start up. Also less power going up hills.

I am getting around 24-25 maximum MPG all long distance highway, much worse in city. Honsetly at this point, I think the timing is slightly off. Maybe the exaust side cam timing is off a few degrees, which i know can cause these symptoms.
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