Ford Focus Forum, Ford Focus ST Forum - View Single Post - crappy fuel mileage
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Old 01-11-2013, 05:12 PM   #34
PWGuy
Focus Enthusiast
 
Join Date: Nov 2011
Fan#: 91777
Location: Belvidere, IL
What I Drive: 2003 Pitch Black ZTS Sedan

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Quote:
Originally Posted by Top-Ace View Post
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.
So changing the timing belt will fix this or is more required to fix, if it's an exhaust side cam timing issue?
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