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Old 11-02-2013, 08:52 PM   #1
loujon
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2005 Ford Focus zx4 ST (2.0L 4 Cyl)

Engine hesitates, stumbles or misfires when accelerating - warm engine. Replaced pcv valve and hose, tps, fuel pressure regulator, new fuel pump and filter and fuel control module. Can anyone help?

VIN: 1FAFP34N65W124443


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Old 11-02-2013, 09:05 PM   #2
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any codes?
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Old 11-02-2013, 09:06 PM   #3
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Moved to General Technical Chat This section is for technical discussions relating to general maintenance, electrical issues, engine trouble, and recalls.

Hopefully you'll get better results here.
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Old 11-02-2013, 11:30 PM   #4
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It may be of no help, but the ST is a 2.3L, not a 2.0L.
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Old 11-03-2013, 12:11 AM   #5
Codyfox
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When did you last replace the spark plugs?
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Old 11-03-2013, 10:54 AM   #6
loujon
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2005 ford focus zx4 2.3l 4 cyl

Quote:
Originally Posted by Red Jay 918 View Post
any codes?
yes. code p0171 system too lean (bank 1). forgot to state in original post. looked at spark plugs checked gap and re-installed.
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Old 11-03-2013, 04:12 PM   #7
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Maybe intake manifold leak somewhere, have someone look at realtime data output of the upper O2, if stuck below .5 volt at idle then yes.
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Old 11-03-2013, 06:58 PM   #8
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upper 02 sensor replaced 5 days ago. pcv valve replaced a month ago. intake manifold had to be removed to replace pcv and hose on 2.3 duratec engine. I assumed the mechanic put a new manifold gasket in also. car runs good when cold/warm. seems to hesitates after engine has been running for a while - when hot.
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