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Old 01-21-2013, 03:22 AM   #8
Focus Jr. Enthusiast
Join Date: Dec 2012
Fan#: 107116
Location: Des Moines, IA
What I Drive: 2000 SE Zetec with ATX

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I have replaced the upstream O2 sensor due to a possible non-reported, lean running issue (a suggestion by my father and old gear-head). I have to admit that as mad a bit of difference in running smoother. I also swapped out the fuel pump driver module due to a TSB from a different post in the forums. Car runs better than it has with everything I have dumped into her so far. Now it refuses to die now once I get it running, but can be hard to start without some persuasion from the gas peddle. Seems to be worse once the engine is at running temp. On a side note, since I replaced the driver's side upper transmission mount the entire car no longer shakes (a condition of 156k miles), but instead she purrs like a kitten as long as she is not struggling to stay running. After test driving her, the engine no longer surges and dies at stop lights or stop signs but does sporadically surges when is in park or neutral.

Last edited by Z3T3C; 01-21-2013 at 04:58 AM.
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