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post #1 of 2 (permalink) Old 06-12-09, 04:52 PM Thread Starter
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Question Need help with my my 2005 focus zx3

i have a 2005 focus zx3 it has 57,000 miiles on it, last time i went to see wat the problem was and it was pcv hose and my mass air flow sensor. i got those replaced and now my car is acting worse then before.......
when i turn it on it idles very high and when it starts to calm down it idles really fast up and down from the 1 to the 2! also sometimes when i come to a complete stop my car starts idling really crazy and will die, so i put it in N and it starts right back up and it starts doing the same thing! also if i turn my a/c off my car will just die when i stop. im also getting really bad gas mileage!
also the check engine light says bank 1 system too lean and i have checked for vaccum leaks and there were none, and have changed my pvc hose and mass air flow sensor!!!
if you have any ideas of what can be wrong with my car, please let me know! i would really like to fix this problem!
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post #2 of 2 (permalink) Old 06-14-09, 08:50 AM
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Re: Need help with my my 2005 focus zx3

One sensor can sometimes affect another. I'd replace the IAC & TPS sensors. They're easy to do on your own. I'd get the vehicle scanned first to make sure there aren't any engine codes stored. The lean problem might be due to a faulty oxygen sensor. The oxygen sensors keep the air to fuel ratio at the proper 14.7:1 for best performance. Just a caution here, replace both sensors, not just one. Why you ask? Because the new sensor will generally cause the downstream to go bad and give false readings. It might not happen right away, but give it a few months.

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