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Old 04-13-2013, 12:53 PM   #21
follown
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I had very similar issues with my atx focus a year or so ago I thought fuel system, battery, coil packs (cause that what codes said), catalytic converter. Advanced Auto tested both battery and alt said both were fine. after a couple more days of this I pulled off the alt and took it to a local rebuild shop got it fixed for $80, problem solved. Just my experience yours maybe something else but alt was my first thought.
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Old 04-13-2013, 01:45 PM   #22
gary the wolf
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check battery connections,,,loose ground maybe
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Old 04-13-2013, 01:48 PM   #23
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Unplug your IAC and see what happens, if it smoothes out and just idles like crap.. there is our problem, You can sometimes get away with cleaning them, just use carb cleaner or something like that. brake cleaner also works. Your tps could also be bad, unplug it and see what happens.
To test the alt, start the car, and unhook the battery, if it keeps running, alt is fine. post back with results.
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Old 04-13-2013, 01:54 PM   #24
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Quote:
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Unplug your IAC and see what happens, if it smoothes out and just idles like crap.. there is our problem, You can sometimes get away with cleaning them, just use carb cleaner or something like that. brake cleaner also works. Your tps could also be bad, unplug it and see what happens.
To test the alt, start the car, and unhook the battery, if it keeps running, alt is fine. post back with results.
or idles like crap? or and? not to sure what your saying
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Old 04-13-2013, 01:59 PM   #25
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^^^ Plz don't try unhooking the battery while the engine is running, this can kill alternators that WERE fine - potentially even other electronic items.

Tx
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Old 04-13-2013, 02:53 PM   #26
Midwest07
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or idles like crap? or and? not to sure what your saying
If it smoothes out, but just idles kind of high, its your iac, sometimes a bad IAC will close and open back and forth, therefore making your idle go up and down. unhooking it will stop it from moving at all, and help verify if it is the cause of your surging idle.


I have never had a problem unhooking a battery with a running vehicle. IF you have a voltmeter, use that instead.
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Old 04-13-2013, 03:40 PM   #27
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If it smoothes out, but just idles kind of high, its your iac, sometimes a bad IAC will close and open back and forth, therefore making your idle go up and down. unhooking it will stop it from moving at all, and help verify if it is the cause of your surging idle.


I have never had a problem unhooking a battery with a running vehicle. IF you have a voltmeter, use that instead.
ok started the vehicle first time since yesterday. havnt done anything to it and it ran fine. unplugged the air intake sensor and the idle dropped a second then went back to normal level. i plugged it back in and it didnt same thing. unplugged it again and the car died.
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Old 04-13-2013, 03:47 PM   #28
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Are you unplugging the Mass Air Flow, the one in the intake between the filter and throttle body, or the Idle Air Control valve? I'm not exactly sure where it is on the focus, but have used this method on other cars.
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Old 04-13-2013, 03:50 PM   #29
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Are you unplugging the Mass Air Flow, the one in the intake between the filter and throttle body, or the Idle Air Control valve? I'm not exactly sure where it is on the focus, but have used this method on other cars.
the one between the filter and intake.
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Old 04-13-2013, 03:56 PM   #30
Midwest07
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That is your Mass Air Flow sensor.. I just searched, and your IAC valve is down by the throttle body on the intake manifold.
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