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post #1 of 4 (permalink) Old 05-02-09, 12:20 AM Thread Starter
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confused Help! My Focus Has Gone Crazy!!

I have a 2003 Focus. Everything was great. I replaced the battery. Everything was great. For awhile. Then, one day, I went to start the car and it did start, but was rough, with rough idle. I began driving when all the lights on my instrument panel started going off and on, and my car suddenly died. I coasted, shifted into neutral and was able to re-start it, but the rough idle, very choppy engine response and the "dummie" lights continued to act "crazy!" WHAT in the world is going on here??? Please, please help!!

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post #2 of 4 (permalink) Old 05-02-09, 02:36 PM
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Re: Help! My Focus Has Gone Crazy!!

Might be worthwhile getting alternator output tested. If that is o.k ,diagnostic check would be advisable .
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post #3 of 4 (permalink) Old 05-02-09, 08:47 PM
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Re: Help! My Focus Has Gone Crazy!!

i would definitely get it checked out. anytime your lights are going on and off like crazy, something is up.
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post #4 of 4 (permalink) Old 05-03-09, 05:58 PM
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Re: Help! My Focus Has Gone Crazy!!

Rough idle can be associated with a bad IAC sensor (idle air controller), located around the throttle body. Replacing the TPS is also advisable while you're in that area, as it's also a regular maintenance item. If you have over 100,000miles I wouldn't rule out a bad alternator. It'd be a good idea to get it tested if the problem still persists after replacing the sensors.

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