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Old 02-06-2014, 01:57 PM   #1
brianintc
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I Want my FOCUS back!

I made the mistake of NOT using a memory saver when swapping in a fresh battery and lost 10 YEARS of learning on the PCM. Now my idle is messed up and my gas milage SUCKS! I have taken it in to TWO really good shops and they continue to tell me that my throttle body and/or IACV are bad. replaced both and .... NO F---ing difference. At this point I want to take control of the computer settings and tune it back to something closer to what I had before. I'm more concerned about MPG (already have a Stealth CAI) than performance. What is my best approach? New parts or FSWERKS ???

Any suggestions (even those correcting my approach or thinking) are welcome!!


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Old 02-06-2014, 02:46 PM   #2
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What is it doing , why do the shops feel that you have IACV or TB issues

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Old 02-06-2014, 03:23 PM   #3
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I'm with tom it would be nice to know what exactly its doing and why they think your having TB/IACV issues. Do you already have a flash tuner? If you don't you will have to get one if you want to tune it. but tom can probably help you or at least tell you whats going on. I would still recommend getting a tuner and a custom tune from tom if thats in the budget haha. It will run much better in the end with a custom tune from tom.
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Old 02-06-2014, 06:43 PM   #4
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What mods on the car? ALL you did was replace the battery and it's now idling off/bad mileage?

Verify you have good voltage at the battery, MAF wires look good, and you didn't break any vacuum lines.
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......hmm if that works then if i put a spinner on my butt hole and rip one will i be able to run faster. ...idiots
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Old 02-06-2014, 11:23 PM   #5
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Is replacing the battery really this big of a concern?? Im planning to upgrade mine later this year o_o
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Old 02-06-2014, 11:45 PM   #6
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not 10years
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Old 02-07-2014, 07:49 AM   #7
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Is replacing the battery really this big of a concern?? Im planning to upgrade mine later this year o_o
Not, not at all. The battery needs to be unhooked for at least 20min in order for the KAM to reset. If you hook up the new battery and your gauges don't sweep at key on, you've lost nothing.

If you want to reset idle, let the car fast idle for 5min or so after a good drive and it will be back to normal.

The OP has some other issue going on with the idle and bad gas mileage.
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Old 02-07-2014, 09:33 AM   #8
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Actually the KAM can set in less then 5 min it just depends on a lot of things

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Old 02-07-2014, 10:35 AM   #9
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the base idle is up and does not want to "settle" once you put it in gear or press the gas then let off. also at start up (cold) it takes FOREVER for the idle to drop. it was never a problem before the battery replacement.
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Old 02-07-2014, 10:36 AM   #10
brianintc
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they think the TB cuz ... and I quote "even a slight problem with the TB will cause problems". I don't think it's a valid diagnosis.
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