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Old 05-16-2014, 09:41 PM   #1
disturbinglee
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Bad tune??

Not really sure if this belongs on this thread but i think it does. I might not be the most mechanically inclined person but i can tell theres something wrong with my car. When it idles the revs go up and down, sometimes only a little, sometimes a bit more till i rev it a bit and it calms down. also if you're letting it idle after a while it almost stalls it self but it realizes and gives a bit more gas. My assumption is that this is from a bad tune by the previous owner because not only do i have this issue but i only get 15 miles to the gallon. Basically I have 2 main questions.
1. Is this most likely the problem or is it something else I'm unaware of?
2. If so would it hurt the car to just reflash it to stock? not sure if that could cause any problems since I don't know about the previous tune.

Thanks for your help guys, really appreciate it. This form is awesome



Last edited by disturbinglee; 05-16-2014 at 11:07 PM. Reason: wrong word
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Old 05-16-2014, 10:24 PM   #2
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Moved to "Focus Tuning Chat".
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Old 05-16-2014, 11:13 PM   #3
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I would flash it back to stock and see if the problem goes away then you will know if it is tune related or a engine issue

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Old 05-17-2014, 11:50 AM   #4
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Thanks Tom, that's what I'll do
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Old 05-20-2014, 05:54 PM   #5
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Update ?

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Old 05-20-2014, 06:33 PM   #6
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Sorry, I haven't been able to get it tuned and I don't have the money for a sct tuner at the moment. I'll update this when I do though
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Old 05-21-2014, 08:07 PM   #7
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didn't get to a tune but i changed the plugs and used some fuel system cleaner but it didn't fix the main problem. Brought my mileage up a little bit though
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Old 05-21-2014, 08:55 PM   #8
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When I said to go back to stock tune I thought you had the flasher when you got the car

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Old 05-22-2014, 02:42 AM   #9
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Sadly no, I dont know much at all about what's been done.
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Old 06-08-2014, 10:42 PM   #10
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Hey tom, sorry its been so long since I've posted back but I think its the IAC valve from the research I've done. I'll post back after once I've cleaned it out. I've heard throttle body cleaner is best to use but do you know what else i could use? either its the IAC or a vacuum line somewhere i think. it does sound like I've got a bad vacuum line somewhere
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