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Old 04-13-2013, 03:59 PM   #31
Midwest07
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it would not hurt to clean the MAF, do not use brake cleaner or carb cleaner on it. Use dedicated MAF cleaner, most parts stores carry it, and DO NOT touch the sensor itself.

I would also clean the IAC, you CAN use brake or carb cleaner on that, it is just a valve that moves back and forth to regulate flow or air to get the right idle rpm.
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Old 04-13-2013, 04:01 PM   #32
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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.
ok lemme go try that
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Old 04-13-2013, 04:04 PM   #33
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You have an 2.0 SPI right? here is an image showing where it is..
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Old 04-13-2013, 04:08 PM   #34
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Ok unplugged it idle raised slightly but ran smooth
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Old 04-13-2013, 04:13 PM   #35
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When you plug it back in, does it go back to its surging?
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Old 04-13-2013, 04:14 PM   #36
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When you plug it back in, does it go back to its surging?
well when i started it up this morning it was running fine. lol
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Old 04-13-2013, 04:19 PM   #37
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Oh fun, one of those "it happens sometimes" problems.. Let it idle and warm up completely, maybe take it for a short drive, park and then let it idle, try to replicate the same situation over again, repeat unplugging the IAC once or if it starts to surge again.
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Old 04-13-2013, 04:20 PM   #38
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ok my wife slash ex wife and girlfriend are here and both have a theory. they both say fuel pump because the first time this happened was after a long day of driving around in the heat. then again yesterday after a long drive in the sun it happened again....i dont know if they know whats up or not. what do you think
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Old 04-13-2013, 04:28 PM   #39
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Oh fun, one of those "it happens sometimes" problems.. Let it idle and warm up completely, maybe take it for a short drive, park and then let it idle, try to replicate the same situation over again, repeat unplugging the IAC once or if it starts to surge again.
does this focus have one or two fuel pumps?
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Old 04-13-2013, 04:29 PM   #40
Midwest07
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ok my wife slash ex wife and girlfriend are here and both have a theory. they both say fuel pump because the first time this happened was after a long day of driving around in the heat. then again yesterday after a long drive in the sun it happened again....i dont know if they know whats up or not. what do you think
I don't know. Does this happen with a really low tank of gas? The pump is cooled by the gasoline in the tank, when the tank is low, MAYBE if the pump is going out, the slight bump in heat is causing a problem, but its doubtful.

Your intake temp sensor could be going out of range/bad, driving around in heat, and then idling would cause a spike in underhood temps and some heat soak. Along with the coolant temp sensor, it works along with the other sensors to help balance idle. (cold coolant = higher idle/richer mixture untill warm up)

I would highly suggest getting the codes read. Advance auto does it for free, and most shops will do it for minimal charge. This would really help in knowing whats really going on.
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