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Old 02-27-2013, 09:24 AM   #1
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Surging idle upon startup

I have a 2000 zetec with an automatic. When the motor is cold and it isn't warm weather outside I will start it and it will have a surging idle for just a couple of seconds then act completely normal. If I tap the throttle when it's surging it will also clean up it's act even sooner than if i wait it out. Usually only lasts like 5 seconds or so though. Not sure what it could be. Anyone had this problem before?


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Old 02-27-2013, 10:46 AM   #2
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Dirty IAC. Plugged fuel filter. Lots of possibilities.
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Old 02-27-2013, 02:11 PM   #3
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Well the fuel filter only has about 10k miles on it and so I wouldnt think it would be that. Dirty iac maybe but shouldn't that affect the idle in more cases than just a cold start?
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Old 02-28-2013, 12:59 AM   #4
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^yeah, unless it is momentarily stuck open and takes a few moments to un-stick itself. If it happens every time you do a cold start, unplug the IAC electrical connector and try starting it.

Else, how high do the rpm's surge? Is it dumping fuel - what does the exhaust look/smell like during the surge?
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Old 02-28-2013, 01:16 AM   #5
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When cold, the IAC is probably moving farther than it does under normal circumstances.

It's probably hitting a slightly gunked up section and it's sticking....
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Old 03-01-2013, 02:32 AM   #6
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It surges between like 250 to 900. Feels like it'll die sometimes.
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Old 03-01-2013, 02:37 AM   #7
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HERE is the how to on cleaning the IAC
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Old 03-05-2013, 10:53 PM   #8
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We shall never know now. :( dick head pulled out in front of me at an intersection in a chevy colorado. Hit it in the rear axle at about 45mph totaling my poor Focus :( But... SHE TOOK A CHEVY TRUCK WITH HER! lol And a testament to God and the Focus's crash safety. I came out of it with about 4 scratches and a bruise. GO FOCUS!
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Old 03-05-2013, 11:09 PM   #9
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Oh man so sorry to hear about that, good to hear your alright. We've had quite a few members walk away from crashes, so the focus has time and time again proved it's crash worthiness. Also glad you took a chevy out at least lol
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Old 03-06-2013, 11:15 AM   #10
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on the bright side, you no longer have a surging idle problem.



sorry about the misfortune and glad you walked away (relatively) unscratched.
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