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Old 07-03-2013, 01:39 AM   #1
gun7369
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dead idle when running hot

My 2003 Focus ZX3 is dying at idle when things get hot. Thermostat and Water Pump and everything else is tip top. No overheating issues, but why does the car die at idle? What could cause this? Is it the PCV valve? The car runs like a champ but when it is 90+ F and you drive around town it dies at idle at stoplights,etc.


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Old 07-03-2013, 03:13 PM   #2
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You will get a better response here.
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Old 07-04-2013, 12:48 AM   #3
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warm stall is a common failure mode on old Focii, and the common culprit is a collapsed PCV hose or a dirty/faulty IAC valve. Type those terms into the forum search box and you'll find more info than you care to see.
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Old 07-04-2013, 06:22 AM   #4
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TPS can do it also, just found that recently on mine.
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Old 07-04-2013, 09:30 AM   #5
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I would go after the IAC first. I just worked through this on my Zetec as well. Remove the IAC, fill the inside of the valve area with tune-up cleaner, let soak for 5 min, dump it and blow out with compressed air, reinstall. This is a common part of a good tune-up on any non electronic throttle controlled vehicle.

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Old 07-04-2013, 10:52 AM   #6
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Quote:
Originally Posted by amc49 View Post
TPS can do it also, just found that recently on mine.
+1

Check engines codes, a TPS error will have a code for bad TPS... Otherwise I would bet IAC... Autozone will check your codes for free.
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Old 07-04-2013, 10:54 AM   #7
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Many late IACs have a rubber diaphragm in them, you want no solvents in there..........on the older ones with no rubber, yeah, you could clean those.
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