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Hot weather gremlin
Posted by dtech (more from dtech) on Mon, 14 Jul 2008 05:27:09
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Hi I have a 1999 I-4 that about 10% of the time experiences uneven engine perfromance - if at idle roughness and small surging, at more open throttle one can feel the slight loss of power. TB has been cleaned, no codes. It only happens when engine is completey warm and outside temps over 90.
Last summer it was severe with stalling and TB codes - but I eventuall found the cause to be a small leak from the charge air temp sensor. After sealing that leak the car ran perfectly from last summer till last week.
I suspect a small vacuum leak and last summer replaced all of the thin vacuum lines, but it only occurs intermittedly - about 10% of the time, so it's a bugger to troubleshoot.
Any thoughts where to look ?
Car has 120K miles,
thanks
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