civic revs on its own at idle ?
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Joined: Oct 2009
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civic revs on its own at idle ?
I have a 97 civic ex that is overheating, idle with full oil and coolant.
Today I noticed something new: when I turned the AC off, the RPM started repeatedly climbing and falling as if I was pumping the accelerator. Approximately +500, -1000, +500, repeated in one second intervals, so pretty significant in size and frequency, obviously not normal. Turning the AC button back on stops the fluctuating RPM altogether. I've seen plenty of "revving while idle" posts where turning the AC on caused the problem but never the opposite as I'm experiencing.
Anyone have any idea what might cause this?
Thanks in advance.
Today I noticed something new: when I turned the AC off, the RPM started repeatedly climbing and falling as if I was pumping the accelerator. Approximately +500, -1000, +500, repeated in one second intervals, so pretty significant in size and frequency, obviously not normal. Turning the AC button back on stops the fluctuating RPM altogether. I've seen plenty of "revving while idle" posts where turning the AC on caused the problem but never the opposite as I'm experiencing.
Anyone have any idea what might cause this?
Thanks in advance.
Last edited by menocu; Oct 11, 2009 at 09:14 AM.
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Joined: May 2008
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From: Boston, MA
