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Old 02-24-2013, 02:27 PM   #1
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Help, rpm issue 2001 mustang

When the heat or AC is on. The rpm will jump from 700-1000 every 10 seconds or so. I took a video but don't know how to upload. any ideas what is causing the rpm jump? Or a fix
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Old 02-24-2013, 02:36 PM   #2
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I wonder if it could be an IAC problem? A lot of idle problems on our cars are caused by dirty or worn out IAC valves. Weird that it is only when that ac or heat is on though.
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Old 02-24-2013, 02:40 PM   #3
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I have cleaned it multiple times, I may have to replace it. I want to make sure before I start spending cash. Would a bad compressor cause this?
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Old 02-24-2013, 02:47 PM   #4
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It could for the ac, but you're saying it happens while the heat is on too, so more then likely it isn't the compressor. Past that I'm not really sure. Maybe a few more people will be able to help.
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Old 02-24-2013, 04:32 PM   #5
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It is your AC compressor cycling on and off. When you run your your heat the compressor will cycle on and off my 2000 v6 and my 04 v6 both do it but the 04 is barely noticeable compared to the 2000. If you pop your hood and turn on your defroster you can watch you AC compressor pulley engage and disengage when the Rpms jump
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Old 02-24-2013, 04:39 PM   #6
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My girlfriend has a 98 v6 and it don't do it at all. No rpm jump. Maybe a vacuum leak will cause this?
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Old 02-24-2013, 04:41 PM   #7
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Idk I've only seen it on new edge mustangs but working at a shop I've seen other cars do this as well
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Old 02-24-2013, 04:45 PM   #8
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I will just try to ignore it. I have 2 flowmaster super 44's. so it makes a god awful drone sound. Ha

---------- Post added at 05:45 PM ---------- Previous post was at 05:42 PM ----------

Also just thought of this it may be low on freon
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Old 02-24-2013, 04:46 PM   #9
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Yea they do. My 2000 did that. What year is yours? Seems the its a lot worse on the 99-00 than that 01-04
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Old 02-24-2013, 04:54 PM   #10
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Mine is a 2001, I neer thought about low freon, although I may have a leak in the system although it blows a tad bit of cold air out
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Old 02-24-2013, 05:21 PM   #11
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you could always buy a UV test kit...see if you can hunt down the leak that way
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Old 02-24-2013, 06:16 PM   #12
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My 95 jumps down a little when I turn the A/C on. I haven't noticed it with the heater though.
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