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Constant Revving at ~2000rpm...

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Old Nov 28, 2008 | 01:13 AM
  #1  
momo182's Avatar
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Default Constant Revving at ~2000rpm...

Hey guys my 90 miata 1.6L is constantly revving at around 2k rpms when in neutral even when fully warmed up. A while ago I got an engine light for 3 codes: a) coolant thermistor(if i remember correctly)
b) oxygen sensor reading too high
c) oxygen sensor reading stays the same

I actually haven't seen these codes in a long time so can't remember exactly what they were, but that is the general idea.
So does anyone have any clue on what's up with those rev's?
Old Nov 28, 2008 | 07:52 AM
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large vacuum leak.
Old Nov 28, 2008 | 07:57 AM
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iac valve malfunction?
Old Dec 6, 2008 | 08:51 PM
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Has your vacuum at idle changed? If so, it probably is a vacuum leak.
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