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Old 11-28-2008, 01:13 AM   #1
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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?
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Old 11-28-2008, 07:52 AM   #2
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large vacuum leak.
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Old 11-28-2008, 07:57 AM   #3
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iac valve malfunction?
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Old 12-06-2008, 08:51 PM   #4
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Has your vacuum at idle changed? If so, it probably is a vacuum leak.
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