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89 Tracker Over-revving on start up
#6
all Excessive vacuum leaks cause excess idle speed,
and is normal cold, 1500 par.
once hot the IAC closes 100% leaving only hot air paths.
if there is vacuum leak the ISC is closed to ready 800RPM hot idle. if the leak is huge
the ISC can not close more and may even hunt the ISC and idle hunts.
all vacuum leaks most be removed, mostly hoses bad. or even fell off?
or brake vacuum booster can crack and will suck huge air.
I pinch hose, or remove them and plug them to prove that path does not leak air.(vacuum leaks)

even the idles speeds set wrong by others, fiddling that TB idle stop screen wrong.
or gunk under the TB TV throttle valve plate or all cables to the TB not set with spec slack.
http://www.fixkick.com
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89 Tracker Over-revving on start up - by WizBang - 12-06-2018, 07:40 AM
RE: 89 Tracker Over-revving on start up - by fixkick - 12-10-2018, 11:22 PM

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