|Originally posted by Gall757:|
The two issues may be connected. There will be a bit of re-learn time for the computer after working on the high idle problem.
While first part is likely very true... Second isn't if you drive the car.
These old ECMs are very dumb and forgets most things every time keys is off. For that matter Forgets most things in a few seconds to a minute or two when the engine is on and running. ECM needs standby power mainly to save DTC(s) set by whatever errors cause by iffy/bad sensors etc.
Is why ECM needs driving > 35mph to reset IAC every time you run the engine.
NORMALLY IAC will be close to same setting to get cold engine to work right but ECM has nothing to make sure IAC is true until that reset cycle.
New IAC or just take out old IAC to clean the port then ECM is more confused until the reset cycle.
You need a ECM scan tool to read sensors etc. because iffy wiring and plugs may make sensor value read way wrong, ECM sees low/high volts regardless of volts You see elsewhere, and more.
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