high idle

i have a 2001 saturn sc1 service lights codes show #1 eng misfire and also
iac system higher than expecter rpm i change the plug and wire and
also cleaned out the throttle body what do i do next the engine as
soon as it starts rpm is about 1200

 

Hi, might want to give the starting conditions too, outside temp, was
the engine warm or cold, etc... etc...


later,


tom @ www.CarFleaMarket.com

 

the outside temp was about 60 and no matter if the car is warm or cold it
still starts out with high rpm,s and runs high throughout the duration
about 4 months ago i had the misfire code i changed all the plugs and
wires it fixed the problem and then about a month ago both codes showed
up. the car has 75000 miles. i was wondering are they somehow tied
together

 

the rpms are 2100 at idle i replaced pcv valve coolant temp sensor. plus
the IAC still no help i clear the codes but still coming back after about
10 min of driving

 

Coolant temperature sensor? If engine thinks it is cold, idle kicks up and
mixture is richened up. Bet your plugs are black from the rich condition.

 

Not sure of the year or model, but on some there are two different coolant
temperature sensors. One goes to the gauge and the other to the computer.
The one that you need to check is the latter. You indicate you changed the
CTS, but was it the correct one?

Sorry if this does not apply to your year or model, but from your
description it does sound like the CTS.

Bob