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Check to see if your third break light is working, usually cruise control and third break light are on the same circuit. Bad gas mileage could be numerous. Does it smell like raw gas out the exhaust? Could be O2 sensor going bad.
most bad cat converters do not affect idle as there is little gas flow problem at that speed
different at speed or full throttle
try using a scan tool to reset the ECM after all of the new parts
the sensors (O2 ) are not the faulty units as listed by the code p 2198 which are the heated oxygen sensors in the exhaust manifolds before the cat converters -- fault stuck rich
AS these senors (HO2S) report the gas composition to the ECM to adjust air /fuel ratio it is very possible that these being faulty , the ecm is allowing extra fuel into the engine and in effect running on choke
Using the throttle to idle suggests that the problem is air /fuel mixture for and idling engine and I would be investigating that area as the problem
Yes, a defective IAC valve can cause an incorrect idle issue. The other reasons or possibilities are: kinked or damaged throttle linkage, improperly adjusted idle screw, defective, loose, or improperly adjusted TPS sensor, vacuum leak, leaking base gasket (carb.), or the timing is off (maybe the distributor has been adjusted or is loose). I hope these suggestions help. Please let me know how your repair goes of if you have other questions, good luck.
The computer controls idle through the idle control valve or motor. Sometimes deposits build up around it or in the air passages it controls. If it is taken off and cleaned, it might help. Use a good quality sensor safe cleaner. Check if the passages are clear. Or if the throttle position sensor is going bad, it could cause those problems. The sensor can be tested with a multi-meter. Have you checked for any trouble codes?
Vacumn leaks will cause a high idle as described..but if its the canister line it will only leak when canister purge solenoid is activated . and will likely not affect idle..When you changed the tps did you set it with a scan tool ?? the tps voltage at closed throttle must be set at .47 volts or a whole bunch of wacky things with the Idle can occur...
po102--maf sensor, could be a bad air cleaner and not letting air into engine, po122--tps pedal position sensor low, replace or adjust tps sensor,or wiring,po507--idle control system high input. for this you can take off idle air control, and clean out carbon from were it mounts on engine. it is just before throttle body at end of air intake hose, it is black. do not push on pintle on end of valve when cleaning, use a old toothbrush to clean carbon off of valve, use carb cleaner but do not soak valve in liquid of any kind. good luck!!
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