Long story short. My car idles high all the ****ing time. I cant stand it anymore. I have replaced the IAC (have 4 or 5 to swap between), even purchased a brand new one. No help. Replaced the TPS, bought a new IAT sensor and tested the ohms with my stock ford sensor. Same, so that tested good.
TPS voltage is set at .97 (.96-.99 ok i heard).
I start the car up, it will begin to idle at 1200, then slowly climb to 1500. Then after a good 30 seconds idling at 1500 it will cut out and nearly die. Then stabilize at 900. Then after a couple seconds will idle at 1200 again.
While driving I let off the gas to find the car not engine braking at all but rather speeding up slightly. So I push in the clutch and the rpm's begin to climb.
With my "dyno tune" my rpms on the freeway will hang at 4000RPM.
Recently threw codes for P1504, P0500, P0113
IAT code may be because I disconnected the IAT while it was running for a few minutes to see if it affected the idle.
If you disconnect the connector to the IAC it will drop the rpms.
The throttle body idle screw has not been adjusted!
I put it back to stock tune and it doesn't hang at 4,000 but will hang just the same.
Throttle body is stock, plenum is stock, engine is a stock 99 PI 4.6 with crower stage 2 cams. Fuel filter is new, plugs are new, wires and coil packs are new, O2 sensors are new.
Throttle body is not sticking
TPS voltage is set at .97 (.96-.99 ok i heard).
I start the car up, it will begin to idle at 1200, then slowly climb to 1500. Then after a good 30 seconds idling at 1500 it will cut out and nearly die. Then stabilize at 900. Then after a couple seconds will idle at 1200 again.
While driving I let off the gas to find the car not engine braking at all but rather speeding up slightly. So I push in the clutch and the rpm's begin to climb.
With my "dyno tune" my rpms on the freeway will hang at 4000RPM.
Recently threw codes for P1504, P0500, P0113
IAT code may be because I disconnected the IAT while it was running for a few minutes to see if it affected the idle.
If you disconnect the connector to the IAC it will drop the rpms.
The throttle body idle screw has not been adjusted!
I put it back to stock tune and it doesn't hang at 4,000 but will hang just the same.
Throttle body is stock, plenum is stock, engine is a stock 99 PI 4.6 with crower stage 2 cams. Fuel filter is new, plugs are new, wires and coil packs are new, O2 sensors are new.
Throttle body is not sticking