Where's the idle screw on a 2002 Cadillac Deville

https://www.autocodes.com/p0410_cadillac.html

Throttle Position Sensor Replacement
Remove the idle air control (IAC) electrical connector (1) from the IAC sensor (4).
Remove the manifold absolute pressure (MAP) sensor electrical connector from the MAP sensor.
Remove the water pump belt cover.
Remove the TP sensor retaining screws electrical connector (2) from the TP sensor (3).
Remove the TP sensor electrical connector (2) from the TP sensor (3).
May have video on youtube showing how to

This answer covers 1999-2005 Cadillac Deville, Eldorado & Seville.
Example Engine:
2002 Cadillac Seville STS 4.6L SFI DOHC HO 8cyl.

This engine has (2) Crankshaft Position (CKP) Sensors: the Upper sensor is CKP sensor B, and the lower sensor is CKP sensor A (this is included for the OBD-II DTC codes - P0385 references Sensor B = upper CKP sensor, whereas P0335 references the lower CKP sensor (sensor A)).

Both crankshaft position sensors are located in the front of the engine just above the oil filter adapter. To access both CKP sensors, jack up vehicle on the passenger side, remove the oil filter, and the oil filter adapter, including the Engine Oil Pressure (EOP) switch. See illustration.

The ARROW points toward Front of Car.
1. Upper Crankshaft Position Sensor (B).
2. Lower Crankshaft Position Sensor (A)
3. Engine Oil Pressure (EOP) switch
4. Engine Oil Level switch
The Oil Filter is the can-type object below the oil filter adapter, which includes the EOP switch. Recommend: remove oil filter with an oil filter socket/strap wrench, since it's close to the oil pan.

check connectors must be fully seated and each wires between crankshaft sensor and Power Control Module...

on the 4.9 liter v8 the idle speed control motor is is located in front of the throttle body it has two miniature pulley's on the side of it where the throttle cables are, there is a screw located on the idle speed control motor which can be adjusted but i would not sugggest it they are known to go out and they do affect the idle when they are malfunctioning its fairly simple to change and the its called the idle speed motor made by duralast they are seventy two dollars at auto zone the pic. of part i explained

the idle screw on the 4.9 liter is in front of the throttle body under the air intake cover. it sound like you may need to replace your idle air control valve it is located in the same area

Click over pic for zoom...



Fig. Showing the location of MAP Sensor and other components on the front of the engine: 1. Manifold Absolute Pressure (MAP) Sensor; 2. Idle Air Control (IAC) Valve; 3. Engine Coolant Temperature (ECT) Sensor; 4. Throttle Position (TP) Sensor



Fig. Engine coolant temperature sensor (1).

they all are wrong .i was a service tech for Cadillac for 15 year and guarantee you that the problem is in you're crank shaft sensor .Cadillac redesign the sensor on 2002.check for code you'll find p0355 and p0385 .replace the sensor and reprogram the new ones.good luck Danny.B

I had the same problem with my 2001 Cadillac Deville, like you I had replaced literally everything thermostat, water pump, radiator, temperature sensor, reservoir and cap, hoses etc....I didnt have any leakage. I was told I had air in my coolant system. After a lot of research and running across the right mechanic I was able to locate the bleeder and remove the air from my lines. No problem since. The bleeder is located on yhe left side of the radiator on the crossover, mines was sideways..Hope this helps someone before they spend money for new head gasket problems..Try this it helped me....