Removed air intake hose to clean throttle body and noticed oil inside. Why???????????

I have checked all hoses to see if there is a loss of a vacuum but they all seem fine.
I have put in a new air filter and oil filter and the problem still persists.
I checked all electrical connections - cleaning them of any debris and also cleaned up my ground connections but again nothing has changed.

Today I took out the throttle body in an effort to clean any potential deposits.
The throttle body looked relatively clean however the part on top of the throttle body (is this called the intake manifold?) had a fair bit of oil in it - which had bled down into the sensor located on the front of the throttle body. It also seems that this oily deposit is going into the intake boot and down the air intake hose from the air filter.
After having attempted to clean all of this up I reassembled everything as was and unfortunately it now seems even worse.
There is a hose coming off the right hand side of the intake boot that goes to the engine and this seems to have a big build up of oil and nasty deposits in too.

When disassembling the throttle body (and what I have assumed to be the intake manifold) it struck me that there didn't seem to be any gaskets on the components- just one from the air boot. Not much to do about it, it is an infinite problem

I suggest you google 05 ford focus throttle positioning sensor. This sensor keeps you air intake throttle at the proper position when the engine is cold and changes position when the engine has warmed up. to locate the sensor, remove the hose that comes from the air filter housing to the engine. the hose you removed was connected to the air throttle. you can manipulate the position of this throttle by having someone push the gas pedal down slowly while you watch the throttle move. notice that the gas pedal cable is connected to the mechanism that opens and closes the air throttloe. also notice that beside this mechanism, you have an electric throttle positioning sensor. Pay close attention to the existing throttle positioning sensor before you remove it if you are planning on replacing this sensor. because if you do not install the new sensor in the same degree that the old one was in, you will throw the calibration off. word of advice. buy some throttle cleaner from your local auto parts. turn the car on with the air filter to throttle body hose off and have someone push the gas pedal down slightly to keep the engine from turning off. spray the throttle body cleaner til all the black crud comes off the inside of the throttle body. this dirty crud is what was making your throttle stick and not working properly.

Yes clean the throttle body with throttle body spray cleaner and an old tooth brush with a terry cloth. Take air intake hose off of the throttle body assembly open the throttle body, spray cleaner all around on the inside, use an old tooth brush to scrub the grime and wipe clean with a terry cloth. Repeat until cloth shows clean.

That sounds like an air leak in the intake manifold area. If there is no hose off,it could be a intake manifold gasket problem

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Idle Air Control Valve Pintle may be bad If you disconnect the IAC and the problem ceases it can point to this being the problem.: Removal & Installation 3.5L Engine To Remove:

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Remove the fuel injector sight shield.
3. Drain the cooling system.
4. Remove or disconnect the following:
   • The air cleaner intake duct. Figure of IAC and TPS electrical connectors disconnected.
     
     
   • The idle air control (IAC) valve and throttle position (TP) sensor electrical connectors. Figure of cruise control and throttle control cables removed from throttle lever.
     
     
   • The cruise control cable and throttle control cable from the throttle body lever.
   • The fuel pressure regulator vacuum hose, positive crankcase ventilation (PCV) hose and the throttle body vacuum port hose.
   • The throttle body coolant hoses.
   • The throttle control cable bracket, leaving the throttle and cruise cables connected.
   • The upper nut holding the throttle body to the intake manifold.
   • The throttle body assembly.
5. Clean the gasket mating surfaces.

To Install:

1. Install a new gasket and new studs if necessary.
2. Install or connect the following:
   • The throttle body assembly.
   • Start the top nut by hand.
   • The throttle body coolant hoses.
   • Position the throttle control cable bracket and hand start the retaining nuts and bolt.
   • Torque the three throttle body retaining nuts to 89 in.lbs. (10 Nm). And the bracket retaining bolt to 115 in.lbs. (13 Nm).
   • The throttle body vacuum port hose, PCV valve hose and the fuel pressure regulator hose.
   • The throttle control and cruise control cables to the throttle body lever.
   • The IAC valve and TP sensor electrical connectors.
   • The air intake duct.
3. Refill the cooling system.
4. Install the fuel injector sight shield.

4.0L Engine To Remove:

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Relieve the fuel system pressure.
3. Remove or disconnect the following:
   • Negative battery cable.
   • The Mass Air Flow (MAF) sensor electrical connector.
   • The air cleaner intake duct.
   • The PCV valve fresh air tube. Figure of cruise control cable removed from throttle cable bracket.
     
     
   • The cruise control cable and throttle control cable from the bracket.
   • The cruise control cable and throttle control cable from throttle body lever. Figure of IAC valve and TPS connectors removed.
     
     
   • The idle air control (IAC) valve and throttle position (TP) sensor electrical connectors. Figure of fuel lines removed from retainer on throttle cable bracket.
     
     
   • The fuel feed and return lines from the retainer on the throttle control cable bracket.
   • The transaxle shift cable clip from the throttle control cable bracket. Figure of throttle body removed from water crossover.
     
     
   • The throttle body from the water crossover.

To Install:
NOTE: The Mass Air Flow (MAF) sensor inlet and the outlet of the air cleaner assembly must line up when installed. Misalignment may cause MIL illumination or driveability concerns.

1. Install or connect the following.
   • The throttle body to the water crossover. Torque the bolts to 106 in.lbs. (12 Nm).
   • The IAC valve and TP sensor electrical connectors.
   • The throttle and cruise control cables to the throttle body lever.
   • The throttle and cruise control cables to the throttle control cable bracket. The transaxle shift cable clip to the throttle control cable bracket.
   • The fuel feed and return line retainer to the throttle control cable bracket.
   • The MAF sensor electrical connector.
   • The air cleaner intake duct clamp. Torque the clamp to 27 in.lbs. (3Nm).
   • The PCV valve fresh air tube.
   • The fuel injector sight shield. Torque the nuts to 20 in.lbs. (2.3 Nm).
2. Install the negative battery cable.
3. Pressurize the fuel system and verify no leaks.

Try cleaning the throttle body, Remove the intake hose that connects to the intake and air filter box. You will need a can of throttle body cleaner $6. and clean rag. Spray the cleaner in the throttle body and you will see black carbon build up running out of the throttle body. clean the butterfly, which is what opens/closes when the throttle is open or closed inside the throttle body. repeat 2-3 times and wipe it dry and clean with the cloth, be sure not to leave any material inside the throttle body. re-connect what you removed. It will be hard to start for a second, don't worry it's the cleaner. After start up let it run for a minute and test drive. Cheap fix on alot of vehicles.

your throttle body flap is sticking, just remove air intake hose hold throttle open and clean inside with carb cleaner and toothbrush, this should fix, if not throttle body will have to be replaced. and its pricey

hi has this a turbo if so would say air leak,check hoses

It could be burning and you don't notice. Remove air filter box assembly from top of intake manifold. Hold throttle wide open (engine off) and look through throttle body (flashlight may be required) and see if oil is puddled up inside manifold. If so then the intake manifold will need to be removed so the lower pan gasket can be replaced.