Originally Posted by I8AHUMR
It's not serviceable. If the location of the valve is changed the computer gets confused b/c it loses track of where it was. It won't match what the computer has in memory
You are correct in stating that "it is not serviceable". In Chrysler's terms, that means it is replaced as an assembly, rather than any indivdual components.
The throtle body can be cleaned and it is not difficult, but a degree of care is necessary. I did it as the first thing after warranty expired. 90grandoneer
put me on to this crud buildup
. Frankly, I was astounded as to how much oily crud had built up in 30K miles
. We have posted this description on several other threads on JF since about Jan '10.
Here's what I did:
1. Remove the big box (air intake silencer) from the front of the engine. Comes off with 1 @ 10mm capscrew and a sliding clip underneath. Loosen all hose clamps and rubber transition pieces. Also, disconnect the intake air temperature sensor underneath. Have to slide the assembly towards the front of the Jeep to disengage.
2. Remove the 4 @ 10mm capscrews holding the throttle body to the intake manifold. When disengaging the throttle body assembly, take care not to damage to the big O-ring between the throttle body & the intake manifold. I did not disconnect the wiring harness (afraid it would somehow lose its memory.) Others have since told me that it can be disconnected, provided, the negative lead to the battery is removed first. The OEM Service Manual (Section 14) that I now have confirms this.
3. I cut a new wooden paint stirrer down to about 4-5" in length. Carefully open the butterfly and insert the paint stirrer in the bore, perpendicular to the open butterfly. This allows you to work on it easily.
4. I used a clean, old cotton t-shirt, isopropyl alcohol, and q-tips to carefully remove the crud buildup on the throttle body bore. Particular attention is needed around the butterfly shaft penetration into the throttle body and where the closed butterfly lands on the bore. Clean the back side and the edges of the butterfly. These are machine surfaces, so be sure that you do not scratch them.
5. I also wiped out the intake manifold in the area where the throttle body bolts up and where the PCV valve discharge into the intake manifold.
6. In re-assembling, remember the O-ring and hand-tighten the 4 capscrews. Torque is 5.6 N-m (50 in-lbs) and they are done in a criss-cross pattern. Object is to avoid distorting the throttle body upon re-installation.
7. Replace the air intake silencer cross box and connect the hoses and intake air temperature sensor. Might want to ensure the intake air temp sensor is clean also.
Take your time. This is about a 1-hr job. Hope this helps.