For most models, you'll only need a 13mm and 15mm socket and a screwdriver.

1. Remove the MAF sensor. This is the large black square held by 3 screws into the Throttle body. Some are phillips, some are torx, some are a combination of slotted and one of the other. You'll know when you see it. (differs by year). Don't forget to disconnect the electrical connector. Wink

2. You'll need a Q-tip and rubbing alcohol (not the kind you drink) to clean the MAF sensor filaments. These are very delicate, so GENTLY clean the filaments of any carbon buildup or dust, then set the MAF sensor aside in a safe place where your dog or kids can't get to it.

Now let's remove the TB:

3. This may differ by year, but you'll get the differences (if any) as you go (I've done the Series 1 L67 and L27 personally on several occasions). You'll find two small screws with hex heads on the front end of the black throttle bracket. Remove these. After the two small screws are removed, remove the two clips holding the throttle cables to the TB. A small screwdriver will release them. Set them aside in a safe place. Now using a small pair of pliers, release the throttle and cruise cable retainers from the throttle bracket itself.

4. Look carefully at the throttle bracket. You'll find that it's attached to the throttle body AND the rear head. The heatshield for the crossover pipe should be removed first in this situation. Remove the nut on the head stud, remove the bolt on the back end of the heatshield, then remove the heatshield entirely, and the stud as well to release the back portion of the heatshield (L27's are a mess, you'll need a universal for this procedure for the farthest forward attaching point).

5. At this point, the only thing holding the TB is the TPS (throttle position sensor) and IAC (Idle air controller) connectors, and three bolts. Disconnect the TPS and IAC. Remove all 3 bolts (studs with nuts attached), then pull the throttle body off the intake or supercharger, whichever you're lucky enough to have.

Cleaning:

6. Leave the TPS attached to the TB, but remove the IAC. The IAC is the one that's roundish in shape, not attached to the bottom of the trottle shaft.

7. Clean the IAC shaft, nose, and spring with carb or intake safe cleaner, or Castrol Super-Clean (Available at NAPA in the purple gallon or spray bottle). After cleaning, lubricate with oil of any type, and let it sit for a bit.

8. Remove the MAF screen by gently releasing the retaining ring with a small tool. Open the throttle, and gently push the DELICATE screen out of the TB. Clean with anything but peanut butter.

9. Spray the living snot out of the TB with carb cleaner, intake cleaner, or soak in castrol super clean. Even gasoline does a good job. The back side of the throttle plate and the IAC passage (the area the IAC nose seats against) should be meticulously cleaned. A good toothbrush will help.

Recovery:

10. Whatever solvent/cleaner you used should be THOROUGHLY evaporated or dried before reassembly, particularly anything in the small hole where the MAF sensor sits. Some solvents can damage the sensor.

11. Reassemble everything in the reverse order, and use a new gasket for the TB. Most auto parts stores have the gasket for you, but the 92/93 L67 owners need to get their gasket from the dealer in advance of this fantastically fun project.

For reference, Torque specs for reassembly are listed in the Specification section here, and the throttle cable goes on top, and cruise on the bottom. Wink


Author : Willwren