Throttle Body

Remove and replace the throttle body assembly on the 2008 Dodge Viper 8.4L V10, including disconnecting air intake components and electrical connections.

Warnings

Tools required

Parts

• Throttle body gasket × 1 — Use OEM specification
• Throttle body assembly (if replacing) × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Allow engine to cool completely (minimum 2 hours after operation)
3. Open hood and secure in raised position
4. Disconnect negative battery cable and wait 2 minutes for system discharge

Procedure

1. 1

   Remove engine cover
   Grasp the engine cover at the front corners and pull upward firmly to disengage the rubber grommets from the mounting posts. The cover is held by friction fit grommets only and does not use fasteners. Set the cover aside in a clean area.
2. 2

   Disconnect air intake tube
   Locate the air intake tube connecting the air filter housing to the throttle body. Loosen the hose clamp at the throttle body inlet using a flathead screwdriver by turning the screw counterclockwise several turns. Pull the intake tube off the throttle body inlet and move it aside to provide access.
   Torque spec

   Air Intake Hose Clamps3 Nm (2 lb-ft)
3. 3

   Disconnect throttle body electrical connector
   Locate the throttle position sensor electrical connector on the driver's side of the throttle body. Press the release tab on the connector and pull it straight off the throttle body. Do not pull on the wires themselves. Move the harness aside to prevent interference during removal.
4. 4

   Inspect for additional connections
   Check for any vacuum lines, PCV hoses, or brake booster lines connected to the throttle body assembly. On the 2008 Viper V10, verify your specific configuration for any vacuum lines, PCV hoses, or brake booster connections at or near the throttle body, and disconnect any present lines by carefully pulling them straight off their fittings. Note their positions for reinstallation.
5. 5

   Remove throttle body mounting bolts
   Locate the throttle body mounting bolts securing the throttle body to the intake manifold plenum. Using the correct socket and ratchet with extension as needed, remove all bolts in a cross pattern (alternating corners) to prevent binding. Keep the bolts together as they will be reused unless damaged.
   Torque spec

   Throttle Body Bolts10 Nm (7 lb-ft)
6. 6

   Remove throttle body assembly
   Carefully pull the throttle body assembly straight off the intake manifold. It may require slight wiggling to break the gasket seal, but should not require excessive force. Once free, lift it away from the engine and set it on a clean work surface with the mounting flange facing up to prevent dirt entry.
7. 7

   Remove old gasket and inspect mating surface
   Remove the old throttle body gasket from the intake manifold surface. Use a plastic scraper if needed to carefully remove any stuck gasket material. Do not use metal scrapers that could gouge the aluminum surface. Inspect both the intake manifold and throttle body mounting surfaces for damage, warping, or deep scratches. Clean both surfaces thoroughly with electronic parts cleaner and allow to dry completely. Inspect the throttle body bore for carbon buildup if reusing the unit.
8. 8

   Install new throttle body gasket
   Position the new throttle body gasket onto the intake manifold mounting flange, aligning the gasket holes with the mounting bolt holes in the manifold. The gasket should sit flat without gaps or bunching. Do not use gasket sealant unless specified by the replacement throttle body manufacturer.
9. 9

   Install throttle body assembly
   Position the throttle body (new or cleaned original) onto the intake manifold, aligning the mounting holes with the gasket and manifold bolt holes. Ensure the throttle body is oriented correctly with the electrical connector position matching the harness location. Press the throttle body gently but firmly against the gasket to seat it properly.
10. 10

    Install and torque mounting bolts
    Start all throttle body mounting bolts by hand to prevent cross-threading. Once all bolts are finger-tight, use a torque wrench with the correct socket to tighten them in a cross pattern (diagonal corners alternating) to the manufacturer-specified torque value (verify against factory service manual). Make at least two complete passes in the cross pattern to ensure even clamping pressure and proper gasket compression.
    Torque spec

    Throttle Body Bolts10 Nm (7 lb-ft)
11. 11

    Reconnect electrical connector
    Push the throttle position sensor electrical connector onto the throttle body connector until you hear and feel a positive click indicating it is fully seated and locked. Gently tug on the connector body (not the wires) to verify it is secure.
12. 12

    Reconnect air intake tube
    Position the air intake tube onto the throttle body inlet, pushing it fully onto the inlet neck until it seats against the stop. Tighten the hose clamp by turning the screw clockwise with a flathead screwdriver until the clamp is snug and the tube is securely sealed against the inlet. Ensure the tube is fully seated and the clamp is positioned over the ribbed section of the inlet for proper sealing.
    Torque spec

    Air Intake Hose Clamps3 Nm (2 lb-ft)
13. 13

    Reinstall engine cover and reconnect battery
    Align the engine cover grommets with the mounting posts on the engine and press down firmly at each corner until all grommets are fully seated. Reconnect the negative battery cable to the battery terminal and tighten securely.

Reassembly

1. Reassembly follows the reverse order of disassembly as detailed in the installation steps above
2. Ensure all electrical connections are fully seated and locked before starting the engine
3. Verify all hose clamps are tightened to specification to prevent air leaks

Verification

• Turn ignition to ON position (do not start) and verify no warning lights related to throttle control remain illuminated after initial bulb check
• Start engine and allow it to reach operating temperature while monitoring for smooth idle
• Check for air leaks around the throttle body by listening for hissing sounds and inspecting all connection points
• Test throttle response by slowly pressing the accelerator pedal and verifying smooth engine response without hesitation or surging
• Perform a test drive and verify normal throttle operation under various load conditions
• If idle hunting or rough idle occurs initially, allow the PCM to complete its idle relearn process over 2-3 drive cycles before concluding there is a problem

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