Ignition Coils - All

This procedure replaces all ten ignition coils on the 1992 Dodge Viper's 8.0L V10 engine, including removal of the intake plenum and associated components for access.

Warnings

Tools required

Parts

• Ignition coil × 10 — Use OEM specification
• Spark plug × 10 — Champion RC12LYC or equivalent
• Intake plenum gasket × 1 — Use OEM specification
• Throttle body gasket × 1 — Use OEM specification

Preparation

1. Ensure engine is completely cool to the touch
2. Disconnect negative battery cable and secure away from battery post
3. Remove engine cover if equipped
4. Label all vacuum lines, electrical connectors, and coil positions with tape or marker to ensure correct reinstallation
5. Relieve any residual fuel system pressure by loosening fuel cap

Procedure

1. 1

   Disconnect throttle cable and remove air intake components
   Disconnect the throttle cable from the throttle body by removing the cable end from the throttle lever and unclipping the cable housing from the bracket. Remove the air intake tube by loosening the clamps at the throttle body and air box, then remove the entire air intake assembly. Set aside in a clean area.
2. 2

   Disconnect vacuum lines and electrical connectors
   Disconnect all vacuum lines connected to the intake plenum, noting their positions (use labels if needed). Disconnect the MAP sensor electrical connector, IAC valve connector, and TPS connector from the throttle body. Disconnect the fuel injector harness connectors on both cylinder banks.
3. 3

   Remove throttle body
   Remove the 4 throttle body mounting bolts and carefully lift the throttle body away from the intake plenum. Remove and discard the old throttle body gasket. Cover the plenum opening with a clean rag to prevent debris entry.
4. 4

   Disconnect fuel rail
   Disconnect the fuel supply and return lines from the fuel rail using appropriate line disconnect tools. Remove the fuel rail mounting bolts (2 per side, 4 total) and carefully lift the fuel rail with injectors attached away from the intake manifold. Support the fuel rail assembly to prevent strain on injector connectors.
5. 5

   Remove intake plenum
   Remove the 10 intake plenum mounting bolts in a crisscross pattern starting from the outer bolts and working inward. Carefully lift the plenum away from the intake manifold runners. Remove and discard the old plenum gasket. Cover the intake runners with clean rags to prevent debris entry.
6. 6

   Remove ignition coils from left cylinder bank
   Starting with cylinder 1 (front left), disconnect the electrical connector from the ignition coil by pressing the release tab and pulling away. Remove the single ignition coil bolt securing the coil to the valve cover. Carefully pull the coil straight up to extract it from the spark plug well. Repeat this process for cylinders 3, 5, 7, and 9 (all left bank cylinders).
7. 7

   Remove ignition coils from right cylinder bank
   Repeat the coil removal process for the right cylinder bank (cylinders 2, 4, 6, 8, and 10). Disconnect the electrical connector, remove the mounting bolt, and extract each coil from its spark plug well. Inspect each coil boot for damage or carbon tracking.
8. 8

   Remove spark plugs
   Using a 5/8 inch spark plug socket with extension, remove all 10 spark plugs. Inspect each plug for wear, fouling, or abnormal deposits. Note any cylinders showing unusual conditions for further diagnosis. Keep spark plugs organized by cylinder number if inspecting for troubleshooting purposes.
9. 9

   Install new spark plugs
   Install spark plugs per the plug manufacturer's instructions (many modern plated plugs specify NO anti-seize). If anti-seize is used on aluminum heads, reduce torque accordingly. Hand-thread each plug to avoid cross-threading. Hand-thread each spark plug into its cylinder to prevent cross-threading. Torque all spark plugs to specification using a torque wrench.
10. 10

    Install new ignition coils
    Apply a thin coating of dielectric grease to the inside of each new coil boot to aid in future removal and prevent moisture intrusion. Install each new coil by aligning it with the spark plug and pressing down firmly until it seats completely. Install the coil mounting bolt and torque to specification. Reconnect the electrical connector to each coil, ensuring a positive click. Install all coils for both cylinder banks.
11. 11

    Reinstall intake plenum
    Remove the protective rags from the intake runners. Position the new intake plenum gasket on the intake manifold, ensuring all bolt holes and port openings align correctly. Carefully lower the plenum into position, aligning all mounting bolt holes. Install all 10 plenum bolts finger-tight, then torque in a crisscross pattern from center outward to specification.
12. 12

    Reinstall fuel rail and throttle body
    Position the fuel rail assembly back onto the intake manifold, ensuring all injectors seat properly into their bores. Install and torque the fuel rail mounting bolts to specification. Reconnect the fuel supply and return lines. Install a new throttle body gasket, position the throttle body, and install the mounting bolts. Torque the throttle body bolts to specification.
13. 13

    Reconnect all electrical and vacuum connections
    Reconnect all electrical connectors: fuel injector harnesses, MAP sensor, IAC valve, and TPS. Reconnect all vacuum lines to their original positions using your labels as reference. Ensure all connections are secure and fully seated.
14. 14

    Reinstall air intake and throttle cable
    Reinstall the air intake assembly, ensuring all clamps are tight at the throttle body and air box. Reconnect the throttle cable to the throttle lever and secure the cable housing in its bracket. Verify throttle operates smoothly through full range of motion. Replace engine cover if equipped.
15. 15

    Reconnect battery and perform initial start
    Reconnect the negative battery cable. Turn the ignition key to the ON position (without starting) for 5 seconds to prime the fuel system, then turn off. Repeat this 2 more times. Start the engine and allow it to idle. Monitor for smooth operation, unusual noises, or warning lights.

Reassembly

1. All reassembly steps are included in the main procedure steps
2. Verify all electrical connectors have been reconnected and clicked into place
3. Double-check that all vacuum lines are connected to their original positions
4. Ensure no tools or rags were left in the engine compartment

Verification

• Engine should start and idle smoothly without misfires or rough running
• Check for fuel leaks around fuel rail connections
• Check for vacuum leaks by listening for hissing sounds around intake plenum and throttle body
• Verify throttle response is smooth and immediate with no hesitation
• If available, use a scan tool to check for any misfire codes or ignition system faults
• Test drive vehicle to confirm normal acceleration and no check engine light illumination

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