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HOMESERVICE MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 237 (ENGINE CONTROLS - REMOVAL & INSTALLATION)IGNITION SYSTEMSSPARK PLUGSINSTALLATION (3.4L)
1998 Chevrolet Suburban K2500, 7.4 J, Part Time

Installation (3.4L)

1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Installation (3.4L)
WARNING: This page is about a different car, the 2003 Pontiac Grand Am and 2003 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: It is important to check the gap of all new and reconditioned spark plugs before installation. Pre-set gaps may have changed during handling. Use a round wire feeler gauge to be sure of an accurate check, particularly on used plugs. Installing plugs with the wrong gap can cause poor engine performance and may even damage the engine.
  1. Gap the spark plugs to the specifications. See SPARK PLUGS under IGNITION SYSTEMS in SERVICE & ADJUSTMENT SPECIFICATIONS - ALERO, GRAND AM & MALIBU article.
    2. CAUTION: Ensure plug threads smoothly into cylinder head and is fully seated. Use a thread chaser if necessary to clean threads in cylinder head. Cross-threading or failing to fully seat spark plug can cause overheating of plug, exhaust blow-by, or thread damage. Follow the recommended torque specifications carefully. Over or under-tightening can also cause severe damage to engine or spark plug.
  2. Install the spark plugs to the engine. Tighten the spark plugs to specification. See TORQUE SPECIFICATIONS  .
  3. Install the spark plug wires to the spark plugs.
  4. After replacing the engine right bank (rear) spark plugs, perform the following steps:
    • Return the engine to the proper position.
    • Position the wiper motor cover to the wiper motor.
    • Install the wiper motor cover screws. Tighten the screws to specification. See TORQUE SPECIFICATIONS  .
    • Connect the wiper motor harness connector.
    • Position the air inlet grille panel to the vehicle.
    • Install the air inlet grille panel push-in retainers to the panel.
    • Connect the washer tubing to the air inlet panel.
    • Install the wiper arms and blade assemblies.
    • Close the hood.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.