Spark Plug Gap Specifications

The 2008 Chrysler Aspen with a 4.7L V8 engine requires specific spark plug gap settings for optimal performance. The recommended spark plug gap for this vehicle varies depending on the location of the spark plugs:

  • Upper bank (intake side): 0.039 inches (1.0 mm)
  • Lower bank (exhaust side): 0.051 inches (1.3 mm)

It's crucial to note that this engine uses a dual-plug system, meaning there are two spark plugs per cylinder, totaling 16 spark plugs.

Importance of Correct Spark Plug Gap

Proper spark plug gapping is essential for:

  • Ensuring efficient combustion
  • Maximizing fuel economy
  • Maintaining engine performance
  • Reducing emissions

An incorrect gap can lead to misfires, poor acceleration, and increased fuel consumption.

Spark Plug Types

The 2008 Chrysler Aspen 4.7L engine typically uses:

  • Iridium spark plugs for the exhaust side (lower bank)
  • Copper spark plugs for the intake side (upper bank)

However, using iridium plugs for both banks is acceptable and can potentially improve performance and longevity.

Gapping Your Spark Plugs

When gapping spark plugs for your Aspen:

1. Use a specialized spark plug gapping tool

2. Measure the existing gap carefully

3. Adjust the gap by gently bending the ground electrode

4. Recheck the gap after adjustment

5. Be extra cautious with iridium plugs to avoid damaging the delicate center electrode

Maintenance Schedule

For the 2008 Chrysler Aspen 4.7L:

  • Replace spark plugs every 30,000 miles for copper plugs
  • Iridium plugs can last up to 100,000 miles, but should be inspected regularly

Always consult your vehicle's manual for specific maintenance intervals.

Common Issues

Some owners have reported:

  • Difficulty accessing all 16 spark plugs
  • Confusion over the dual-plug system
  • Premature wear on lower bank (exhaust side) plugs

If you're unsure about performing this maintenance yourself, consult a professional mechanic familiar with Chrysler vehicles.

FAQs About 2008 Chrysler Aspen 4.7 Spark Plug Gap

    • Can I use the same gap for all spark plugs?
      No, the upper and lower banks require different gap settings for optimal performance.
    • How critical is the exact gap measurement?
      While small variations (within 0.002 inches) are generally acceptable, it's best to aim for the exact specified gap for optimal engine performance.
    • Are pre-gapped spark plugs available for this engine?
      Yes, but always double-check the gap before installation, as shipping and handling can alter pre-set gaps.