TECHIE T-D8C Spark Plug Replace for NGK 2120 D8EA Spark Plug,for Denso X24ES-U,for Champion A6/4099,for Bosch X4CS,for Autolite 2755 3954 4132,for ACDelco S121XL,for John Deere TY26724,OEM

TECHIE T-D8C Spark Plug Replace for NGK 2120 D8EA Spark Plug,for Denso X24ES-U,for Champion A6/4099,for Bosch X4CS,for Autolite 2755 3954 4132,for ACDelco S121XL,for John Deere TY26724,OEM

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  • 14-Day Returns
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Returns and Refunds

We offer a return/refund policy within 14 days of delivery.

（14 days replacement if defective）

To be eligible for a refund, the returned item must be in unused and resalable condition, in its original packaging or equivalent, and contain all tags, instructions, and components.

You will need to contact us via email before returning your item: support@techieautoparts.com

If your return is accepted, you will receive instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.

Approved refunds: will be processed within five business days, and the refunded amount will be automatically transferred to your original payment method.
TECHIE T-D8C Spark Plug Replace for NGK 2120 D8EA Spark Plug,for Denso X24ES-U,for Champion A6/4099,for Bosch X4CS,for Autolite 2755 3954 4132,for ACDelco S121XL,for John Deere TY26724,OEM

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Spark Plugs Nstallation Process

  • Ensures Correct Compatibility
    Proper heat range, size, and gap specifications prevent misfires, engine damage, or poor performance.
  • Prevents Installation Errors
    Accurate torque settings avoid thread damage (over-tightening) or gas leaks (under-tightening).
  • Enhances Safety & Longevity
    Correct installation prevents electrical hazards, overheating, and premature wear, extending spark plug life.
  • Optimizes Engine Efficiency
    Properly installed spark plugs improve combustion, fuel economy, and reduce emissions.

Common Failures & Self-Check

1. Engine Misfire & Power Loss
Symptoms: Rough idling, hesitation, or check engine light (Code P030X).
Self-Check: Swap coils between cylinders—if the misfire moves, the coil is faulty.

2. Difficulty Starting or No Start
Symptoms: Cranking but no ignition, weak spark.
Self-Check: Inspect for cracks, burns, or oil contamination on the coil.

3. Increased Fuel Consumption & Poor Performance
Symptoms: Reduced acceleration, higher fuel usage.
Self-Check: Use an OBD2 scanner to check for misfire-related codes.

4. Visible Damage or Electrical Issues
Symptoms: Burnt smell, arcing, or corrosion.
Self-Check: Measure resistance (primary: 0.5–2Ω; secondary: 5k–15kΩ).