What is the method for adjusting spark plug gap?
2 Answers
The method for adjusting spark plug gap is: 1. Determine the standard gap value for your vehicle's spark plugs. You can use a large flat-head screwdriver with the spark plug metal casing as a fulcrum to pry; 2. Use a feeler gauge to find the appropriate metal blade that matches the spark plug gap; 3. Insert the corresponding thickness blade from the feeler gauge into the spark plug gap - if it fits snugly, it means the spark plug gap matches the blade thickness (multiple feeler gauge blades can be stacked if needed); 4. Select a 0.9mm or 1.0mm blade from the feeler gauge, place it between the spark plug electrodes, and use pliers to adjust until the blade fits snugly; 5. Repeatedly test with the feeler gauge until the blade fits properly.
I've adjusted spark plug gaps several times myself and find it quite practical for saving repair costs. First, get a feeler gauge - it's like a thin metal strip that precisely measures the distance between electrodes. After removing the spark plug, insert the gauge to check the gap size, which should normally be between 0.6 to 1.2 mm (refer to your manual as specifications vary by vehicle model). If the gap is incorrect, gently bend the ground electrode to adjust it, but avoid using excessive force as the electrode may break. Always re-measure after adjustment to confirm. Too small a gap weakens the spark causing poor engine performance, while too large a gap leads to misfires and increased fuel consumption. After my last adjustment, my old car started much smoother and accelerated better. Checking spark plugs every six months and cleaning carbon deposits can extend engine life. DIY only takes about 15 minutes with inexpensive tools, and learning basic car maintenance really helps with daily driving.
