When Should You Replace Spark Plugs
Replace the spark plugs for your vehicle with new ones at the intervals recommended in the routine maintenance. The best advice for you when replacing the spark plugs is to buy the new ones first and then adjust them to the proper gap according to the specification of your car. When you buy new spark plugs, you must be sure to obtain the correct plug type for your particular engine. Check this information in the owner ‘s manual, or auto data book or ask your auto parts store. The gap is checked by inserting the gauge between the electrode at the tip of the spark plug. You never remove the spark plugs when your car engine is hot. Wait for the engine to cool if not you can break them, or damage the thread on the cylinder head . While you waiting check the new spark plugs for defects and adjust the gap. Misfiring and bad starting can be caused, if you don’t check and adjust your spark plugs gap and type.
How To Inspect Your Spark Plugs Problems
The spark plugs function is for the correct running and efficiency of your engine. They should be changed and renewed every service 10000 or 15000km. If misfiring or bad starting is caused before you renew them, they must be removed, cleaned, and the gap must be adjusted. If you check the condition of the spark plugs they can also tell you much about the overall condition of the your engine. To save you time and money you can do this inspection your self.
The inspection of the deposits on electrodes can be a helpful guide when tuning. On normal spark plugs and normal mixed periods on high and low speed driving the deposits should be powdery and range in color from brown to grey. If you driving fairly constant speed or low speed town driving will produce white or yellow deposits.
Spark Plugs Problems And Symptoms
The black and dry full deposits are caused by the incomplete combustion and indicate running with rich mixture, excessive idling and possibly defective ignition.
Overheated spark plugs have a white or light grey look around the center electrode and the electrodes themselves will appear blue and burnt. This may be due to weak mixture, poor cooling, incorrect ignition or sustained high speed running with, or your vehicle heavily loaded. Identify the cause of overheating and rectify.
Why Your Car Misfiring Or Bad Starting ? Black wet deposits result from oil in the combustion chambers and can be caused from worn pistons, rings, valve stems, or scored cylinder bores. The spark plugs which run hotter may alleviate this problems temporarily. You engine is going to misfire due to the oil covering the firing end. The cure is in your car engine overhaul.
Compare your spark plugs to those shown in the accompanying photos to get an indication of the general running of your car engine.
Grayish to white colour around the insulator at the firing. Confirms that the plugs is the appropriate heat range and has been firing correctly.Indicates the fuel and the ignition are good and the engine mechanically sound. Not required to check the gap and replace.
Soft black sooty deposits on the fire end. Rich, air fuel mixture, weak ignition or spark plugs to cold these are the causes. Carbon deposits are conductive and can create earth leakage paths. Most of the time misfire problems which can lead to catalyst damage. To solve the problem check the fuel and ignition systems and general engine performance.
Light detonation causes black/grey spot on the insulator or on the electrode. Severe detonation can crack even break the insulator or the ground electrode. Its caused by abnormal combustion, pressure spickes chock waves in the combustion chamber. Inoperative exhaust gas re-circulation system. Defective detonation sensor.Lean air mix, incorrect fuel octane rating. Effect misfire poor and uneven running may result in engine damage. Identify the cause and replace the spark plugs on remedy you have.
Fuel additives reddish/brown or purple deposits, coloration on the core nose insulator. Caused by use of the fuel additives. Your car is going to misfire and normal additives they not conductive. If its excessive can create an earth leakage. For this problem, replace the spark plugs and ensure that any additives used are compatible with the engine, ignition and emission systems and added in the correct proportions.
Corona discharge is discoloration of the ceramic insulator near the shell. Can be caused by oil or gas in the spark plug becoming attracted to the ceramic. Detrimental to the spark plug operation. You must be sure the plugs are clean before you fit them.
Black burn marks carbon track running down spark plug insulator towards the shell.Due to the poor fitting. Your car engine is going to misfire in this case replace the damage plugs and the plug wires (leads).
Light brown deposits on the centre or ground electrode. Due to the excessive fuel or oil. Or your engine wear can have similar effect on the spark plug. If there is an ash shield the spark is going to lead to the misfiring problems. Ensure that the spark plug is of the proper heat range and check for engine wear.
I, Fouzi thank you for subscribing and visiting my website. My Car Symptoms, is my new e-book subscribe now . The part one ( How You Diagnose Your Car Problem To Save Money ) is Free for you is limited edition . If your car is in need of spark plugs contact me at Fouzis Service Centre for free quotation and prices. Learn more about spark plugs on this article automotive plugs.