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It is general question concerning DENSO SPARK PLUG that is often.
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| A loud explosive "pop" pop sound can have the following two causes: (1) An afterfiring muffler (2) Backfiring due to blowback from the carburetor If it is the same vehicle and these symptoms were not there before changing to the new plugs, the reason for this is (1) afterfiring. The causes of afterfiring are: (1) An abnormally elevated intake pressure, the combustion becomes unsteady (during engine brake) (2) A problem with an ignition device (improper ignition timing, misfiring) (3) The fuel-air mixture is too rich (problem with the carburetor, too much choke) (4) The valve timing is off If the problem is during starting, (2), (3), or (4) are thought to be the reason. A specific example for (2) is "ignition timing that is off" and specific examples for (3) include "a dirty air cleaner" and "pulling the choke too much." We often hear that Iridium plugs improve ignitability so much that people "don't have to pull the choke to start the engine." If you are pulling the choke to full, try pulling it to the "halfway" point and see if this solves the problem. |
