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When misfires occurs; performance suffers along with fuel economy; emissions and idle quality.
So, What causes misfires? Basically, it’s one of three things:
- Loss of spark; the air/fuel mixture is out of balance
- lack of compression.
- Loss of spark
Causes include worn; fouled or damaged spark plugs. Bad plug wires or even a cracked distributor cap.
Consequently, A weak coil or excessive rotor gap; inside a distributor would affect all cylinders; not just a single cylinder.
“Lean misfires” can occur when the air/fuel mixture is too lean to burn. Usually, Caused by a dirty; clogged or inoperative fuel injector. Or, Air leaks or low fuel pressure; because of a weak pump. In addition; A restricted filter or leaky pressure regulator.
But, Low fuel pressure would affect; all cylinders rather than an individual cylinder. A leaky (EGR) valve can also have the same effect as an air leak, causing a misfire.
So, for your engine to fire its cylinder, it relies on three main components. Because, it needs fuel to burn, oxygen to facilitate the burn reaction, and a spark to get things going. If any of those elements are not present at the perfect time, the cylinder won’t combust. It won’t start the chain reaction that leads to a well-running engine.
Finally, With loss of compression the most likely causes; are a leaky exhaust valve or a blown head gasket. So, If two adjacent cylinders are misfiring; it’s likely the head gasket. Also, if an engine is overheating or losing coolant; it’s likely the head gasket is the culprit.
Thank You !