TOP 13 CAUSES OF ENGINE MISFIRE - DIY FIXES

#enginemisfire #misfire
An engine misfire, also known as a cylinder misfire, occurs when one or more engine cylinders don't produce enough power. This can happen when the combustion within the combustion chamber is incomplete or doesn't happen at all. In this video, we are going to discuss the different causes of engine misfire and how to fix it.
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TimeStamp
00:00 Introduction
00:26 Faulty Spark Plugs
00:46 Vacuum Leaks
01:15 Low-Quality Fuel
01:45 Bad Ignition Coil
02:14 Bad Fuel Injector
02:39 Bad Fuel Pump
03:00 Bad MAP Sensor
03:27 Blown Head Gasket
03:56 Bad Piston Ring
04:22 Bad EGR Valve
04:53 Bad Camshaft Position Sensor
05:19 Bad Crankshaft Position Sensor
05:44 Overheated Engine
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Disclaimer:
This video is just for educational purposes only. We are not in the auto repair business nor publish automotive service manuals. This video is not reviewed or authorized by any vehicle manufacturer. This video is intended only as general guidance. Every system is slightly different, so refer to the owner’s manual of your vehicle for any specific information about your model. Remember that only proper service and repair procedures will ensure your car's safe and reliable operation.
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[@abautomotive2886]

For a misfire limited to a particular cylinder (as opposed to random misfire between all cylinders):
1. Bad/worn/contaminated spark plug
2. Ignition coil failure (coil-on plug) (often a concequence of running the engine with worn spark plugs)
Those two are by far the most common reasons. Much more rare:
3. Injector failure
4. Leaking/burnt valves
5. Failed valvetrain components (lifters, camshaft lobes, pushrods, valve springs, rocker arms)
6. Leaking head gaskets (actually, resulting in spark plug fouling by calcium deposits)
7. Damaged pistons, conrods or bearings
8. Manifold vacuum leaks (injector seals, although sometimes manifold gaskets too)
9. Wiring problems for injector or coil circuit (including internal PCM/control module issues)
In about that order, resulted on 30 years of experience with different makes and models
All other stuff mentioned here is rather a fuel mixture/fuel trim issues that might be resulting in random misfire as a consequence of too lean or too rich mixture.

[@AmbA4]

What about diluted/bad oil?

[@MechanicalSpecial]

Yeah bad engine oil may also cause engine misfire if it starts to leak into the combustion chamber.

[@anthonynicholls9415]

👍

[@maxst2]

No... thats detonation.