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replace plugs, if already replaced, replace coil that is plugged into sparkplugs.
Could be many things really - but yes if plugs are old, replace them first. Engines also misfire when they do not have the expected amount of fuel and air, so any problem with either of those could cause a misfire (air filter clog, fuel pump dying, bad fuel injector, bad wiring to the plugs or fuel injectors). Not likely, but if you hear a lot of noise, a bad timing chain could also be responsible.
It is also possible that a bad MAF or O2 sensor could cause a misfire. If your O2 sensors are old (>100k miles) you should replace them, only use genuine Denso replacements (they can be bought for around $35 shipped), other brands do not work well with Toyota's extra sensitive requirements.
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What is random cylinder misfire?
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Would clogged fuel injector cause cylinder 2 misfire?
It could.
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If you have a "check engine" light on, start with having the codes read. A misfire code can tell you which cylinder or cylinders are having problems. A misfire could be the cause of your engine vibration.
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Bad plugs, wire , or coil pack.
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sounds like a cylinder misfire..check spark plugs and wires..usually a code will show which cylinder it is, should replace all though
2001 Toyota Corolla 1.4 GS engine misfiring?
There are a number of reasons why a 2001 Toyota Corolla 1.4 GS engine would misfire. Coils are one common cause. Another common cause is the fuel delivery system.
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bad spark plugs or bad wire connection to the spark plug
What would cause a misfire in a cylinder of a 2001 Ford Expedition Eddie Bauer 5.4L engine?
Most likely a bad coil (each cylinder has one) located at the top of each spark plug
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I talked to mechanic and he fixed 5th cylinder misfire on Dodge engine by changing chank shaft postition sensor. It came out on code reader though.
What would cause a cylinder 3 misfire in a 2003 Mitsubishi Eclipse GTS?
Usually a bad coil , or plug. if the injector was bad , the computer would have coded for it. But the cylinder 3 coil and plug arent that easy to get to. Its the one at the fire wall
