1. Engine has a rough idle.
Your engine idles when it is a stationary and in this position the engine normally produces around 1000rpm. The sound the engine gives off is constant and smooth but if your spark plugs aren’t performing as they should, your engine will produce a rough and jittery sound while producing larger vibrations through the car. Not having this checked can lead to costly damage being done.
2. Having trouble starting your car?
If your spark plugs don’t produce the spark needed to get the vehicle moving, then you’re going nowhere. It is also possible that faulty spark plugs are causing your battery to drain.
3. Your engine misfires.
When your engine misfires it causes the vehicle to halt for a fraction of a second and then continues it’s usual movement.
4. Engine surging.
When a vehicle sucks in more air than usual in the combustion process it can cause the vehicle to jerk and then slow down or continually start and stop, which means the vehicles engine is working inefficiently.
5. High fuel consumption.
If your spark plugs have deteriorated you’ll notice that your vehicles fuel economy can decrease by up to 30%
6. Lack of acceleration.
If your vehicle is accelerating poorly it is fairly easy to tell. It feels as if the vehicle doesn’t want to respond when you put your foot down, or it does but not instantly as you’ve become accustomed to.
Courtesy of motoringabout.com: http://bit.ly/1fESDnK
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