Sparkplug engine car shaking
Only my right sparkplug turns black every week and then my car starts shaking when I drive?
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@yahvehhuisraad this will depend what the spark plug face actually looks like.
If it is black with soot, it is most likely because of a bad air/fuel mixture. To address this, we will need to know the exact year and model for your Vitz. Make sure you have the right spark plugs installed.
If it is black and full of oil, you are burning to much oil which can be caused by bad valves or bad piston rings etc. For that you would need to start with a compression test or better, a leak down test.
This "then my car starts shaking" is because your spark plug does no longer fire properly (if at all ) and thus your engine performance goes down, your car will have poor fuel mileage and poor idle etc.
Let us know what you find out.
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When compression is low, the spark plug will usually become coated with a black, oily deposit.
But it could be something else. I'd swap the sparkplug and wire and see. If the problem now resides in a different cylinder, then I'll need to replace the wire and sparkplug. The ignition coil could also be the issue.
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