Hi folks, So after 8 months of owning my prius I started to take care of it , so the easiest thing to do was to change the spark plugs, it was an easy job , the only hard part was the last coil connector. As you can see in the attached pic , the second has some oil on it from the outside and the last one is rusty, I was a bit scared to see the oil on the plug but after some search it seems to be a minor issue. I don't know much about spark plugs , so do they look normal to you?
The oil is OK. The rust shows you that water has dripped down into the spark plug well. Usually that happens because water drips down from the center seam of the cowl above the engine. Or, maybe someone steam cleaned the engine and got the valve cover wet. It would be good if you could prevent water from getting on the engine valve cover, now that you have installed new plugs. Your photos do not show the porcelain insulator surrounding the center electrode on the firing end of the spark plug. The insulator should be an off-white or very light brown color and should not have wet oil or gasoline deposits.
Thanks Patrick , it seems that my plugs have some deposits on the insulator , the attached insulator shows the insulator of one of the plugs
Well, that photo needs more lighting, but it does appear that the ground electrode has an unusual amount of deposits. It is possible that very cheap fuel was used by the prior owner. It would be interesting to see what your engine's pistons and valves look like.
You are right , I also hear a fuel injector noise coming from the engine , I live in Jordan ,and although I fill it with Octane 90 , it seems that the fuel quality is not up to the standard. Is there any possible recommendation to clean the injectors or do some maintenance to prevent any future effects.
In the US, Chevron markets a fuel injector cleaner called Techron, which works well. Amazon.com: Chevron Techron Fuel System Cleaner, 20 oz. (65740): Automotive Perhaps you can find something similar in your country?
Water had gotten into the spark plug well that the rusty plug came out of. That can cause engine misfire.
Oil on the outside of the plug is not oK You have a leaking valve cover gasket the oil is getting Past the old gasket and into the spark plug well Eventually it will get so high it will short out the cop or at the least it will throw a misfire Very common on cars with 4 cylinder motors So common I had a valve cover gasket ready to go when I changed the plugs I borescoped my plug wells before removal of plug and sure enough one cylinder had about an inch of oil in it
