I bought the car in January. I changed the spark plugs last week, there was nothing left of the plugs that were in already. Now it's running like **** with new plugs in, why?
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Not without more testing. It could be a fuel problem or something mechanical like a valve. You would do a compression test next to verify all 4 cylinders have normal compression. If they do, and that 4th plug wire was providing spark to the plug, I would expect you to find something going on with the injector.
Changing the plugs probably had nothing to do with it. White smoke is usually a sign the engine is burning coolant or trans fluid. You might want to check those fluid levels. If the coolant is low, you may have a leaking head gasket or intake gasket.
Look and make sure your computer is good! PCM could be failing you! Injectors don't really go bad! Also look at you fuel pressure make sure it's strong!
hey i actually just dealt with this problem last week ona friends car. the oil in the center with the spark plugs is because you need a new valve gasket. not a cover unless its cracked just the gasket and it costs about 25 dollars at your local parts store. its very easy to install and a quick fix but try to get all the oil out of the center as you can and rub a little bit of old oil on the gasket before you install it. it helps stop dry rot. try this first and then see if the backfiring and stalling stops. if not, you may need to change your spark plugs again even if you already have because chances are the oil thats already in the hole has burned up the spark plug. so give your spark plugs a good check while you change your valve gasket.
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