Re: Ihave 1999 bmw ti. How do i change the spark plugs
before you can get into spark plugs your have to remove plastic covers then also remove the plastics on the bulk head unless you have small hands to get into back plug ---- after you have don this you have to then remove each individual connector on plug --- these can be tricky you have to twist unlitl they release and you could get into plug --- hope this helps
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Since your check engine light is on, you should try to get it read at Autozone. They will do this for free and it will narrow your search for your problem. It could be a couple of things. It could be as simple as a fuse or clogged air filter to bad spark plugs. Have you did anything to it?
Bosch plugs are the best for the bmw's. Oil is up to how much money u want to spend. If you go with the best you have to keep using the best. I run synthic oil in my vehicles. It breaks down alot slower.
you may want to check the engine's timing. You may want to check also the spark plugs as it may tell you if you are advanced or not. A black tip spark plug would tell you that the timing is late while a little white is advanced. You need is a light brown color. If there is no problem on the timing you may want to check on the fast idle control valve and pcv if it needs a little cleaning.
You should have your fuel lines cleaned out have your spark plug's checked, Aswell as your air intake and you should also have the timing checked and that the plug are firing at the right time - Al these things can contribute to the problem since I have limited informtion this is al that I can tell you at this stage.