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1995 saturn sl1 smoking engine knocking

My car always had smoke from the exhaust on 1st take offs that was whitish. It is now grey/black, even bluish maybe since I changed the oil filter yesterday. Dont have a blown head to my notice, she runs and drives, just rough. Also recently started a rat tat tat and loud knocking like sound from the engine. I usually noticed this kind of noise but less extreme if u ran out of oil, she burns it quickly. Oil is topped off, iv tried all weights that are safe to see if it would ease the noise but I'm afraid it may only be getting worse. I definitely think it COULD be oil related since the knock is SIMILAR but its not exactly the same, its louder and rougher. Also dealing with a crap battery which has added to the poor performance of her but once u get her going she usually opens up like she should for u. Any ideas on what it could be or what would fix this? Or if its a dying or dead motor or..anything?! I'm desperate to get my car going if possible but if not I need i know, I'm a single mama and would need to handle the works ASAP!

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I recommend you few help links related to your problem.Click the link below and follow the troubleshooting;-----Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html-----------
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This will help.
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