Question about 1995 Saturn Sl

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I have a 1995 Saturn Sl and my car right now is idling and driving some what rough with a little bit of power loss but no loss of fuel economy. The spark plugs are fairly new and so are the wires and coil packs. Also when I accelerate I get preignition detonation but knock sensor and egr valve is new and fuel is 93 octane with the same issue only thing I can think of is maybe the egr passageways need to be cleaned but other then that I have no clue. What could be the issue?

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The egr passageway may need cleaning, and doing so would not hurt. As a matter of fact, a good thorough deep cleaning of the entire plenium would be a good idea and may partially solve (or even solve) your problem. But, I suspect that it is your fuel filter. Try changing your fuel filter, it is simple, cheap, and should fix your problem altogether.

Posted on Sep 05, 2010

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