Question about 1999 Saturn SL

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Car runs great except it has a rattle in the mid range ?

Starting up and in idle it sounds great but in the mid range it has a rattle inside

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Possible Answers:

  1. Upper engine mount may need replacing
  2. engine fan housing is loose
  3. loose/bad lifters
  4. running low on oil, lifters are dry.

Posted on Apr 11, 2014

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This may be detonation from incorrect air/fuel /timing combination. IT is generally lean mixture and mostly can be heard on acceleration. Run fault codes to find faulty sensor that is affecting the correct air fuel mixture.

Posted on Mar 21, 2014

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The dieseling you speak of is sometimes caused by too much fuel left in intake after shutting off. Engine keeps turning over and firing from hot carbon deposits inside your cylinders igniting the unburnt fuel. It could be from a rich running condition. Buy a can of liquid Seafoam. 1/3 in gas tank, 1/3 in oil crankcase, and 1/3 poured slowly into intake with car running at a fast idle (may need to bump gas a little to keep it from dying: keep your engine running. May smoke a lot, but its just your engine cleaning out, loosening up the carbon and burning it off. It will keep smoking for awhile, but after a few moments driving, it should begin to clear up. If your engine is in good shape, you may notice the difference immediately in better power smoother performance.

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Sounds like you need a new exhaust.

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