Bad smelling exhaust...

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  #1  
Old 02-03-07, 02:02 PM
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Bad smelling exhaust...

We have a 1990 Dodge Caravan and the exhaust is foul. Not in color, but in smell. It does not smell like regular exhaust at all - I can't describe the smell, but it's like it's burning something it shouldn't be. It is known to burn oil, but that sort of stopped after adding a Stop Smoke additive. Since it has been known to burn oil and the additive is in the oil, could it be burning that instead, causing a bad smell? Could it be related to Ethanol blended gas that is used in this vehicle sometimes?

Thanks for any ideas!
 
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  #2  
Old 02-03-07, 03:08 PM
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Stop using ethenol which gets way worse gas mileage then regular gas. See if the smell disappears.

Does it smell like rotten eggs?
 
  #3  
Old 02-03-07, 04:11 PM
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It's not rotten eggs, it's something else.. it's really hard to describe. Just like it's burning/exhausting something other than regular gas exhaust.
 
  #4  
Old 02-03-07, 04:22 PM
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You might be burning excess oil. How have your oil levels been?

Try running a tank or two of regular gas, and see if it goes away.
 
  #5  
Old 02-03-07, 04:27 PM
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Oil burning hasn't been bad since we put in this Stop Smoke stuff. See I was wondering if the Stop Smoke stuff helped the seals and is slowly leaching into the cylinders instead of oil, and the van is burning that?
 
  #6  
Old 02-04-07, 11:10 AM
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In many parts of the U.S. the gas contains up to 10% Ethanol. It's posted on the pumps. Does the exhaust smell like rotton eggs? That could be a sign of a failing catalytic converter.
 
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Old 02-04-07, 11:19 AM
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No egg smell like I asker them earlier in the post.
 
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Old 02-04-07, 12:11 PM
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If you still have the Stop Smoke container put a few drops in a spoon and hold it over a burner on your stove to see if it gives off the same smell as it evaporates, it could be whatever is in Stop Smoke creating the odor. Have a nice one. Geo
 
  #9  
Old 02-04-07, 06:46 PM
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Could be your catalytic converter burning up. Are you running extra rich.
Also check the timing. if it is retarded it can do this.
I had an 87 same problem.
Is it the Mitsubishi motor ? and what size ?
 
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