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Smog Pump vs. Fuel Economy

Discussion in 'Under the Hood' started by imp, June 18, 2017.

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    1. imp

      imp Well-Known Member

      November 12, 2009
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      City, State:
      Missouri Ozarks
      Year, Model & Trim Level:
      2004 XLT
      My recently bought '94 vehicle (5.0L HO) has had it's smog pump bypassed using a shorter drive belt. The air diverter valve has been removed, but both check valves are still present.

      My question is, aside from emissions violation (no test or inspection in my location), how would operation without the smog pump affect fuel economy?

      Would it be recommended that I put it back in service?

      Consequences to the engine from operating without it, if any?

      Thanks for any thoughts! imp
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    3. boominXplorer

      boominXplorer Elite Ranger Elite Explorer

      September 16, 2002
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      City, State:
      Virginia Beach, Va
      Year, Model & Trim Level:
      00 4x4 Mounty
      Think of it as a belt driven high volume air pump that puts clean air into the exhaust to make the emissions reading out the tailpipe lower. It doesn't affect the engine performance in any way and bypassing it is almost like bypassing an a/c compressor that's on all the time.
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