• Tiny
  • ianjames
  • 1992 Lexus SC 300
  • 6 CYL
  • manual
  • 200,000 miles

I have a92 lexus sc 300 and it has a muffle sound when start the engine and it start heasate when excellarete gas do you have any idea whats going on

Saturday, April 2nd, 2011 AT 8:33 PM

1 Answer

  • Tiny
  • merlin2021
  • Expert
  • 17,583 posts

Several things can do it, low fuel pump pressure, tune up, clogged exhaust. Check fuel pressure with a gauge. Check for exhaust blockage with vacuum gauge. Hook up to manifold raise rpm to 2000, gauge should remain steady if it drops, exhaust is clogged (converter).

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Saturday, April 2nd, 2011 AT 10:01 PM

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