Mechanics

ENGINE

1992 Lexus SC 300 • 6 cylinder 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


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Ianjames
April 2, 2011.



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).

Merlin2021
Apr 2, 2011.