Question about 2001 Chevrolet Impala
That hole is not big enough to relieve the back pressure if your catalytic convertor is restricted.the best way to tell is by using a backpressure gauge installed where the front oxygen sensor is located.pressure should be under 1-2 psi under heavy acceleration.The front oxygen sensor is in the exhaust manifold on the back side of the engine.
Posted on Apr 14, 2014
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Posted on Jan 02, 2017
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