Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
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This sounds like a fault with a restriction in the catalytic converter.The catalytic converter will restrict internally causing this fault here needing replaced.It causes the engine to sound like it is working hard or roaring but the vehicle will be sluggish.
What needs to be done is to have an exhaust back pressure test done to see if the back pressure exceeds 1.5 psi at any time.If it does then the catalytic converter itself is at fault needing replaced to resolve this issue.You can usually rent a back pressure tester from a local parts store and thread it into the pre catalytic converter oxygen sensor port.Then run the engine from idle to wide open throttle briefly.If the back pressure exceeds 1.5 psi then the catalytic converter needs replaced.
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