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Cadillac Repair/1992 Eldorado blows out muffler


What could be wrong we replaced the cadillac converter 15 miles down the road the muffler blew, went back got another muffler it blew. I then gave up and drove it from Kentucky to texas with no problem except noise. Put another muffler on it it blew about 300 miles later. What could it be?


Why was the cat replaced in the first place? We need to look at the situation before you replaced the cat. Before putting the cat on you had no muffler problems correct?
For some reason back pressure in the exhaust changed, since you installed the cat.
Was the cat replaced because of lack of power or something else?
It sounds like there is a problem with the cat. Either defective, inferior not meeting factory specs, or the wrong catalytic converter.
I have run into problems using cheap aftermarket units and I realize the factory cats are very expensive, and to save money, we tend to go the aftermarket route. In man cases this is not a problem because I saved thousands on my Mercedes. Depending on the manufacturer and quality control is the difference between being problematic.
Let me know why the cat was replaced, and what you replaced the factory cat with.

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Rob Painter


Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?


Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

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