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I am scheduled to have both my cats replaced because the left side cat has gone bad. I am replacing both sides with hyperflow cats.
My mechanic now refuses to replace the damaged side cat without replacing the exhaust manifold, due to the last customer he had where he had replaced the cat only to have it fail again due to a leaky exhaust manifold. It is possible that a cracked manifold can send more air into the 02 sensor thus causing the fuel mixture to be richer, thus more unignited fuel into the cats which damage the cats.
I asked him if a leakdown test would give any indication of a leaky manifold, since I had one performed prior to purchase last year. He responded that the leakdown test just encompass the internal parts of the combustion area, anything past the exhaust valves are anyones guess or careful inspection.
Now I am faced with an additional expense of replacing the one side manifold on top of the cats.
Any insight on this, or suggestions. I need some more info before giving the OK. This expense had put a huge dent on my budget this year
My mechanic now refuses to replace the damaged side cat without replacing the exhaust manifold, due to the last customer he had where he had replaced the cat only to have it fail again due to a leaky exhaust manifold. It is possible that a cracked manifold can send more air into the 02 sensor thus causing the fuel mixture to be richer, thus more unignited fuel into the cats which damage the cats.
I asked him if a leakdown test would give any indication of a leaky manifold, since I had one performed prior to purchase last year. He responded that the leakdown test just encompass the internal parts of the combustion area, anything past the exhaust valves are anyones guess or careful inspection.
Now I am faced with an additional expense of replacing the one side manifold on top of the cats.
Any insight on this, or suggestions. I need some more info before giving the OK. This expense had put a huge dent on my budget this year