I recently had a new catalytic converter and exhaust system installed so what problem could this be?
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Use a mixture of warm water, liquid dish soap and baking soda. It works wonders.
5W30 would be advantageous. continually use the comparable oil, type, grade, etc. the only human beings i comprehend who've had lubrication themes replaced oils - relatively %. one, and carry on with it. replace the oil and filter out generally. in case you do not comprehend what became used before, decide on your oil and filter out, replace it, force under a hundred miles, and alter it lower back. this could flush out the gunk. the difficulty is a few oil's chemistry's react with others in a bad way.
You could have an exhaust leak in front of the cat. This could be at the block (header) or one of the connections made to install the new parts (as in a bad weld or loose clamp). So take it back to the shop that did the work, as I suspect that either the workmanship was not up to snuff or they just did not do the job right.
Even though you just had you exhaust work done, it is likely you got a low cost catalytic converter. Or you could need your O2 sensors replaced. There is usually 2 on on all exhaust systems from cars in the 90's up to now. They can range in price from 30 to 150 each. One is before the catalytic converter and there is one after the catalytic converter. These sensors control fuel mixture by reading the flow and gases that remain before and after the catalytic. There are strict requirements where to place these sensors in the exhaust steam especially in CA. Any changes must be corrected in the computer. Some small shops are not aware of the this detail. Bottom line your car should still run fine, but since is says you have reduced flow, you probably notice you have reduced power. If this concerns you then you should go back to the shop where you had the work done and request it be corrected. You had to sign a contract when you had the work completed so before embarrassing your self, check the detail referring to o2 replacement and catalyst quality and pricing. You will probably have to spend a little bit more money. Before having any work done have them plug you in to the engine diagnostic computer. That usually narrows it down to the exact part at fault in this case.
