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check for a leaking manifold gasket or cracked manifold. If it is a front wheel drive car there may be a flexible bit near the engine to allow the engine to move in the mounts . This bit of flexible exhaust is known to crack under the brading.
Take it to a muffler shop-that mechanic must have a tin ear. I thought my Sentra had a small exhaust leak (slightly loud exhaust noise) from a previously fixed exhaust connection. But a muffler shop guy showed me I had a rusted out catalytic converter. I would suspect your flex pipe may still be leaking.
There are many things that could cause that problem but yes the catalytic converter can cause that as well as the muffler or resonator if the car has one. A few ways that you can test that is; *place a vacuum gage on the intake manifold, start the engine and raise the rpm about 2000 rpm while noticing the engine vacuum. If the engine vacuum starts to drops, the exhaust more than likely has a restriction (could be catylytic converter/muffler/resonator). * take the exhaust loose before the catalytic converter and drive the car to see if it has power again even though it may be noisy. If the exhaust system is rusty, there is a good chance that the problem is in the exhaust system. If the exhaust system is not noisy or leaking try puttin your hand over the rear exhaust pipe to stop the exhaust from exiting; there should be a fairly strong push against the hand if the exhaust has no restriction and if it is restricted the push against your hand will be very light or minimum which could indicates an exhaust restriction.
Exhaust system has flexibility. When car is in reverse there is an opposite strain form the motor in relation to the exhaust system. A donut or join is opening and causing exhaust to leak out. Your exhaust also has a flex pipe to absorb movement between the engine and exhaust. This may be damaged from being "over flexed"
the bolt goes through the both flanges and the springs go against the last flange and under the nut of the bolt
it is a system that allows movement between the couplings so that the system doesn't crack from fatigue due to engine/ , pipe movement
There are several areas to check for possible exhaust leaks. i will list them below.
1. Exhaust manifold gaskets - This will be the most common area. There is a gasket that separates the block from the exhaust manifold. these gaskets can fail, thus, causing a exhaust leak at the manifold.
2. Lower manifold gasket(donut gasket) - This will be a possible leak spot as well. This small circular gasket is placed in between the upper exhaust pie and the lower side of the manifold. It basically separates the pipe from the exhaust manifold.
3. Exhaust pipe - The entire pipe can rust overtime, thus, creating small holes along the pipe structure. These holes will cause the exhaust to leak ,thus, filling the vehicle will moderate fumes and causing louder than normal engine sounds during revving.
4. Muffler - This component can also deteriorate to the point that it cannot filter out the noise. It will also cause leaks as well.
You will find the leak in one or all of the areas stated above in the list.
most likely (since it is not the muffler) is the donut where the ezhaust pipe hooks onto the exaust manifold....or the manifold cracked or needing a new gasket
Hi:
I am not sure what exhaust part you replaced, but you most likely still have an exhaust leak. There are donut seals that can wear out and crumble away, even though the piping appears good. The internal parts of a muffler can rot away, even if the out side looks good. tap on the muffler, and see if it rattles, and give the entire exhaust system a closer look. If you have someone that can help, start the car up after it is cold, and hold a rag over the end of the tail pipe, and see if the leaking are is more obvious.
Hi,welcome to fix ya.
usually the ones in the exhaust manifolds where the pipe attaches go bad . there is a metal sleeve that goes inside the donut be sure to use these or the donuts will burn out pretty fast. use a generous amount of penetrating oil on the bolts first they get pretty rusted on these .
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