Help!

[Jacob]

I think my exhaust is backing up slowly or something how do I check?

[Pu241]

First off why do you think this?

Unbolt the front and back part of the Cat converter.
AFTER use of PB blaster otherwise you will snap the studs off of the Cat and you will have a problem.
Use of an impact wrench is highly recommended.
Once you have it out, see if you can look through the ceramic matrix which is the support for the catalytic metals that do the actual chemical conversion of the exhaust gases. The holes are not very wide but all should be unobstructed.
You might need a pretty bright light at the opposite end your looking from to get a good look at all the channels.

More info on the issue your having with the vehicle can only help us help you!

[WmWatt]

For one way look at the permanent article on using a vaccum guage to diagnose engine problems at the top of the forum.

[CharlieZ]

With a vacuum gauge, you can easily find out if your catalytic converter has a blockage. Attach the gauge to the intake manifold. There is intake vacuum inside the manifold that your gauge will check for pressure. Other points where you can attach the vacuum gauge are the carburetor and throttle body. Intake vacuum is created in the intake manifold because of the pressure discrepancy from the pumping of the engine’s pistons and the restriction from the throttle valve. Get the pressure reading on the gauge when the engine is idle. Then, increase the engine speed to about 2,500 and keep it at that speed. When you first release the throttle, the gauge pointer will fall fast but it will go back up and should remain steady at some point. If it drops again after rising, the exhaust system may be building up back pressure.

http://www.howtodothings.com/automotive/how-to-check-out-your-cars-catalytic-converter-for-blockage

[Jacob]

Thx will work & let u know

[beertap]

Another way to check for back pressure is to remove the O2 sensor and install a pressure gauge into the port.

[Bathtub Tom]

My back box collapsed internally. It was reluctant to rev over 5K and the sound was more a constant pfffffffff rather than a pft, pft, pft. I took the box off and went 'fishing' with a bit of bent wire, it took over half-an-hour to get it all out. Surprisingly, it's not noticeably louder.

http://i353.photobucket.com/albums/r370/bathtubtom/S6300469.jpg

[CharlieZ]

^^^ Darn, so THAT'S where my little Yorkie was hiding! LOL