03 Mountaineer AWD Premier V8 rattling noise under vehicle

Catilytic converter was stopped up , drilled holes , now it's ...

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Nov 19, 2015 - Catilytic converter was stopped up , drilled holes , now it's loud , runs better but overdrive doesn't work now - Cars & Trucks question. ... SOURCE: doesdrilling holes in a clogged catalytic converter help vehicle? ... Related Questions: ...Feb 20, 2014 ' 2002 Ford Expedition ... 11 people viewed this question ...

1999 ford expedition , 5.4 v8 , stopped up catalytic converter ...

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Nov 19, 2015 - 1999 ford expedition , 5.4 v8 , stopped up catalytic converter , drilled holes ... up catalytic converter , drilled holes , now it's loud and overdrive doesn't work now ... When catalytic converters go bad, the porcelain matrix inside comes loose and is noisy. ... Related Questions: ... 11 people viewed this question ...

comments on How to check your vehicle's catalytic converter.

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Wouldn't you want to plug the holes you drilled afterwards? .... I believe that the dealer is actually the one that doesn't know things that happen to your car. ... There are some who work at the dealership and are car fanatics who mess with their cars. ..... replaced battery, now someone told me sounds like a plugged convertor, ...

1998 Ford F150 4.6L with clogged cat - YouTube

Could be worn out timing chain guides

Listen with a stethoscope to the front motor cover

probably the heat shield around your catalytic converter has a few broken spot welds or an exhaust hanger is broken

it sound like your engine is lock up,

It is most likely an exhaust heat shield or a catalytic converter that is breaing apart inside. Get underthe van when it has cooled off and "thump" the exhaust with your fist to see if you can locate the rattle. Often, the heat shield welds break where they are attached to the catalytic converter. I have fixed many of them by taking 2 or 3 large screw-type hose clamps and screwing them together to make them long enough to reach all the way around the catalytic converter and tighten them down to stop the rattle. If the noise sounds like it is coming from INSIDE the converter, you will have to replace the catalyst. (or ignore the noise)

Check the heat shield around the catalytic converter.

V8 version is an AWD.

Is it possible something caught on the main axle.

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If it is the heat shield , any muffler shop can put a couple of welds on it. Could also be that the cat converter is destroyed inside with pieces of it ratling around. In that cast a new cat is the only answer.

There is a TSB reference number 96-26-12 for torque converter replacement

your converter has broke down inside this will effect gas millage and could clog up the exhaust and kill your performance.