300E

There is also slufur like smell around the car and in side the car after being ran. Keep in mind that the car would run for a while at idle, but stop while under load. Isn't the 02 Sensor connected to the catalytic converter??? Now I am almost convinced that the exaust system is clogged at the catalytic converter...- All help is greatly appreciated- Chuck

Motor runs independently of the catalytic converters - unless the cats are blocked from the honeycomb being loose and plugging their exits. Usually, one hears a lot of rattling beforehand. CATS are expensive so don't jump at this unless you KNOW they need to be replaced. After market CATS are available for less $$.

Sulfur odor is from the fuel. Forget it, that's NOT the problem.

Are you telling us that after the fuel pressure regulator was installed the engine ran much longer but was noisy?

If so, then "the problem" is fixed and you need to replace some exhaust parts that are leaking and therefore noisy. First check the joints between pipe sections, then the pipes themselves and the muffler. There's an exhaust leak somewhere and that's creating the noise.

Why do you think its exhaust suddenly "smokes like crazy"? This is a new element.

Now it just seems like something is blocking the outflow of air from the motor. Its like a smoke that would look like a house fire smoke. Could the cat beheating up so much that this is the excess heat from the heat produced from the blockage in the cat. Again, if the car sits for a certain length of time it wil run fine. But for a while there has been this ratteling noise coming somewhere from underneath when excellerating. I saw i can get an aftermarket cat and pre-cats connected to eachother for about 350 bucks. I can most likley do this myself, but I was wondering since this is the original cat and pre cats, how hard it would be to line up since everything is "set in". The motor does have new motor mounts, so the front should be at the normal height.- CHuck

$350 is cheap... just buy it. It is fairly easy job... don't worry about lining it up...You just need someway to loosen the bolts...impact wrench would be the easiest. Get new O2 sensor if you don't have one already.

You can take it to your local small muffler shop... probably will charge you $60 to put it in.

For now what if I bypass the catalytic converter? Would this cause a problem with the 02 sensor? I just want to be sure it is the cat.-Chuck

You can do that too to test your theory without spending money.