Calmchaos

Hello.
I am going to purchase a Cat and O2 becuase my current ones are shot to he||.
Is there anything I should know before purchase?

Can I order a Cat that has the pipe w/ the O2 sensor hole in it so that I dont have to remove the old one?

Thanks
-Brett

Calmchaos

Would the 1st Cat on this list be ok? Will it have the O2 port?
http://www.car-stuff.com/catalytic/q...1986&model=675

DLarsen

Burlington, New Jersey..............Hold off until April 22, The Porsche Swap Meet in Hershey, PA. Check it out. You may get lucky. My 86 944 na (275,000) still has the original cat. Even if you don't find a new one there; a used one that appears to be in good condition may save you lots of money. I personally would stay away from aftermarket units.

Calmchaos

I cant wait that long. I failed my inspection and need to get a O2 and Cat in good shape

Whats the OEM for the Cat in the 944?

DLarsen

Here's were I would look/shop:

Call Sunset Imports in Oregon. Porsche Dealership that discounts heavily on parts

Zims
Pelican
Vertex

Techno Duck

It will cost you an arm and a leg to have a stock cat sent to you..they are very heavy (60-70lbs).

Get any universal cat with a 2-inch inlet and outlet. Take it to a muffler shop and they will cut out the cold cat and weld in the new one. Dont bother getting an O2 sensor bung on the new cat, the stock location for the O2 sensor is inbetween the headers and cat. I would have the muffler shop replace the O2 sensor while they have it on a lift..makes it much easier to do.

nickg

a cat isn't gonna fiox your problem. pay a mechanic to FIX it. you are wasting time poking and hoping. when you replaced the afm...did you turn the screw? did you ohm out the CTS? did you bother to see what fuel pressure is? check for Vacum leaks? you failed because your car is running too rich.

Calmchaos

Screw WAS adjusted by a mechanic, the AFM was not replaced. And it was also checked for Vacuum leaks by a mechanic. I know that it is running too rich. The FPR was replaced and the car runs better and doesnt have as strong a smell of unburned fuel coming from the exhaust.

Small black debris is coming from the exhaust pipe and was told by a mechanic that the Cat was clogged. O2 sensor was also tested to not correctly read a rich mixture. (Voltage did not rapidly rise above .9V when mixture was enriched)

nickg

do the o2 first before anything else. is the idle loopy? disconnect the oxy senser and if it flattens out, there is the problem. the mechanic had no idea what he was doing if he adjusted the screw without verifying o2 senser function. you can't just turn screws.

nickg

also if the cat was clogged, it will sound like a rocket behind you(or jet like) If i was gonna buy a new cat, i would buy DEC brand as it is exactly like oe...don't buy the cheapy...they are smaller than stock and not too well made.

Calmchaos

My friend said that the car sounds like a plane, and it feels like the engine is under your butt.
And yes... agreed DEC is probably the best choice. I will be purchasing a DEC setup.
Thanks

nickg

i may have a used one, i will look tomorrow for you