brokebill Posted February 22, 2008 Share Posted February 22, 2008 time to do some quickie exhaust work. front catalytic converter seems fine. from the second catalytic converter(or resonator?) back it all needs to go. the second converter has a hose running into it and a sensor plug . can i do away with second converter and just run straight pipe? what about the rubber hose and sensor? thanks ---------------------------------------- ok, got back under the car today and i can reuse the back conveter. just need to punch screen out of it. how necessary is that oxygen sensor in it? and that rubber hose? never did much exhaust and i'm working on 2 different cars at the same time. HELP!!! Link to comment Share on other sites More sharing options...
MilesFox Posted February 23, 2008 Share Posted February 23, 2008 follow the rubber hose up to the back of the motor and unplug them, cap off teh ports the hoses connect to with a piece of rubber inner tube and a hose clamp you can eliminate the whole mess if you can find a plug for the exhaust port. the rest of it just bolts to a bracket on the back of the head. you can make a block-off plate or just weld some random bolt to the end of the chopped tubing but yes, it can be eliminated and later models exhasts will fit the same. ask for a 94 loyale unless they are making one from scratch. if that's the case have a 2 inch cherry bomb in place of the resonator and do away with the muffler, turn the timing up to 10 or 12 deg Link to comment Share on other sites More sharing options...
Skip Posted February 23, 2008 Share Posted February 23, 2008 Hi Bill, would you care to enlighten us as to the car year fuel system state it was manuf. for this little help to us may in turn help us help you as you asked us for help Link to comment Share on other sites More sharing options...
brokebill Posted February 23, 2008 Author Share Posted February 23, 2008 this is my 86 carbed. not sure the state of manufacture. my other project is my crown vic which i'm changing to duals.( There is an excellent forum if anyone here has a crown vic or grand marquis. just pm me if you need details) a flange gasket and long screwdriver and i can reuse my back converter and leave hose and oxy. sensor in place. im pretty sure the oxy. sensor is bad(from info in old threads) should i just replace with the cheapest generic? thanks again all. Link to comment Share on other sites More sharing options...
Skip Posted February 23, 2008 Share Posted February 23, 2008 from this info and the fact the car is NOT 4wd it can be gleaned this car has an ECU and a feedback carb. If you eliminate the 02 you would also have to make some changes to the carb as the ECU would have no A/F reference voltage. A generic < 20 $ Bosch 02 sensor can be used. I am sorry I know not about the "rubber" hose to a cat?? Seems pretty hot for a rubber tube. We need GD or Gloyale to spell this one out. It could be the air injection tube to provide 02 to the cat to complete the unburned hydrocarbon combustion. A newer cat could be fitted eliminating this necessity. Link to comment Share on other sites More sharing options...
brokebill Posted February 23, 2008 Author Share Posted February 23, 2008 pics would definately help yall help me. (a compatable memory card reader is in the budget) as i've mentioned about my car before, it has underwent some real backyard mystery modifications before i got it and the exhaust is no exception. the second converter has maybe a foot of pipe on the back of it and just sits in a bigger pipe that makes up the rest of the exhaust. no clamp or anything. Dont see how any exhaust ever made it all the way to the end of the tailpipe. Link to comment Share on other sites More sharing options...
Skip Posted February 23, 2008 Share Posted February 23, 2008 sorry Bill I do not mean to be rude but some of us folks don't get a chance to read every other post, posted by posters. Or remember for that matter as some of us have "senior monents" (speaking for myself here). Thus the more info one can give at the time of posting a "new" or different problem helps us help you.. Link to comment Share on other sites More sharing options...
brokebill Posted February 23, 2008 Author Share Posted February 23, 2008 i know a lot of people come through, but with the personalized help i get it feels like yall do actually know my car. appreciate you all. oxy sensor part #11027 the one? thanks again Link to comment Share on other sites More sharing options...
Gloyale Posted February 24, 2008 Share Posted February 24, 2008 The rubber hose feeds the Air Suction Valve. If you're replacing the CAT, it can be removed. Just trace it up to it's origins in the engine bay. Cut and plug it. The ports on the heads will still supply the ASV. The whole ASV system can be eliminated actually, but the easiest thing to do for now would be cap it. Or actually just leave it if you're not replacing the cat and it's not leaking or broken. There should not be an Oxygen sensor in the second cat. The only O2 sensor should be in the front cat, between the arm of the *Y* piece. The dual jacket pipe is just for noise reduction and corrosion protection. The bigger pipe is just sleeved over the inner. to run you're new pipe, use a size just slighlty bigger than the inner pipe. Sleeve it between the 2 layers, over the inner, but inside the outer. Then clamp and/ or weld. Works well, I did this on an 86 Carbed 2wd sedan. Link to comment Share on other sites More sharing options...
GeneralDisorder Posted February 24, 2008 Share Posted February 24, 2008 To my knowledge Subaru never used that style cat with the air injection tube running into the side of it. That was mostly used on cars equipped with smog pumps. Subaru's system was to inject air into ports built into the heads right above the exhaust flange (on EA82's). I would say you have someone's attempt at plumbing in an aftermarket 2nd cat to pass some inspection when they found it expensive and difficult to replace the built-in cat contained in the y-pipe. Their solution (a valid one) was to add a second "universal" cat. They just used one that had the AIS port and figured a way to hook it in I suppose. Sounds ghetto - I would yank it out if it were me. Chances are good that if it wasn't done right it could cause more problems than it's worth. GD Link to comment Share on other sites More sharing options...
brokebill Posted February 24, 2008 Author Share Posted February 24, 2008 you are correct Gloyale. i was under there today again and the back has just the hose. i had everything loose from the manifold back and the oxy sensor is in the front converter. Just blended together in my tired mind. running it unhooked right now right before second converter. is loud as hell, but also seems to have less power this way. Maybe not enough backpressure? Link to comment Share on other sites More sharing options...
GeneralDisorder Posted February 24, 2008 Share Posted February 24, 2008 brokebill said: running it unhooked right now right before second converter. is loud as hell, but also seems to have less power this way. Maybe not enough backpressure? Maybe. But most of your scavenging comes from the headers (y-pipe) itself. It's usually not a problem to go with larger pipe or no pipe after the first cat. At least it's never really affected any of the one's I've run that way. Perhaps your y-pipe is leaky. Do you get backfireing at times? That's indicative of a working AIS and a leaky y-pipe. Too much fresh oxygen combines with unburnt fuel and often ignites in the muffler. GD Link to comment Share on other sites More sharing options...
brokebill Posted February 24, 2008 Author Share Posted February 24, 2008 and you are correct also GD . this car has a lot of ghetto fixes. could have spent a couple years in mexico! Link to comment Share on other sites More sharing options...
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