So, I'm officially pissed. Finally, after months of replacing, and gettin' the new engine in, and blah blah blah. Okay, so..I have a post around here somewhere about this problem, but...definitely didn't get any help. And before someone tells me to get a Haynes manual.....I honestly don't think this problems in that book. Sorry. 
Well, I bought this catalytic converter about....hrm..2 months ago? Before I put this damn thing on, my car ran fine. I haven't had a thermostat in it since March. (still solvin' the problem there), but either way...without that thermostat, in March....it was kinda chilly here. Car never really got over 1/3 on the temp. gauge. Went to Fairfax Virginia in May, and all kinds of stuff. 300 freakin' miles to the tank. Before I went to fairfax (290 miles), I was throwing a CEL for the o2 sensor. So, got a new one. Bosch, yea...heard about them, but hell.....it worked at the time. To and From fairfax, decent gas mileage without a thermostat. Half the trip was Mountain backroads, all the way to the Va line. (about 130-140 miles). When I got home, few days later, went to the exhaust shop and got my exhaust redone. My exhaust was 2 1/4" straight back to an apexi n1 muffler. Loud, yes. I got a Catalytic Converter put on, and a Turbo Performance Muffler put on. They just cut the piping I had (which they put in last June), welded the Cat on, and the muffler. Now, right after getting that done. I get 200 miles to my gas tank....highway. I go to Pa every weekend. It's KILLING me. Right when that catalytic was put on, that's when it threw a code for the o2 sensor heater circuit in the Bosch sensor. BUT, the CEL would come on when I first started it, I'd turn it off....and start it back up, gone. No CEL. Finally, killed the o2 sensor itself. Found my old o2 sensor from the old engine (that was still good), in my trunk. Rewired it, it worked for a few days. Was on my way to Pa, heater circuit again. By the time I got to Pa, Heater circuit, o2 sensor, FUEL SUPPLY. Now, I just recently got my Denso o2 sensor. Plugged up, been to pa twice with this bad boy, not oneeeeeee CEL. Still, 200 miles to the tank. My car takes a second to move. It hesitates. I've got a short-ram intake. Even with a straight back exhaust, with no back-pressure, I got WAY better take off and throttle response than I do now. When I start the car, you can smell the gas near the engine, and under the car.....but can't really smell much when you're at the back of the car? hrm....isn't that where the exhaust is supposed to go? Out the muffler? I put a tip on my muffler last weekend. Now, it's got black on it. So, the exhaust is gettin' through. Just seems like it's straining. The car drives like it's backed up now. Like....I'm pulling a trailer. Only when the car's warm though. Right when I take off, car's cool....it moves normally. My step-dad tries to say it's my thermostat....but in 80 degree weather (what it is now), my car gets warm in about 10 minutes. Needles in the center of the gauge. I go to get on the highway, boom. Overdrive kicks in. On my way TO and FROM fairfax, without a thermostat on an Automatic, if the car senses it's running cold, it won't kick into Overdrive. I didn't have Overdrive to or from fairfax. 4,000rpms down the highway at 75-80mph. STILL got 300 to the tank. I've changed the spark plugs what....twice month? Just cause I thought that'd be the reason for the bog in Overdrive. Any other time my car's bogged (2 times since I've had it over a year), it was the spark plugs. And Also, I've got black stuff on my valve cover? Exhaust has made it's way OUT of my header where it's welded to the piece that bolts to the block. All of this, is why I'd think it was my catalytic converter. It pretty much killed 2 o2 sensors. I hope it doesn't kill this one? Paid 85 dollars for this damn thing. I'ma go to the exhaust shop tomorrow, and get this Catalytic gutted. I'ma see if they can make the ends wider, gutt it out, and put a straight pipe through it, just so...ya know, cop looks underneath the car (as they've done before IN FAIRFAX), they'll see a cat and just be like.....shucks. If anyone agree's that it's the catalytic, let me know. If you think it'd be something else, lemme know. I haven't done a modification to this car, except for the butterfly delete, which was after the 3rd time I've already went to Pa and got the 200 miles to the tank. I even bought a new filter for the short-ram Friday night, while I was in Pa. All of my tires have been at 38psi for about a month now. (they were actually lower durin' the Fairfax trip). That's about as specific as I can get. 
Well, I bought this catalytic converter about....hrm..2 months ago? Before I put this damn thing on, my car ran fine. I haven't had a thermostat in it since March. (still solvin' the problem there), but either way...without that thermostat, in March....it was kinda chilly here. Car never really got over 1/3 on the temp. gauge. Went to Fairfax Virginia in May, and all kinds of stuff. 300 freakin' miles to the tank. Before I went to fairfax (290 miles), I was throwing a CEL for the o2 sensor. So, got a new one. Bosch, yea...heard about them, but hell.....it worked at the time. To and From fairfax, decent gas mileage without a thermostat. Half the trip was Mountain backroads, all the way to the Va line. (about 130-140 miles). When I got home, few days later, went to the exhaust shop and got my exhaust redone. My exhaust was 2 1/4" straight back to an apexi n1 muffler. Loud, yes. I got a Catalytic Converter put on, and a Turbo Performance Muffler put on. They just cut the piping I had (which they put in last June), welded the Cat on, and the muffler. Now, right after getting that done. I get 200 miles to my gas tank....highway. I go to Pa every weekend. It's KILLING me. Right when that catalytic was put on, that's when it threw a code for the o2 sensor heater circuit in the Bosch sensor. BUT, the CEL would come on when I first started it, I'd turn it off....and start it back up, gone. No CEL. Finally, killed the o2 sensor itself. Found my old o2 sensor from the old engine (that was still good), in my trunk. Rewired it, it worked for a few days. Was on my way to Pa, heater circuit again. By the time I got to Pa, Heater circuit, o2 sensor, FUEL SUPPLY. Now, I just recently got my Denso o2 sensor. Plugged up, been to pa twice with this bad boy, not oneeeeeee CEL. Still, 200 miles to the tank. My car takes a second to move. It hesitates. I've got a short-ram intake. Even with a straight back exhaust, with no back-pressure, I got WAY better take off and throttle response than I do now. When I start the car, you can smell the gas near the engine, and under the car.....but can't really smell much when you're at the back of the car? hrm....isn't that where the exhaust is supposed to go? Out the muffler? I put a tip on my muffler last weekend. Now, it's got black on it. So, the exhaust is gettin' through. Just seems like it's straining. The car drives like it's backed up now. Like....I'm pulling a trailer. Only when the car's warm though. Right when I take off, car's cool....it moves normally. My step-dad tries to say it's my thermostat....but in 80 degree weather (what it is now), my car gets warm in about 10 minutes. Needles in the center of the gauge. I go to get on the highway, boom. Overdrive kicks in. On my way TO and FROM fairfax, without a thermostat on an Automatic, if the car senses it's running cold, it won't kick into Overdrive. I didn't have Overdrive to or from fairfax. 4,000rpms down the highway at 75-80mph. STILL got 300 to the tank. I've changed the spark plugs what....twice month? Just cause I thought that'd be the reason for the bog in Overdrive. Any other time my car's bogged (2 times since I've had it over a year), it was the spark plugs. And Also, I've got black stuff on my valve cover? Exhaust has made it's way OUT of my header where it's welded to the piece that bolts to the block. All of this, is why I'd think it was my catalytic converter. It pretty much killed 2 o2 sensors. I hope it doesn't kill this one? Paid 85 dollars for this damn thing. I'ma go to the exhaust shop tomorrow, and get this Catalytic gutted. I'ma see if they can make the ends wider, gutt it out, and put a straight pipe through it, just so...ya know, cop looks underneath the car (as they've done before IN FAIRFAX), they'll see a cat and just be like.....shucks. If anyone agree's that it's the catalytic, let me know. If you think it'd be something else, lemme know. I haven't done a modification to this car, except for the butterfly delete, which was after the 3rd time I've already went to Pa and got the 200 miles to the tank. I even bought a new filter for the short-ram Friday night, while I was in Pa. All of my tires have been at 38psi for about a month now. (they were actually lower durin' the Fairfax trip). That's about as specific as I can get.
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