Sounds like your front cat is plugged or your running lean, overheating is a sure sign of both. I've never heard of an out of tune carb killing a cat, but what usually does is things like carb cleaner or shooting brakeleen down the intake.
Have you used carbcleaner on it?
Are you running it lean right now?
Do you have any running issues like an idle that stumbles?
What do your spark plugs look like?
--What does your exhaust smell like? --
a metalic, burning, rotten egg smell is typical of a dead cat
Do you need to pass emmisions?
Try taking the rear cat off and take it for a drive, its probably fine and has a loose heat shield, but this would rule it out. It won't hurt anything, it will just be loud, so watch out for cops. If you do notice a big increase in power you might have found your problem.
Let us know what you find.
Wow, I'm sorry I forgot to mention another "symptom" of off-tune besides weak/low power.
Everyday, on my first start, I have to pump the gas two or three times for an effective start.
Once she is warmed up, it starts normally.
But if not, even a second start needs some gas.
I have a muffler, so no cats isn't too big of a deal for me. Cops are cool around me, had a 2.5L Sentra with a 3.5" catback exhaust and was never bothered with.
My plan is to either replace the O2 sensor, or if the cats are failed I will straight up cut them out for now.
I passed emissions in Dec. 13' with FLYING colors, better than my '02 car.
I have had a rattly guard *before on a different car*, but as I was working on the CV shaft with my car on a lift, my mechanic buddy knocked about the rear cat and in his opinion it was failing/crumbling. I can imagine he would notice if it was the guard instead.
let's say the rear cat is toast, then the front could just be suffocating. It almost sounds like gas is trying to escape from that area on hard acceleration.
I will check the plugs,
the only thing I sprayed through the carb was a good amount of starter fluid (note, it didn't need it. I have a faulty gas level gauge :/ That was embarassing lol). This was in November/early December.
I made sure I bought the starter fluid with lubricant.
I'll check the exhaust smell.
Besides the rough cold start, it idles well but I have instances of putting down the gas (pedal) and I will get *rev+accelerating* more gas pedal *rev and stagnant acceleration, just more revs and more noise*. My clutch is good, and this is what I mean by weak power.
At other times, oh man it powers through just fine and I even manage to overtake someone. The boxer growl reminds me of our 3.6L Outback at full throttle . I have to note, that I don't believe in coincidences and I took my car to the car wash recently. As I left I made a flawless getaway. The water cooled Something down
Edited by SnatchedHatch, 13 February 2014 - 09:46 PM.