Originally Posted by umoms
I have a 1996 Ford Thunderbird with 160k miles that I just bought. I am losing power while I give it gas. It only happens when I am driving. I lose power and the engine sounds like its bucking. I unplugged the MAFS and its still doing it. The air filter is brand new and I checked the fuel pressure its 29psi although it should be 30psi. I also tried a bottle of lucas and replaced the fuel filter. I also replaced the EVAP control valve. I just bought this car and no previous history on it.
I am also getting a check engine light P0420
I think it maybe the catalytic converter. I took it to a few muffler shops and they said there is no way for them to tell.
How can I be certain its the catalytic converter thats causing me to lose power?
Also can I use a catalytic converter from a 96 Tbird 6cylinder in my 8cylinder car? I notice they are different part numbers but look pretty much the same to me.
There is a sticky on the main Thunderbird subforum page, Check that for your OBDII codes, as far as the bucking/misfire, have you cleaned your MAF? Never hurts to go ahead and take care of that. It very well may be your cats, but instead of getting one that's gonna cost an arm and a leg, get a High-Flow cat. They sell on Ebay for around 50+ bucks. They are made for 8cyl, but they are pretty much generic. Before someone flames me, be sure you know who and what you're flaming for. I know my stuff as I have rebuilt my 95 bird from the ground up. Also check your o2 sensors, and as expensive as they are, you need to go ahead and buy all of them, get a pivot head wrench, (or just drop the exhaust) Do you have strict emissions rules? If not, gut the cats, and get/build a MIL eliminator. All you need to have to gut them is the proper tools to remove the exhaust from the manifold down, and a piece of re-bar or something of that nature. The rest should be self explanatory. Has your car had problems running lean? (pushing more gas than o2 and fire)? Mine had that problem and it caused a rather annoying and crippling carbon buildup that was oh so much fun
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