![]() If the filter is dirty or clogged, it should be replaced as soon as possible to ensure proper engine performance. If you are experiencing issues with fuel delivery, check the condition of the fuel filter or your fuel pressure. Installing a new fuel filter or a fuel strainer can help keep debris out of your fuel lines and the rest of your fuel delivery system. Not only can a clogged fuel filter cause a decline in performance, but it can also lead to low fuel pressure and a lean fuel mixture, or even a complete inability to start the engine. A failing or clogged fuel filter restricts the flow of fuel, resulting in sluggish acceleration, a rough idle, stalling, misfires, and more. A vehicle's fuel filter can become clogged with time due to dirty or contaminated fuel, dirt, or rust from the fuel tank or fuel lines. Your fuel filter also prevents your fuel injectors or carburetor jets from becoming clogged and helps with overall engine performance. Fuel filters are typically found between your fuel pump and fuel inlet, or may be installed on the fuel pump or in the fuel line. 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 to fix.Understand The Symptoms Of A Bad Fuel FilterÄesigned to contain and eliminate sediment, scale, and debris from fuel, a fuel filter uses a screen or filter to ensure your engine is receiving clean fuel. 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. 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. I know my stuff as I have rebuilt my 95 bird from the ground up. Before someone flames me, be sure you know who and what you're flaming for. They are made for 8cyl, but they are pretty much generic. 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. 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. Many manufacturers give a five year, unlimited mileage warranty on these items. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. ![]() One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. Inspect the downstream heated oxygen sensor (HO2), replace if necessary.The waveform of the sensor behind the converter should be more steady). Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform.Check for exhaust leaks at the manifold, pipes, catalytic converter.Some suggested steps for troubleshooting a P0420 code include: The oxygen sensors in front and behind the converter are reporting too similar of readings.Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe.The engine coolant temperature sensor is not working properly.An oxygen sensor is not reading (functioning) properly.Leaded fuel was used where unleaded was called for.A code P0420 may mean that one or more of the following has happened:
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