Told have to replace exhaust system and catalytic converter.
Car sounds rough and has for a while now. went to dealership told that complete exhaust system needs replacement at cost of $1400. is this a common problem? Why so soon if the exhaust system are supposedly stainless steel?
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Re: told have to replace exhaust system and catalytic...
I have NEVER heard of this Before! It sounds like to me that they are trying to take you to the Cleaners! I have been an ASE Certified Mechanic for 35 Years and would NEVER Replace the Exhaust unless it was an Upgrade or Totally Rusted out.
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Bad Oxygen sensor. Possibly _also_ bad catalytic converter. If less than (roughly) 70,000 miles, the converter is likely good. But your symptoms are 100% consistent with a bad oxygen sensor (which are sometimes attached directly to the catalytic converter). // Note: If you do need a catalytic converter, have it done at the Dealership. The ''muffler shops'' will install a generic (probably ''ceramic'') replacement, which could adversely affect performance, gas mileage, and _definitely_ not last more than a few years.
Your catalytic converter is exactly what it says it is. It converts undesirable exhaust gases into acceptable ones by using a catalyst to combine the unburnt hydrocarbons with a second element. It uses the heat of your exhaust to do this. However, as the process goes on, the converter absorbs more and more impurities but expels nothing except what is left in your exhaust. This means your catalytic converter finally fills up. After 10 years, it sounds like your converter has reached the end of its life and is full. Hence exhaust gases are having trouble passing through it. It is now being overheated by the exhaust gas that cant flow freely. This is also creating back pressure in your exhaust manifold thus interfering with your engine's performance. You have to replace the catalytic converter. Probable cost about $400 to $500.
The cat converter is breaking up inside, blocking some gas flow, causing it to heat itself. May eventually block it enough to cause rough running or completely shutting the truck down. No repairs are possible. It must be replaced. Most people just remove it & put a straight pipe in its place. But that's illegal. And you didn't hear that from me. Well, who looks under a 26 year old truck?
From the engine, you have manifolds coming out the side of the engine. It will probably look a little rusty. The manifold is the first part of the exhaust system. After the manifold, you will have pipe running below the car. the pipe is bolted to the manifold. After the pipe there will be a larger portion of the exhaust. Kind of an oval shape pipe. Probably roughly 12" long. The catalytic converter gets VERY hot, so let the car cool completely before touching.
I had a chevrolet cavalier once that had a clogged exhaust. i was driving and the catalytic converter fell apart, and clogged the exhaust system. I completely lost power, and barely got home. Try getting your arm under the car, and hit the catalytic converter with your had, or a mallet. If it has fallen apart and failed, you should hear a clattering sound. Try inspecting the whole exhaust system, looking for bends in the exhaust pipes. When my catalytic converter failed, i also heard a hissing sound when it was running, and the engine was slightly overheating because of the restriction in the exhaust. !!GOOD LUCK!! Matt
Low power ND ROUGH IDLE, BUT, CHECK THE EXHAUST AT TAILPIPE FOR ROTTEN EGG SMELL, NO [RESSURE OR DIFTING EXHAUST, USING A PIECE OF TISSUE. tURN ENGINE OFF AND LISTEN FOR WHEEZING AND exhaut not stopping immediately when is shut ogff. All signs of a restricted converter.
Catalytic Converter Failure is a common cause of a P0420 Code. 1.) I would give a few calls to some muffler shops and get a thorough exhaust inspection done. As a leaking/damaged Exhaust Manifold, Catalytic Converter, or exhaust pipe could be some of the culprits as well. If it were any of those other items your car would give you a different OBD Code. Item #2.) This is not common with a P0420 Code. With the P0420 code you should have no driveability issues. (not to say that you wouldnt in an extreme rarety) Item #3.) Again this would flag an entirely different code such as P0455 (Large Evap Emission Leak) Item#4.) Engine Oil would not even set a code. I hope this helps you out, and thank you for using FixYa!