Question about 2003 Mitsubishi Lancer

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My catalytic converter seems stopped up, but it looks to be more than one. Which one on the pipe is the converter.

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YOU HAVE TWO CATALYTIC CONVERTERS A PRIMARY AND SECONDARY WHICH LOCATED IN THE MIDDLE OF EXHAUST. YOU HAVE TO SCAN CAR TO SEE WHICH ONE READING BAD.TO ME I WOULD REPLACE BOTH .NOT GOING TO BE A CHEAP FIX.

Posted on Jun 06, 2010

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If you have a plugged catalytic converter, it would cause performance issues and generally would glow red and would be real easy to tell. The cats are right outside the engine under the car and the muffler is more nearest the back of the vehicle. The engine that this car uses may use a "pre cat" which on the old models would be the first to plug and is attatched directly to the exhaust manifold. Let me know what you see and I will help as much as possible.

Posted on Jun 06, 2010

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2007 dodge magnum 3.5L, downstream o2 sensor location? picture or diagram?


Should be in the exhaust pipe just after the catalytic converter.

Feb 19, 2015 | Dodge Cars & Trucks

1 Answer

How di I replace a catalytic convertor


Replacing a catalytic converter ranges from easy to moderate for most DIY mechanics. It is best to take off the entire exhaust system (not the exhaust manifold or headers) for a through inspection when doing this job as a bad catalytic converter is a sign that other parts of the exhaust system may be requiring replacement as well including the muffler(s) and tail pipe(s). Tenneco's Walker Muffler site has detailed schematics for both domestic and foreign cars. TRW Aftermarket may carry them too. (If you own a very expensive car; you plan on keeping for a long time , see about a stainless steel exhaust system... Borla, Remus, Supersprint, Bosal, and ANSA make many for foreign cars.) The other thing(s) to check and remove before taking the exhaust pipes off are the 1 or 2 Oxygen sensors... they will affect your gas mileage significantly. Unplug the wires to them and unscrew the front one and look at it. If it's filthy fouled replace it and the lower (if there are 2) one too... the information from both of them influences the car's ECM/ECU computer to adjust the air/fuel mixture.. (NGK, Beru, and Bosch make oxygen sensors for most cars.) Ensure you buy new exhaust pipe hangers and mounting bolts, if your hangers don't include them. Use Penetrating oil on a COLD exhaust system to help free up the bolts that join the lower part of the exhaust manifold to the first part of the exhaust system. Letting it sit overnight seems to work best. You may need a new gasket there so prepare and buy a new one to replace it. (When replacing, tight is good, too tight is bad as you may break off the stud or bolt.) IMPORTANT!!! Old catalytic converters need to be disposed of as hazardous waste as they contain several gridded wafers of electroplated platinum base metal. (Contact the new catalytic converter seller to see if they will take your old one or contact your city or county disposal office to see how to properly dispose of a used one.) Exhaust pipes typically fail where there are bends as the metal is stretched and thinner there... look for holes and rust. Typically, a ratchet set, rubber mallet and hacksaw may be required to cut a catalytic converter out and then crush the round inner sleeve remaining inside the exhaust pipes ends with a thin flat chisel, pulling it out of the "good" exhaust pipes using locking pliers (a.k.a. Vise Grips tm). (Alternatively, a rubber mallet may be used to strike the catalytic converter to break it loose from the exhaust pipe ends... DO NOT DO THIS if the catalytic converter is in the disintegration stage. Do Not use the mallet on the exhaust pipes as they will bend!) Use crocus cloth or sand paper to smooth the inside of the exhaust pipe connections and ensure by trial off the car that the new catalytic converter goes in the pipe ends easily before mounting the separate pieces on the car... terrible to learn it won't go in, due to carbon soot or rust when you're on your back underneath!

Oct 13, 2014 | 1999 Dodge Grand Caravan

2 Answers

What would be causing what sulfur smelling exhaust smoke?


The Smell is-- Sulfur Dioxide-- from an over heated
Exhaust Converter

Yes-- it will be ruined soon

White Smoke all the time, could be a head gasket

It could also be-- lots of fuel-- that is overheating the converter

Have to look at fuel trim on scan tool data

Aug 23, 2014 | 2012 Ford Fusion S Sedan 2.5L 4-cyl....

1 Answer

Diagram of o2 sensor location on a 93 Nissan d21


There really is no diagram.. The upstream O2 is in the exhaust manifold or pipe before the catalytic converter and the downstream O2 (if equipped) is after the catalytic converter in the Catalytic converter itself or the pipe just after the Catalytic converter.

Apr 27, 2014 | Cars & Trucks

1 Answer

What are the torque specs for 1996 Buick Century 3.1 L intake manifold?


Front Pipe REMOVAL & INSTALLATION Pipe Without Catalytic Converter
  1. Before removing any component of the exhaust system, always squirt a liquid rust dissolving agent onto the fasteners for ease of removal..
  2. Raise and support the front of the vehicle on jackstands.
  3. Remove the exhaust pipe-to-manifold nuts.
  4. Support the catalytic converter, then disconnect the pipe from the converter. Remove the pipe.
  5. Remove the exhaust gaskets. To install:
  6. Be sure to use all new gaskets when required. Assemble the system, check the clearance and tighten the bolts to about 15-30 ft. lbs. (20-41 Nm). Fig. 1: Front exhaust pipe connection common on vehicles with the catalytic converter not included 86813320.gif

  7. All clamps should be tightened to about 18-25 ft. lbs. (24-34 Nm). Do overtighten the clamps. If pipes become dented they can leak.
Pipe With Catalytic Converter
  1. Before removing any component of the exhaust system, always squirt a liquid rust dissolving agent onto the fasteners for ease of removal.
  2. Raise and support the vehicle.
  3. On some vehicles you will need to remove the brace from the transaxle.
  4. Remove the exhaust pipe nuts from the manifold.
  5. Support the catalytic converter pipe bolts from the rear of the converter.
  6. Lower the catalytic converter/front pipe assembly from the vehicle. To install:
  7. Be sure to use all new gaskets when required.
  8. Attach the new catalytic converter/front pipe assembly to the vehicle. Tighten the pipe to manifold nuts to 20-40 ft. lbs. (27-55 Nm).
  9. Attach the bolts at the rear of the catalytic converter/front pipe. Tighten them to 30-35 ft. lbs. (41-47 Nm).
  10. Connect the brace at the transaxle if removed.
  11. Lower the vehicle. prev.gif next.gif

Dec 18, 2010 | Buick Century Cars & Trucks

2 Answers

I have an 1998 Chevy Blazer and need to change the catalytic converter, are the flange bolts welded and can i cut them


Catalytic Converter Removal & Installation 2.2L Engine To Remove:
Catalytic converter 2.2L engine gm-03-22-734.gif

  1. Raise and safely support the vehicle.
  2. Disconnect the heated oxygen sensor (HO2S) electrical connector.
  3. Remove the exhaust manifold pipe flange mounting nuts from the catalytic converter.
  4. Remove the catalytic converter flange mounting nuts from the muffler.
  5. Remove the catalytic converter from the muffler.
  6. Remove the catalytic converter from the rear hanger bracket insulator.
  7. Remove the catalytic converter.
  8. Remove the (HO2S) from the catalytic converter.
To Install:
  1. Install the (HO2S) to the catalytic converter.
  2. Install a new gasket and the catalytic converter to the muffler.
  3. Install catalytic converter to the catalytic converter hanger.
  4. Install the catalytic converter flange mounting nuts to the muffler flange.
    • Tighten to 26 ft lbs (35 Nm).
  5. Install the catalytic converter flange mounting nuts to the exhaust manifold pipe flange.
    • Tighten to 26 ft lbs (35 Nm).
  6. Connect the heated oxygen sensor (HO2S) electrical connector.
  7. Lower the vehicle.
------ Catalytic Converter Removal & Installation 4.3L Engine To Remove:
  1. Raise and safely support the vehicle.
  2. Raise and support the transmission.
  3. Remove the transmission support
  4. Disconnect the left and right pre-converter heated oxygen sensor (HO2S) electrical connector.
  5. Disconnect the post-converter (HO2S) connector. Muffler flange and gasket gm-03-43-731.gif

  6. Remove the catalytic converter flange mounting nuts from the muffler.
  7. Remove the catalytic converter from the muffler.
  8. Remove the exhaust manifold flange mounting nuts from the catalytic converter. Catalytic converter 4.3L engine gm-03-43-735.gif

  9. Remove the catalytic converter from the support bracket insulator.
  10. Remove the catalytic converter and gaskets.
  11. Remove the heated oxygen sensor.
To Install:
  1. Install the heated oxygen sensors as needed.
  2. Install a new gasket and the Install the catalytic converter to the support bracket insulator.
  3. Install the catalytic converter to the exhaust manifold flange. Install the mounting nuts.
    • Tighten to 39 ft lbs (53 Nm).
  4. Using a new flange gasket, install the catalytic converter to the muffler. Install the mounting nuts.
    • Tighten to 30 ft lbs (40 Nm).
  5. Connect the left and right pre-converter heated oxygen sensor (HO2S) electrical connectors.
  6. Connect the post-converter (HO2S) electrical connector.
  7. Install the transmission support.
  8. Lower the transmission.
  9. Lower the vehicle.
prev.gif next.gif ---
It looks like you can cut them and replace them with new bolts and nuts.prev.gif next.gif

Sep 05, 2010 | 1998 Chevrolet Blazer

1 Answer

2005 Ford Focus flex pipe repair


Advance auto and auto zone sell just the flex pipe. You will need to have someone cut the old one out and weld the new one in. costs about $20 for part vs $300 for pipew/catalitic converter attached.

May 01, 2010 | 2005 Ford Focus

2 Answers

Looking for all four o2 sensor positon


You should have an O2 sensor on each side of the exhaust down pipe, (diver's and passenger side) have one just before the catalytic converter and one after the catalytic converter. That's all the four O2 sensors the Yukon has.

Oct 31, 2009 | 1999 GMC Yukon

4 Answers

My subaru forester has a rattle in the catalytic converter can it be repaired


I bet its just a the heat shield on the catalytic converter. Subaru uses very thin metal and the heat shield is bolted as opposed to welded together. This rattle is extremely common on subys.

mrmopar is right that you should replace it.

however there is a quick fix that will stop the noise. Go pick up a 6" stainless steel hose clamp at the hardware store. put the hose clamp around the cat. It should be obvious whats loose when you look under the car.

if you are a little handy its not a hard job to do your self. Just 4 bolts. You can get a catalytic converter for $200 online. Get the gaskets too. shouldn't take more than an hour or two.

You will need to put the car on jack stands or rhino ramps to get access. Once you are under the car, the parts are easy to get to.

Always, always chock the tires when your under the car. You do not want a car to fall on you.


Apr 21, 2009 | 2002 Subaru Forester

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