Question about Chevrolet Monte Carlo

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Missing at idle, code 0300 ( random multiple cylinder misfire) changed plugs and checked coils, good. Uses coolant a little....both radiator hoses collapse when shut off ???? Also power steering pump whines and when wheels are turned at idle, it kills engine ?????????

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  • roger_bri797
    roger_bri797 Sep 29, 2009

    Will this cause the engine to get hot as well ? What about the power steering killin the engine when i turn the wheel at idle ?

  • roger_bri797
    roger_bri797 Sep 29, 2009

    Thanks for the fast response....Very helpful..

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Hi,

Sounds like your catalytic converter is clogged. I see this fairly often. A sure sign is the engine will ping and miss if you hold the gas petal to the floor while driving. It won't go over a certain RPM because it can not force the exaust out. The converter is easy to change. Here are instruction:
Catalytic Converter Replacement (3.8L) Removal Procedure
Important: The 3-way catalytic converter is serviced by replacing the entire assembly. Always replace the gasket at the front flange when servicing the 3-way catalytic converter assembly. Never install the original gasket.


missing at idle, code 0300 - 5c4571c.gif

  1. Raise and support the vehicle.
  2. Disconnect the heated oxygen sensor (HO2S) electrical connector.
  3. Remove the exhaust manifold pipe stud nuts.
7f041d6.gif
  1. Remove the catalytic converter bolts.
  2. Remove the 3-way catalytic converter.
  3. Remove the exhaust manifold pipe gasket at the catalytic converter front flange.

Remove the heated oxygen semissing at idle, code 0300 - 0e7a0f9.gif.

0e7a0f9.gif
  1. Install the heated oxygen sensor (HO2S).
  2. Install a new exhaust manifold pipemissing at idle, code 0300 - a884a78.gifthe exhaust manifold pipe studs.
a884a78.gif
  1. Install and support the three way catalytic cmissing at idle, code 0300 - 0fcdb3c.gif/li>
  2. Install the catalytic converter bolts.
0fcdb3c.gif
  1. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  2. Install the exhaust manifold pipe stud nuts. Tighten
    • Tighten the exhaust manifold pipe stud nuts to 32 N·m (24 lb ft). • Tighten the catalytic converter bolts to 45 N·m (33 lb ft).
  3. Connect the heated oxygen sensor (HO2S) electrical connector.
  4. Lower the vehicle.
  5. Inspect the exhaust system for leaks.
Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

DO ACCEPT THE SOLUTION IF 100% SATISFIED,





Posted on Sep 29, 2009

  • taran_2005
    taran_2005 Sep 29, 2009

    Thanks for your response!!

    These are all related to the code. If you will get that code, i have seen such symptoms.


    Once you done with all the above, let me know the update.

    Thanks.


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