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Catalytic converters over heating after intake manifold installed

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Running rich? Damaged injector?

Posted on Dec 06, 2013

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Posted on Jan 02, 2017

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SOURCE: I had new intake manifold gadket installed noe

Tightening the head bolts has nothing to do with the overheat problem. The new water pump has an air pocket, the air bubble is causing it to cavitate and no suck up water . Try removing the thermostat and see if that will clear the air pocket !

Posted on Jan 02, 2013

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Ticking noise coming from manifold


Ticking noise coming from the manifold? There are two types of manifold....1. Instake manifold and exhaust manifold. Please indentify and apply as needed.

Intake manifold
1. Double check the nuts and bolts around the intake manifold if you worked on it and had it serviced.
2. Spark plugs loose. Yes!! I've seen this before and it comes the rear of the manifold..very confusing.
3. Check your valves and have them adjusted. (This will require a trained and qulified mechanic).
4. Check your motor oil and power steering pump fluid.

Exhaust manifold
1. Check for loose nuts and bolts.
2. Check the O2 sensors connections...some models have 2-3. They are the sensors sticking into the pipes.
3. Your catalytic converter may have a defect. If possible, remove it and shake it to determine failure. (I've seen and experienced the so called honeycomb inside it breakign apart.)
4. Check the exhaust manifold heat shield if applicable.
.

Jul 04, 2014 | 2003 Toyota Avalon

2 Answers

I have an 03 Camry 4cyl LE that needs an O2 sensor. Does this model have more than one sensor? I have gotten conflicting info about the number of sensors and corresponding pns.


YOU HAVE 2 OXYGEN SENSOR UPSTREAM OXYGEN LOCATED ON THE EXHAUST MANIFOLD. THE DOWN STREAM OXYGEN SENSOR LOCATED BEHIND THE CATALYTIC CONVERTER.YOU CAR HAS ONLY 2 OXYGEN SENSORS.

Aug 05, 2011 | 2003 Toyota Camry

1 Answer

How do you drop the exhaust system to pull the oil pan 0n a 1997 Ford 2 liter Escort


Section 309-00: Exhaust Components - General Information 1997 Escort, Tracer Workshop Manual REMOVAL AND INSTALLATION Three Way Catalytic Converter (TWC) Removal
  1. svf~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: When servicing the exhaust system or removing exhaust components, disconnect the heated oxygen sensors at the wiring harness to prevent damage to the sensors and harness.
    Disconnect the heated oxygen sensor (HO2S) electrical connectors.
  1. Remove the (A) five nuts and remove the (B) exhaust manifold heat shield.
  1. Remove the four exhaust manifold to three way catalytic converter (TWC) nuts.
  1. Raise and support the vehicle; refer to Section 100-02 .
  1. Disconnect the downstream HO2S and position it aside.
  1. Remove the two TWC bracket bolts.
  1. Remove the two (A) TWC to muffler inlet pipe bolts and nuts and the (B) TWC. Discard the gasket.

Jun 06, 2011 | Ford Escort 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

2 Answers

Torque specification on a 2003 alero cylinder heads 3.4 liter


3.4L Engine To Remove:
  1. Remove the lower intake manifold.
  2. Remove the exhaust crossover pipe.
  3. If removing the right cylinder head, remove the catalytic converter from exhaust manifold.
  4. If removing the left cylinder head, remove the engine oil dipstick and tube.
  5. Remove the rocker arms and pushrods.
  6. Remove and discard the cylinder head bolts.
  7. Remove the cylinder head.
  8. Clean the mating surfaces on the following items:
    • Cylinder head
    • Cylinder block
    • Intake manifold
  9. Clean the cylinder block bolt threads.
NOTE: During disassembly, keep the valve train components together for proper location during assembly.
To Install:
NOTE: Coat the cylinder head bolt threads using thread sealer.
  1. If removed, install the following components:
    • Exhaust manifold
    • Accessory studs
    • Spark plugs
  2. Place the cylinder head gasket in position over the dowel pins. Ensure that the THIS SIDE UP note is showing.
  3. Install the cylinder head. Cylinder head torque sequence ’99-‘00 gmpc_v6_14.gif

    Cylinder head torque sequence ’01-05 gm-03-34-682.gif

  4. Install the new cylinder head bolts.
    • Tighten the cylinder head bolts a first pass to 44 ft lb (60 Nm).
  5. Tighten the cylinder head bolts in sequence an additional 95 degrees.
  6. Install the intake gasket.
  7. Install the pushrods and rocker arms.
  8. Raise and support the vehicle.
  9. Install the catalytic converter and dipstick tube and indicator if removed.
  10. Lower the vehicle.
  11. Install the exhaust crossover pipe.
  12. Install the intake manifolds.
  13. Connect negative battery cable.
  14. Fill the cooling system.

Jul 03, 2010 | 2003 Oldsmobile Alero

1 Answer

PO420


Not just a faulty catalytic converter will trigger this code. Many other issues can trigger this code.

  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Delayed spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
Possible solutions:
  • Check for exhaust leaks at the manifold, pipes, catalytic converter.
  • Replace Coolant Temperature Sensor
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2)
  • Replace the catalytic converter
  • Have timing adjusted


Aug 25, 2009 | 2002 Toyota Camry

2 Answers

There are 2 oxygen sensors on the 1995 Volvo 850 GLT. Where are they located?


under the intake manifold...which must be removed to get to them

Jun 05, 2009 | 1995 Volvo 850

1 Answer

BMW 328 i 1997: Start up problems / Stuttering / Engine Light


change the pcv valve its under the intake manifold

Feb 18, 2009 | 1997 BMW 328

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