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Engine Exhaust System Buick Enclave I

Exhaust 3 illustrations ~2196 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Catalytic Converter Brace Bolt50 N.m37 lb ft
Catalytic Converter Hanger Clamp Nut18 N.m13 lb ft
Catalytic Converter to Exhaust Flexible Pipe Nut28 N.m21 lb ft
Catalytic Converter to Exhaust Manifold Nut50 N.m37 lb ft
Exhaust Flexible Pipe to Three-Way Converter Nut50 N.m37 lb ft
Exhaust Manifold Bolt20 N.m15 lb ft
Exhaust Manifold Heat Shield Bolt10 N.m89 lb in
Exhaust Manifold Lower Heat Shield Bolt (Small Bolt)10 N.m89 lb in
Exhaust Manifold Lower Heat Shield Bolt (Large Bolt)50 N.m37 lb ft
Exhaust Muffler Heat Shield Nut9 N.m80 lb in
Three-Way Catalytic Converter to Muffler Assembly Nut50 N.m37 lb ft

Fastener Tightening Specifications

Symptoms - Engine Exhaust

  1. Review the exhaust system description in order to familiarize yourself with the exhaust system components and the intended function of the components. Refer to «Exhaust System Description»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system__exhaust-system-description) .
  2. All diagnostics on a vehicle should follow a logical process. Strategy Based Diagnostics is a uniform approach for repairing all systems. The diagnostic flow is the place to start when repairs are necessary and may always be used in order to resolve a system problem. For a detailed explanation, refer to «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) .

Visual/Physical Inspection

  1. Inspect for aftermarket or non-OEM devices such as, but not limited to; tailpipe extensions, headers, and exhaust cutouts. Any aftermarket exhaust system devices could affect the operation and proper performance of the exhaust system.
  2. Verify the exact operating conditions under which the concern exists. Note factors such as engine RPM, engine temperature, engine load, and frequency of concern.
  3. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause any symptom.

Intermittent

Test the vehicle under the same conditions that the customer reported in order to verify the system is operating as designed.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. Loss of power Refer to «Restricted Exhaust»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system__restricted-exhaust)
  2. Poor acceleration Refer to «Restricted Exhaust»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system__restricted-exhaust)
  3. Poor fuel economy Refer to «Restricted Exhaust»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system__restricted-exhaust)
  4. Excessive smoke diesel Refer to «Restricted Exhaust»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system__restricted-exhaust)
  5. Exhaust hissing noise Refer to «Exhaust Leakage»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system__exhaust-leakage)
  6. Exhaust popping noise Refer to «Exhaust Leakage»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system__exhaust-leakage)
  7. Exhaust rattle noise Refer to «Exhaust Noise»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system__exhaust-noise)
  8. Loud exhaust noise Refer to «Exhaust Noise»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system__exhaust-noise)
  9. Exhaust buzz, groan, hum noise Refer to «Exhaust Noise»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system__exhaust-noise)

Restricted Exhaust

Special Tools

J-35314-A Exhaust Back Pressure Gauge

Diagnostic Aids

WARNINGRefer to Hot Exhaust System Warning .

For dual exhaust systems a quick check of exhaust flow will help determine which side of the exhaust system is restricted. The side that has less exhaust flow is the side that will be suspect, and diagnosis should begin there.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 4 The exhaust system has very low back pressure under normal conditions. If the exhaust system is restricted, a significant increase in the exhaust pressure is noticed on the J-35314-A gauge. Removing the HO2S sensor may set a DTC. When finishing this diagnostic table, be sure to clear all codes.
  2. 5 This step will isolate the catalytic converter from the remainder of the exhaust system.
  3. 8 Confirming that the condition has been fixed is essential. If the symptom still exists and the vehicle has a dual exhaust system, proceed to step 2 and repeat diagnostic procedure on the opposite exhaust pipe.
StepActionValue(s)YesNo
1Did you verify the customers complaint?Go to Step 2
2Did you review the exhaust symptoms diagnostic information and perform the necessary inspections?Go to Step 3Go to Symptoms - Engine Exhaust
3Is the system equipped with dual exhaust?Go to Diagnostic AidsGo to Step 4
4Remove the heated oxygen sensor (HO2S) that is in front of the catalytic converter. Refer to the appropriate procedure. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 , or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 . Install the J-35314-A Exhaust Back Pressure Gauge in place of the HO2S sensor. Start the engine. Increase and monitor the engine speed at 2,500 RPM. Observe the exhaust system back pressure reading on the gauge. Does the reading exceed the specified value?9 kPa (1.25 psi)Go to Step 5Go to Step 8
5Turn the engine OFF and place the ignition in the lock position. Remove the J-35314-A gauge. Reinstall the HO2S sensor. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 , or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 . Remove the post-catalyst HO2S sensor. Refer to the appropriate procedure. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 , or Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 . Install the J-35314-A gauge in place of the post HO2S sensor. Start the engine. Increase and monitor the engine speed at 2,500 RPM. Observe the exhaust system back pressure reading on the gauge. Does the reading exceed the specified value?9 kPa (1.25 psi)Go to Step 6Go to Step 7
6Inspect the exhaust system for the following conditions: Damage in the exhaust pipe Debris in the exhaust pipe Muffler or resonator internal failure Two-layer exhaust pipe separation Did you find and correct the condition?Go to Step 8
7Replace the catalytic converter. Refer to Catalytic Converter Replacement - Left Side , or Catalytic Converter Replacement - Right Side . Did you find and correct the condition?Go to Step 8
8Remove the J-35314-A gauge. Reinstall the applicable HO2S sensor. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 , or Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 . Clear any codes. Road test the vehicle in order to verify the repair. Did you correct the condition?System OKGo to Step 2

Restricted Exhaust

Exhaust Leakage

ConditionAction
WARNING: Refer to Hot Exhaust System Warning . DEFINITION: An exhaust leak may show stains at the area of the leak. The leak may be felt by holding a hand close to the suspected areas or using a smoke pencil. The leak may make a popping or hissing noise.Refer to Symptoms - Engine Exhaust prior to beginning this table.
Misaligned or improperly installed exhaust system componentsAlign and tighten the exhaust system components to the specifications. Refer to Fastener Tightening Specifications . Ensure the exhaust hangers are in the proper locations and not loose.
Exhaust leaks at the following connections: Exhaust manifold to pipe Flanges Pipe clampsTighten the components to the specifications. Refer to Fastener Tightening Specifications .
Seals or gaskets leaking; Exhaust manifold to cylinder head Exhaust pipes to exhaust manifold Catalytic converter connectionReplace the leaking seal or gasket. Refer to the affected components procedure for service.
Irregularities at the mating surfaces on the flange connectionsRepair as required or replace the affected component. Refer to the affected components procedure for service.
Exhaust manifold cracked or brokenReplace the exhaust manifold. Refer to Exhaust Manifold Replacement - Left Side , or Exhaust Manifold Replacement - Right Side .
Exhaust system component connection welds leakingReplace the leaking component. Refer to the affected component's procedure for service.
Muffler or resonator, if equipped, damaged or leaking at the seamsReplace the affected muffler or resonator, if equipped. Refer to Exhaust Muffler Replacement (NEA/NED or N10) , Exhaust Muffler Replacement (NB5) .
WARNING
Refer to Hot Exhaust System Warning .

Exhaust Leakage

Exhaust Noise

ConditionAction
WARNING: Refer to Hot Exhaust System Warning . DEFINITION: An audible or physical noise due to a faulty component or damaged components causing a loose or misaligned exhaust system resulting in a rattle or vibration noise, i.e. buzz, groan, hum.Refer to Symptoms - Engine Exhaust prior to beginning this table.
Popping or hissing noiseExhaust leak-Refer to Exhaust Leakage .
Loud exhaustCompare to a known good vehicle. Inspect for a damaged or failed muffler or resonator, if equipped. Replace the faulty muffler or resonator (if equipped). Refer to Exhaust Muffler Replacement (NEA/NED or N10) , Exhaust Muffler Replacement (NB5) .
External rattle or vibration noiseInspect for a bent or loose hanger, loose heat shield, or loose clamp. Inspect for a exhaust pipe causing interference. Repair or replace the affected component. Refer to the affected component's service procedure.
Internal rattleTest the components by tapping with a rubber mallet to confirm a rattle. Replace the faulty catalytic converter, resonator, if equipped, or muffler. Refer to Exhaust Muffler Replacement (NEA/NED or N10) , Exhaust Muffler Replacement (NB5) .
WARNING
Refer to Hot Exhaust System Warning .

Exhaust Noise

Removal Procedure

WARNINGRefer to Exhaust Service Warning .
  1. Remove the exhaust manifold heat shield. Refer to «Exhaust Manifold Heat Shield Replacement - Left Side»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .
  2. Remove the oil level indicator. Refer to «Oil Level Indicator Tube Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
  3. Remove the catalytic converter. Refer to «Catalytic Converter Replacement - Left Side»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .
  4. Remove the exhaust manifold bolts (1).
  5. Remove the exhaust manifold and gasket. Discard the gasket.
  6. Remove the heated oxygen sensor (1) from the exhaust manifold.

Installation Procedure

Note. A special anti-seize compound is used in the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

  1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
  2. Install the HO2S (1) to the exhaust manifold. Tighten Tighten the sensor to 42 N.m (31 lb ft).
  3. Install one exhaust manifold bolt (1) to the exhaust manifold.
  4. Install the NEW exhaust manifold gasket onto the exhaust manifold and bolt.
  5. Install the exhaust manifold (with gasket) to the cylinder head and the catalytic converter.
  6. Install the remaining exhaust manifold bolts. Tighten Tighten the bolts to 20 N.m (15 lb ft).
  7. Install the catalytic converter. Refer to «Catalytic Converter Replacement - Left Side»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .
  8. Install the oil level indicator. Refer to «Oil Level Indicator Tube Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
  9. Install the exhaust manifold heat shield. Refer to «Exhaust Manifold Heat Shield Replacement - Left Side»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .
WARNINGRefer to Exhaust Service Warning .
  1. Remove the catalytic converter. Refer to «Catalytic Converter Replacement - Right Side»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .
  2. Remove the exhaust manifold heat shield. Refer to «Exhaust Manifold Heat Shield Replacement - Right Side»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .
  3. Remove the exhaust manifold bolts (1).
  4. Remove the exhaust manifold and gasket out from vehicle. Discard the gasket.
  1. Install one exhaust manifold bolt (1) to the exhaust manifold.
  2. Install the NEW exhaust manifold gasket onto the cylinder head and bolt.
  3. Install the exhaust manifold (with gasket) to the catalytic converter and the cylinder head.
  4. Install the exhaust manifold bolts. Tighten Tighten the bolts to 20 N.m (15 lb ft).
  5. Install the exhaust manifold heat shield. Refer to «Exhaust Manifold Heat Shield Replacement - Right Side»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .
  6. Install the catalytic converter. Refer to «Catalytic Converter Replacement - Right Side»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .
WARNINGRefer to Exhaust Service Warning .
  1. Remove the exhaust manifold heat shield. Refer to «Exhaust Manifold Heat Shield Replacement - Left Side»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .
  2. Remove the catalytic converter to exhaust manifold nuts (1).
  3. Remove the exhaust flexible pipe. Refer to «Exhaust Flexible Pipe Replacement»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .
  4. Remove the catalytic converter brace bolt (2).
  5. Remove the catalytic converter from the exhaust manifold.
  6. Remove and discard the catalytic converter to exhaust manifold seal (1).
  1. Install a NEW exhaust manifold seal (1) onto the catalytic converter.
  2. Install the catalytic converter to the exhaust manifold.
  3. Install the catalytic converter brace bolt (2). Tighten Tighten the bolt to 50 N.m (37 lb ft).
  4. Install the exhaust flexible pipe. Refer to «Exhaust Flexible Pipe Replacement»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .
  5. Install the catalytic converter to exhaust manifold nuts (1). Tighten Tighten the nuts to 50 N.m (37 lb ft).
  6. Install the exhaust manifold heat shield. Refer to «Exhaust Manifold Heat Shield Replacement - Left Side»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .
WARNINGRefer to Exhaust Service Warning .
  1. Remove the exhaust flexible pipe. Refer to «Exhaust Flexible Pipe Replacement»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .
  2. Remove the catalytic converter to exhaust manifold nuts (2).
  3. Remove the catalytic converter from the exhaust manifold.
  4. Remove and discard the catalytic converter to exhaust manifold seal (1).
  1. Install a NEW catalytic converter to exhaust manifold seal (1) onto the catalytic converter.
  2. Install the catalytic converter to the exhaust manifold.
  3. Install the catalytic converter to exhaust manifold nuts (2). Tighten Tighten the nuts to 50 N.m (37 lb ft).
  4. Install the exhaust flexible pipe. Refer to «Exhaust Flexible Pipe Replacement»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .

Scheme 1

Scheme 1: Three-Way Catalytic Converter Replacement (LLT)
Scheme 1: Three-Way Catalytic Converter Replacement (LLT)
CalloutComponent Name
Preliminary Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
1Nut (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten 50 N.m (37 lb ft)
2Three-Way Catalytic Converter Procedure Disengage the hanger. Remove and discard the gaskets.
CAUTION
Refer to Fastener Caution .

Three-Way Catalytic Converter Replacement (LLT)

  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Remove the three way catalytic converter to muffler pipe nuts (1).
  3. With the aid of an assistant, separate the rubber insulators from the exhaust underbody hangers (1).
  4. With the aid of an assistant, remove the muffler assembly from exhaust flexible pipe and the vehicle.
  1. With the aid of an assistant, install the muffler assembly to the vehicle and the exhaust flexible pipe.
  2. With the aid of an assistant, install the rubber insulators to the exhaust underbody hangers (1).
  3. Install the three way catalytic converter to muffler piper nuts (1) and tighten to 50 N.m (37 lb ft).
  4. Lower the vehicle.
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Remove the three way catalytic converter to muffler pipe nuts (1).
  3. With the aid of an assistant, separate the rubber insulators from the exhaust underbody hangers (1, 2, and 3).
  4. With the aid of an assistant, remove the muffler assembly from exhaust flexible pipe and the vehicle.
  1. With the aid of an assistant, install the muffler assembly to the vehicle and the exhaust flexible pipe.
  2. With the aid of an assistant, install the rubber insulators to the exhaust underbody hangers (1, 2, and 3).
  3. Install the three way catalytic converter to muffler pipe nuts (1) and tighten to 50 N.m (37 lb ft).
  4. Lower the vehicle.

Scheme 2

Scheme 2: Exhaust Flexible Pipe Replacement
Scheme 2: Exhaust Flexible Pipe Replacement
CalloutComponent Name
Preliminary Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove the frame brace. Refer to Frame Brace Replacement . Remove the heated oxygen sensors. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 , and Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 .
1Nut (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten 28 N.m (21 lb ft)
2Nut (Qty: 2) Tighten 50 N.m (37 lb ft)
3Exhaust Flex Pipe Assembly Procedure Remove and discard the gaskets.
CAUTION
Refer to Fastener Caution .

Exhaust Flexible Pipe Replacement

  1. Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
  2. Remove the exhaust manifold lower heat shield bolts (1, 2).
  3. Remove the exhaust manifold lower heat shield.
  1. Position the exhaust manifold lower heat shield to the engine.
  2. Install the exhaust manifold lower heat shield bolts (1, 2). Tighten bolt (1) to 10 N.m (89 lb in) and tighten bolt (2) to 50 N.m (37 lb ft).
  3. Lower the vehicle.
WARNINGRefer to Exhaust Service Warning .
  1. Remove the heated oxygen sensor (HO2S). Refer to «Heated Oxygen Sensor Replacement - Bank 1 Sensor 1»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
  2. Remove the exhaust flexible pipe. Refer to «Exhaust Flexible Pipe Replacement»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .
  3. Remove the exhaust manifold heat shield bolts (1).
  4. Remove the exhaust manifold heat shield.
  1. Install the exhaust manifold heat shield.
  2. Install the exhaust manifold heat shield bolts (1) and tighten to 10 N.m (89 lb in).
  3. Install the exhaust flexible pipe. Refer to «Exhaust Flexible Pipe Replacement»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .
  4. Install the HO2S. Refer to «Heated Oxygen Sensor Replacement - Bank 1 Sensor 1»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
WARNINGRefer to Exhaust Service Warning .
  1. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
  2. Disconnect the engine wiring harness electrical connector (2) from the heated oxygen sensor (HO2S) electrical connector (3).
  3. Remove the HO2S electrical connector retainer from the engine wiring harness clip (1).
  4. Remove the exhaust manifold heat shield bolts (1).
  5. Remove the exhaust manifold heat shield, sliding the shield up over the HO2S pigtail.
  1. Install the exhaust manifold heat shield, sliding the shield down over the HO2S pigtail.
  2. Install the exhaust manifold heat shield bolts (1) and tighten to 10 N.m (89 lb in).
  3. Connect the engine wiring harness electrical connector (2) to the HO2S electrical connector (3).
  4. Install the HO2S electrical connector retainer to the wiring harness clip (1).
  5. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/buick/enclave/i-2007-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle) .
  1. Remove the muffler assembly. Refer to «Exhaust Muffler Replacement (NEA/NED or N10)»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) , «Exhaust Muffler Replacement (NB5)»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .
  2. Remove the exhaust muffler front heat shield nuts (3).
  3. Remove the exhaust muffler front heat shield (4).
  4. Remove the exhaust muffler heat shield nuts (1).
  5. Remove the exhaust muffler heat shield (2).
  1. Position the exhaust muffler heat shield (2) to the floor panel.
  2. Install the exhaust muffler heat shield nuts (1). Tighten Tighten the nuts to 9 N.m (80 lb in).
  3. Position the exhaust muffler front heat shield (4) to the floor panel.
  4. Install the exhaust muffler front heat shield nuts (3). Tighten Tighten the nuts to 9 N.m (80 lb in).
  5. Install the muffler assembly. Refer to «Exhaust Muffler Replacement (NEA/NED or N10)»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) , «Exhaust Muffler Replacement (NB5)»(/buick/enclave/i-2007-2013/remont/exhaust/#engine-exhaust-system) .

Exhaust System Description

IMPORTANTUse of non-OEM parts may cause driveability concerns.

The exhaust system carries exhaust gases, treated by the catalytic converter, through a resonator, if applicable and into the exhaust muffler where exhaust noise is lessened.

In order to secure the exhaust pipe to the exhaust manifold, a flange and seal-joint coupling is utilized. The exhaust system may utilize a slip-joint coupling design with a clamp and a U-bolt or a flange connection with a gasket.

Exhaust hangers and rubber insulators help to support the weight of the exhaust pipe along with insulating any exhaust system vibration, rattle, or noise.

Exhaust hangers also space the exhaust system away from the underbody of the vehicle and allows the exhaust system to expand as the exhaust system warms up.

Exhaust heat shields are used to protect the body and other components from damage due to the heat from the exhaust system.

The exhaust system may be comprised of the following components

  1. Exhaust manifold
  2. Exhaust pipes
  3. Catalytic converters
  4. Exhaust muffler
  5. Exhaust resonator, if equipped
  6. Exhaust tail pipe, if equipped
  7. Exhaust hangers
  8. Exhaust heat shields

Resonator

Some exhaust systems are equipped with a resonator. The resonator, located either before or after the muffler, allows the use of mufflers with less back pressure. Resonators are used when vehicle characteristics require specific exhaust tuning.

Catalytic Converter

The catalytic converter is an emission control device used to reduce hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx) pollutants from the exhaust gas.

The catalytic converter is comprised of a ceramic monolith substrate, supported in insulation and housed within a sheet metal shell. The substrate may be washcoated with 3 noble metals

  1. Platium (Pt)
  2. Palladium (Pd)
  3. Rhodium (Rh)

The catalyst in the catalytic converter is not serviceable.

Muffler

The exhaust muffler reduces the noise levels of the engine exhaust by the use of tuning tubes. The tuning tubes create channels inside the exhaust muffler that lower the sound levels created by the combustion of the engine.

Special Tools

Illustration Tool Number/ Description EN 35314-A J 35314-A Exhaust Back Pressure Gauge

Scheme 3

Scheme 3: Special Tools
Scheme 3: Special Tools