ISUZU Amigo/Pick-ups/Rodeo/Trooper 1981-1996

Air Cleaner (Element)

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An air cleaner is used to keep airborne dirt and dust out of the air flowing through the engine. This material, if allowed to enter the engine, would form an abrasive compound in conjunction with the engine oil and drastically shorten engine life. For this reason, you should never run the engine without the air cleaner in place except for a very brief period if required for trouble diagnosis. You should also be sure to use the proper replacement part to avoid poor fit and consequent air leakage.

Proper maintenance is important since a clogged air filter will allow an ever-decreasing amount of air to enter the engine and, therefore, will increasingly enrichen the fuel/air mixture, causing poor fuel economy, a drastic increase in emissions and even serious damage to the catalytic converter system.

SERVICING



Under ordinary driving conditions, inspect the air cleaner filter element every 15,000 miles (24,000 km), and replace it every 30,000 miles (48,000 km) or sooner, if necessary. If you drive under severe conditions (stop-and-go driving in dusty conditions, extensive idling, frequent short trips, operating at sustained high speeds during hot weather above 90°F/32°C, commercial type operation, or trailer towing), inspect the filter every 15,000 miles (24,000 km) and replace it whenever necessary.

When opening up the air cleaner housing to replace the air filter, wipe dust out of the air cleaner with a clean rag. Work carefully, to prevent the entry of dirt, dust, or foreign objects. Also, after you have reassembled the housing, inspect it to make sure the air cleaner is properly installed and sealed tightly. A vacuum leak here could allow dust to enter the engine and cause severely accelerated wear.

REMOVAL & INSTALLATION



The Isuzu truck and sport utility vehicles come equipped with one of two types of air cleaners. Fuel injected vehicles are equipped with a remote located square, or rectangular air filter assembly. This type of air cleaner is attached to the throttle body via an air inlet hose. Carbureted vehicles are equipped with a round air filter assembly mounted directly onto the top of the carburetor throat.


WARNING
Do not immerse the paper air filter element or temperature sensor in cleaning solvents, as damage can result.

Carbureted Vehicles

See Figures 1, 2 and 3

  1. Raise the hood of the vehicle and inspect all of the air cleaner components for damage or improper attachment.
  2.  
  3. Remove the air cleaner cover.
  4.  
  5. Remove the paper air filter element from the air cleaner body. Hold a light on the throttle body side of the element and view the filter from the other side. If light is visible through the element, blow the dust from the element and reuse. If the element is saturated with oil or light is not visible, replace the filter with a new one. If the air filter element is saturated with oil, perform crankcase ventilation system tests, which are located in Emission Controls .
  6.  



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Fig. Fig. 1: The carbureted engines use a round air filter, which is mounted directly on top of the carburetor throat



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Fig. Fig. 2: First remove the air cleaner lid by removing the wingnut ...



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Fig. Fig. 3: ... then lift the old air filter out of the air cleaner housing-carbureted vehicles

To install:
  1. Remove the fiber crankcase filter, if equipped, and clean it with solvent. Squeeze the filter dry and apply a small amount of engine oil to it. If a metallic mesh is used to retain the fiber filter, clean the mesh with solvent and reuse.
  2.  
  3. Clean the inside of the air cleaner housing with compressed air. If the housing is oily, wash it with solvent.
  4.  
  5. Place the filter element in the cleaner body and install the air cleaner cover. Retain the cover in place with the center wingnut; tighten until snug.
  6.  
  7. Make certain all of the parts are correctly connected and in their proper positions.
  8.  

Fuel Injected Vehicles

See Figures 4, 5, 6, 7 and 8



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Fig. Fig. 4: Exploded view of the air cleaner assembly for fuel-injected models



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Fig. Fig. 5: The air filter cover is held in place with snap clamps-fuel injected models



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Fig. Fig. 6: After removing the clamps, lift the air filter cover off ...



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Fig. Fig. 7: ... and lift the filter out of the filter housing-fuel injected models



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Fig. Fig. 8: Blow the dirt out of the air cleaner element from the clean side to the dirty side with compressed air

  1. Raise the hood of the vehicle and inspect all of the air cleaner components for damage or improper attachment.
  2.  
  3. Loosen the throttle body-to-air cleaner assembly air inlet hose clamps, then remove the inlet hose from the vehicle.
  4.  
  5. Unfasten the hold-down clamps on the air cleaner assembly, then lift the lid of the assembly off of the box.
  6.  
  7. Remove the paper air filter element from the air cleaner body. Hold a light on the throttle body side of the element and view the filter from the other side. If light is visible through the element, blow the dust from the element and reuse. If the element is saturated with oil or light is not visible, replace the filter with a new one. If the air filter element is saturated with oil, perform crankcase ventilation system inspection, as described in Emission Controls .
  8.  

To install:
  1. Clean the inside of the air cleaner housing with compressed air, then wipe with a shop rag. If the housing is oily, wash it with solvent.
  2.  
  3. Place the filter element in the cleaner body and install the air cleaner cover. Retain the cover in place with the hold-down clips.
  4.  
  5. Install the air inlet hose onto the throttle body and the air cleaner assemblies. Tighten the air inlet hose clamps until snug.
  6.  
  7. Make certain all parts are correctly connected and in their proper positions.
  8.  
  9. Close the hood.
  10.  

 
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