Chrysler Front Wheel Drive Cars 4-CYL 1981-1995 Repair Information

Air Aspiration System

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OPERATION



See Figures 1 and 2

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Fig. Fig. 1: Air aspirator system used on fuel injected U.S. 2.2L and 2.5L Chrysler engines



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Fig. Fig. 2: Air aspirator system used on Canadian engines

Some 1983 and later cars with the 2.2 and 2.5L Chrysler engines use an air aspiration system in place of an air pump. This system operates off the pulses generated in the exhaust system when the exhaust valves open and close. Canadian carbureted engines and U.S. 50 States EFI engines are the most common applications.

INSPECTION & TESTING



The aspirator valve is not repairable and, if necessary, should be replaced with a new valve.

The most common part of this system to fail is the aspirator valve. Symptoms of failure are excessive exhaust system noise under the hood at idle speed and hardening of the rubber hose leading from the valve to the air cleaner. If there is excessive exhaust system noise, first check the aspirator tube/exhaust manifold assembly joint and hose connections at the aspirator valve and the air cleaner for leakage. If the aspirator tube/exhaust manifold assembly joint is leaking, retighten the aspirator tube and the adapter tube to 50 ft. lbs. (68 Nm). If either hose connection is leaking and the hose has not hardened, install hose clamps.

To determine whether or not the system has failed, disconnect the aspirator system intake hose from the at the air cleaner. Start the engine and allow it to idle in neutral.


CAUTION
Hot exhaust gases may be emitted from the system if the valve has failed.

Cautiously and gradually place your hand near the open end of the aspirator system intake hose. If the valve is operating, the system will be drawing in fresh air, the area around the valve will be cool and you will be able to feel pulses when you touch the open end of the inlet. If the valve has failed, there will be no pulses that can be felt and hot exhaust gas will be emitted.

REMOVAL & INSTALLATION



The aspirator tube and aspirator valve must be replaced as an assembly.

  1. Loosen the hose clamp and disconnect the intake hose at the intake side of the aspirator valve.
  2.  
  3. Remove the aspirator tube bracket screw at the converter, unscrew the flared connector collar nut at the converter and remove the assembly.
  4.  

To install:

Install a new tube in reverse order, tightening the flare nut to 40 ft. lbs. (54 Nm). Tighten all hose clamps securely.

 
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