Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1990 Plymouth Voyager LE, 2.5 J, Automatic, A604FACTORY OEM SERVICE PROCEDURE
Turbocharger Testing: Notes
NOTE:
Each turbocharger has a unique noise level when operating. If sound raises and lowers, check for restrictions in air intake tube or dirt build-up in compressor housing or wheel. If a high-pitched noise or whistle occurs, check for air inlet or exhaust gas leak.
- Remove exhaust outlet pipe from turbocharger housing. Using a mirror, observe wastegate movement while manually operating actuator linkage.
- If wastegate fails to open or close, replace turbocharger assembly. Spin compressor wheel and check for binding. Replace turbocharger if binding exists.
- Remove oil drain back tube from center housing. Check center housing for sludge in oil drain area. If center housing is heavily sludged or caked, replace turbocharger assembly.
- Inspect compressor wheel and housing for signs of oil leakage, gouges, nicks or distortion. If damage or oil leakage is present, replace turbocharger assembly.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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