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.
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HOMESERVICE MANUALSCHEVROLET1995S10/T10 P/U 2WD L4-2.2L VIN 4REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSSYSTEM CHECK - RESTRICTED EXHAUST
1995 Chevrolet S10/T10 P/U 2WD L4-2.2L VIN 4
System Check - Restricted Exhaust
1995 Chevrolet S10/T10 P/U 2WD L4-2.2L VIN 4SECTION System Check - Restricted Exhaust
Restricted Exhaust System Check:
RESTRICTED EXHAUST SYSTEM CHECK
Proper diagnosis for a restricted exhaust system is essential before any components are replaced.
CHECK AT HO2S SENSOR
1. Carefully remove Heated Oxygen Sensor (HO2S).
2. Install exhaust backpressure tester kit J 35314-A in place of HO2S.
3. After completing test described below, be sure to coat threads of HO2S with anti-seize compound P/N 5613695 or equivalent prior to re-installation.
DIAGNOSIS
1. With the engine idling at normal operating temperature, observe the exhaust system backpressure reading on the gage. Reading should not exceed 8.6 kPa (1.25 psi).
2. Increase engine speed to 2000 RPM and observe gage. Reading should not exceed 20.7 kPa (3 psi).
3. If the backpressure at either speed exceeds specification, a restricted exhaust system is indicated.
4. Inspect the entire exhaust system for a collapsed pipe, heat distress, or possible internal muffler failure.
5. If there are no obvious reasons for the excessive backpressure, the catalytic converter is suspected to be restricted and should be replaced using current recommended procedures.
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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.