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 MANUALSCHEVROLET1985IMPALA 4.3 Z, 700R4/MD8REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMFUEL INJECTION SYSTEM - DIESELADJUSTMENTSADJUSTING THE HPAAC SERIES WITH INTERNAL EGR
1985 Chevrolet Impala 4.3 Z, 700R4/MD8
C Series with Internal EGR
1985 Chevrolet Impala 4.3 Z, 700R4/MD8SECTION C Series with Internal EGR
- Install the HPAA assembly onto the fuel return pipes. Connect a jumper lead to the positive terminal of the battery and connect the jumper to the HPAA solenoid lead terminal. With engine running, housing pressure should be 13-17 psi. (.9-1.2 kg/cm2 ).
- If not to specifications, disconnect the jumper to the HPAA. If housing pressure is not 9-11 psi (.6-.8 kg/cm2 ), adjust the housing pressure regulator. Reconnect the jumper to the HPAA. If housing pressure is not 13-17 psi (.9-1.2 kg/cm2 ), adjust the HPAA pressure regulator. See No. 2 above.
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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.