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.
Restricted Exhaust System: Notes
A restricted or blocked exhaust system usually results in loss or lack of power or popping through carburetor. Ensure that the condition is not caused by timing or ignition problems before testing for restricted exhaust system. See appropriate CHART B-1 in COMPUTERIZED ENGINE CONTROLS section.
To test for restricted exhaust system, you will need a Bourroughs Exhaust Backpressure Tester (BT 8515 or BT 8603). Or if testing at Air Injection Reactor (A.I.R.) pipe, connect hose and nipple from Propane Enrichment Device (J26911) to a fuel pump pressure gauge. See Fig 1 .
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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