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 .