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| Check your turbo aneroid!
Common Symptoms of Aneroid / AFC Issues
• Low Power / Sluggish Takeoff: If the reference line is pinched, cut, disconnected, or the diaphragm ruptures, the pump won't sense boost properly, keeping low-boost fueling restricted and causing the engine to feel weak until high RPMs.
• Excessive Black Smoke: If the AFC pin or diaphragm sticks in the "full fuel" position, or if the starwheel/pre-load is adjusted too aggressively, the engine will dump unburned fuel before the turbo spup up, resulting in heavy black smoke.
Adjustment & Troubleshooting Steps
• Check the Boost Line: Inspect the small air/boost line running from the intake manifold or turbo piping to the aneroid housing on the injection pump to ensure it is not cracked, loose, or plugged.
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CIH 1680 Underpowered Black Smoke... I'm stumped
