84 Volvo 240 bogging issue
A bogging and surge once the engine is hot with an RPM limit around 2500 usually points to the PCM going into a protection or limp mode rather than a simple fuel issue. Common causes include a failing MAF sensor, restricted catalytic converter, weak fuel pressure under load, or ignition components breaking down when heat builds up. I’d start by scanning for pending codes, checking fuel pressure at operating temp, and inspecting the MAF for contamination. Also make sure the throttle body is clean and the air intake has no collapsed hoses. Since symptoms can vary by engine and emissions setup, it’s helpful to confirm the exact factory configuration with a vin lookup free https://carfast.express/en/vin_decoder so you’re diagnosing against the correct specs and sensor layout.
Last edited by joeblow; Feb 16, 2026 at 01:21 AM.
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Oct 9, 2022 02:22 PM



