Throttle closes at WOT after tuning: the MAF overflow trap
Your tune feels fine until 5,000 RPM, then the throttle starts closing. It’s not a sensor — it’s the ECU’s hardcoded airflow overflow limit.
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Find idle maps in EDC17 and MD1 — and the 900 RPM rule
Idle isn’t one map. Where idle maps sit in EDC17, EDC16 and MD1, the 2000-to-1400 search signature in WinOLS, and why 900 RPM is the floor.
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EGR off and DPF won’t burn: the +20% post-injection rule
EGR delete is the easy part. Keeping the DPF burning is the hard part: the +20% post-injection rule, failure modes, and verifying the fix.
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EDC17 DTC tables: one fault, two codes (DTCO and DTCX)
Why a Bosch EDC17 stores every fault as two DTCs — DTCO (generic OBD) and DTCX (manufacturer). How the DTC tables map to DFC checks, with a live DPF sensor example.
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Bosch EDC17 tuning guide: maps through physics
Bosch EDC17 tuning guide: every map explained through engine physics. Driver Wish, Torque Limiter, FMTC, SOI, VNT. By Thomas Pirowski.
