justin
6eb449f354
Direct on-truck measurement with the verified 1446 ICP PID: peak cranking ICP 376 psi vs the ~500 psi firing threshold. FICM Main min 48.0 V (healthy), battery min 10.3 V (adequate). Diagnosis empirically confirmed: high-pressure oil bleeds off during cranking. 376 psi is "almost there" not zero, which fits a partial leak (IPR seat / oil rail O-rings / partial STC crack) rather than a fully blown STC fitting. - Capture the --crank output in crank-test-2026-06-30.txt - Add EMPIRICAL CONFIRMATION section to diagnostics README - Update handoff "resume at the truck" to lead with physical inspection (IPR -> STC -> oil rail O-rings), since the OBD-side diagnosis is done Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
37 lines
1.6 KiB
Plaintext
37 lines
1.6 KiB
Plaintext
2026-06-30 -- dedicated ICP-cranking test with the new --crank monitor.
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Command: python obd_reader.py --crank
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===== 6.0 CRANK MONITOR ===== 00:40 1.8 Hz frame 51
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crank the engine q=quit r=reset firing threshold = 500 psi
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ICP [---------------------------------|------] -- psi
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PEAK 376 psi BELOW 500 - keep cranking
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FICM Main -- (min 48.0) [DOC] Batt 11.8V (min 10.3) RPM --
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ICP trace (psi vs time, last 18 samples)
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600 |
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500 |--------------------------------------------------
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| #######
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| ##########
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| ##########
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| ##########
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| ##########
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| ###########
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+--------------------------------------------------
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Verdict line at exit:
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Peak ICP 376 psi -- did NOT reach 500 psi -- suspect high-pressure oil bleed-off.
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Headline:
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* Peak ICP reached 376 psi during cranking -- below the ~500 psi
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needed to physically open injectors. Truck CANNOT fire from cold
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start on its own. Matches the ether-only-starts symptom exactly.
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* FICM Main minimum 48.0 V -- healthy (corroborates the meter).
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* Battery minimum 10.3 V -- sag but adequate.
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* 376 psi is "almost there", not zero. HPOP is making real pressure,
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just losing it. Suggests a partial leak -- IPR seat / oil rail
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O-rings / partial STC fitting crack -- rather than a fully blown STC.
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