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>
- FICM measured >48V on M during cranking AND key-ON. Healthy. Removed
as a suspect.
- Truck starts cleanly on starting fluid (ether) every time, then idles
and runs normally until shut off -- then needs ether again, even when
warm. This is a textbook signature for high-pressure oil (ICP) bleed
during cranking that the HPOP can outrun at running RPM.
- Updated working hypothesis to focus on STC fitting / oil rail O-rings /
HPOP / IPR. Compression, FICM, CMP/CKP, fuel supply all confirmed good
by virtue of the engine running cleanly once started.
- Reordered open items to put visual inspection of valve covers + STC
fitting first.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
obd_reader.py:
- Mode 22 plumbing: ELM.mode22() sends a 16-bit PID request, parses both
positive (62 ..) and negative (7F 22 NRC) responses.
- --ford runs a small TENTATIVE table of community-sourced Ford 6.0 PIDs
(ICP/IPR/FICM/EBP/EOT). All printed with raw bytes for verification.
- --pid XXXX probes a single PID and prints multiple candidate decodings
(u8, u16, mV, temp, duty) so we can eyeball the right scaling.
- --watch [N] streams ATRV + module voltage (PID 0142) for N seconds.
Designed for capturing voltage sag during cranking.
- --scan AAAA-BBBB brute-force scans Mode-22 PIDs with --scan-log PATH
for output. Uses fast ELM timing (ATAT2, ATST19) for ~3.5 PIDs/sec.
diagnostics/2026-06-29-no-start/:
- Captured cranking voltage trace, full Mode-22 scan (1000-14FF -> 46
hits), and a session writeup. Working hypothesis: not batteries, not
fuel -- ICP / FICM / CMP. FICM meter test still owed.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
justin