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How read trouble codes?

Posted: December 12th, 2018, 7:36 pm
by RareCJ8
Mopar efi conversion on 81 CJ. Stroked to 4.6. No CEL. Running like shit. Very hard stumble cold starts. Upon connection of scanner am asked for codes and VIN info. No help. Thus a dead end. Any hacks to get into the computer to read T codes? We’ve tried every mechanical trick to address timing issues but need to learn what computer sees. At my wits end. All this effort and no go. Very very hard starting. After 6 or 7 tries it stays running and after warmed up, runs great. But....how read obd?