Compression Ignition Addict
Join Date: Apr 2007
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I don't know how to test the logic board as an owner. If you think it might be an issue, then send it in to FICMRepair.com.
IPR commanded duty cycle of 40 when idling means you have an issue - probably a leak (assuming that the IPR valve is 100% fine). I would get all the readings when the engine has been fully warmed up.
KOEO readings, cranking readings, and readings at idle for:
IPR % duty cycle
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