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The motor shut down and we thought it ran out of gas. But subsequently it would not run well when fuel added. Was able to force it to run forcing the throttle in neutral but then noticed a chip out of the upper head ***embly (part number 5001115) (under the stator)and it was looseas well. Noticed a few fine bubbles. So, there were no fault codes in EDIAG. Now does the EMM go into a SLOW mode when the oil pressure is low and is the oil pressure low because of the cracked upper head ***embly? If so why no code?