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  1. J

    Mep 804b motor running bad and frequency swinging.

    I have an Mep 804b. It has been running great then all of a sudden it started running bad. The engine is making a funny noise. The frequency is swinging bad. I have changed the fuel filters, oil filter and oil. Did d not help. I thought well maybe it’s the MPU. I checked it and adjusted it to...
  2. J

    804B Yanmar - will not run.

    I have a 804b with yanmar motor. It will crank but will not run. Checked the MPU have 2.5 ac volts while cranking. I have fuel going to injectors but no fuel coming out of injectors.I have checked for voltage on term 9&10 of the GCU no voltage is present. I do have voltage on 3&4 of the GCU. Im...
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