Diesel Engine Troubleshooting – Solution here:
Diesel Engine Starting Difficulties
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Check the fuel supply. Exchange fuel filters, as they could be clogged.
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Check batteries and connections to starter. There could be a loose connection.
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Look at the starter motor.
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Check fuel pump and fuel lines.
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Check fuel for contamination. Change fuel filters. Dirty fuel will cause problems.
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Check and clean the air filters. Replace if necessary. Plugged filters will also starve the motor.
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Have a shop check the injectors and ECM