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If you have the Stock Bosch Injectors the small drilled passages (#14 and #15) in the Injectors can become completely plugged with Carbon.
The passages are there for low Fuel quantities; like at idle.
Annual Diesel Purges may keep the passages clean but I believe if the are plugged solid a Purge may not help because the chemical will go around the plugged area.
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84 300D, 82 Volvo 244Gl Diesel
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