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P0263 P0266


New Recruit
Fleet Manager
How do I do an injection quantity test? So, I understand you command the RPM to 1500. What am I looking for when I monitor the injectors? Am I also commanding the injectors to do something, like adjust fuel quantity?


Seasoned Expediter
You need the graphing tool to decipher the txt file. Only some dealers get this info. If you are not at a dealer the data is essentially useless you. Here is the "cowboy" way to do it. Remove the 4 bolt flange and disconnect the DPR from the exhaust. Bring the engine up to temp (176 degrees or higher) Turn off all loads, lights A/C ect. Run the truck for 3 min at 1500rpm and recoded the injection quantity, then let the truck idle for 1 min then record the injection quantity. if the injection quantity is higher t idle then at 1500 your injectors are overfueling. You should inject LESS fuel at idle than at 1500rpm. like I said this can give you an indication but is not the preferred way to do it.