1985 Volvo 244 GL, AutomaticFACTORY OEM SERVICE PROCEDURE

Injection Nozzles: Notes

NOTE: A Blue plastic protective sleeve is fitted on the injector venturi neck in order to protect the needle from carbon deposits. It should not be removed. Injectors with sleeves require a larger I.D. lower sealing ring. Ensure that you are installing the right sealing ring for the injector. Injector with sleeve may be installed in place of an injector without sleeve by removing sleeve.

Problems with injection nozzles usually are accompanied by knocking in 1 or more cylinders, engine overheating, loss of power or performance, black exhaust smoke, and increased fuel consumption. To locate and correct faulty injectors, proceed as follows:

One at a time, with engine running at fast idle, loosen line unions on each injection nozzle. If engine speed remains constant with line removed that nozzle is defective.

Fig 1: Disassembled View of Injector Nozzle Injector opening pressure is determined by shim thickness.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.