Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1985 BMW 524tdFACTORY OEM SERVICE PROCEDURE
Fuel Injector Pressure Test
- Remove fuel injectors and screw injectors on Test Stand (00 2 540). Operate lever of tester in short, fast strokes. The ejected fuel should have a rather tight and cone-shaped pattern. The ejected fuel stream should break off clearly at the end of each stroke.
- Operate lever of tester slowly and completely (1 to 2 strokes per second). A nozzle in good condition will chatter when fuel is ejected. Press down lever of tester slowly. Read pressure on pressure gauge when ejection begins.
- Press down lever of tester slowly and hold 10 seconds at approximately 290 psi (20.4 kg/cm2 ) below opening pressure. Nozzle must not drip fuel. Fuel injectors may not be repaired. Always replace fuel injector combination when nozzle is defective, leaks, spray pattern is wrong or opening (ejection) pressure is wrong.
Factory Service Tools
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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.
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