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.
Test Description
The following list gives a description for appropriate step numbers in diagnostic procedure.
- 4 - Engine coolant temperature must be less than operating temperature in order to avoid irregular fuel pressure readings due to hot soak fuel boiling.
- 5 - This step checks that fuel pressure is within specified range.
- 6 - This step checks for a steady fuel pressure reading.
- 7 - The fuel injectors are flowing properly if pressure drop value for each fuel injector is within 1.5 psi (10.0 kPa) of average pressure drop value. Calculate pressure drop value for each fuel injector by subtracting second pressure reading from first pressure reading. See Fig 1.
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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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