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.
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HOMESERVICE MANUALSCHEVROLET2007IMPALA V6-3.9LREPAIR AND DIAGNOSISSPECIFICATIONSPRESSURE, VACUUM AND TEMPERATURE SPECIFICATIONSFUEL INJECTOR
2007 Chevrolet Impala V6-3.9L
Fuel Injector
2007 Chevrolet Impala V6-3.9LSECTION Fuel Injector
Fuel Injector Pressure Drop 20 kPa (3 psi)
Pressure Drop Calculation
1. Subtract the minimum pressure from the starting pressure for one fuel injector. The result is the pressure drop value.
2. Obtain a pressure drop value for each fuel injector.
3. Add all of the individual pressure drop values except for the injector suspected of being faulty. This is the total pressure drop.
4. Divide the total pressure drop by the number of fuel injectors that were added together. This is the average pressure drop. If the difference between any individual pressure drop and the average pressure drop is more than 20 kPa (3 psi), perform the following procedure:
* Perform the Fuel Injector Cleaning procedure. Service and Repair
* Perform the Fuel Injector Balance Test. Refer to Fuel Injector Diagnosis. Fuel Injector Diagnosis (w/J39021 or w/Tech 2)
Pressure Drop Calculation
1. Subtract the minimum pressure from the starting pressure for one fuel injector. The result is the pressure drop value.
2. Obtain a pressure drop value for each fuel injector.
3. Add all of the individual pressure drop values except for the injector suspected of being faulty. This is the total pressure drop.
4. Divide the total pressure drop by the number of fuel injectors that were added together. This is the average pressure drop. If the difference between any individual pressure drop and the average pressure drop is more than 20 kPa (3 psi), perform the following procedure:
* Perform the Fuel Injector Cleaning procedure. Service and Repair
* Perform the Fuel Injector Balance Test. Refer to Fuel Injector Diagnosis. Fuel Injector Diagnosis (w/J39021 or w/Tech 2)
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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.