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Autopapyrus · Renault Talisman 1.6 16v TCe (2019)
https://autopapyrus.com/guides/renault/talisman/diagnosing-high-fuel-consumption/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Renault Talisman 1.6 16v TCe (2019): Diagnosing High Fuel Consumption

High fuel consumption on the 1.6 TCe is most often caused by a dirty EGR valve, faulty sensors, carbon buildup on the intake valves, or problems in the fuel injection system. Normal consumption for this engine is 6-8 L/100 km (29.4-35.3 mpg US) in mixed driving. Real-world consumption can be 10-20 percent higher than the manufacturer's stated figure.

Difficulty: Medium Time: 1-3 hours (depending on diagnostic depth) Steps: 14 Tools: OBD-II scanner, multimeter, fuel pressure gauge, flashlight, gloves

Part

  • 🔩 Depending on the results: air filter, spark plugs, MAF/MAP/oxygen sensors, fuel filter, EGR valve or fuel injectors (if replacement is needed)
There's a full repair manual for this car Every system, wiring diagrams and torque specs — not just this job. Haynes AutoFix (online). See manuals →

Step by step

14 steps
  1. Connect an OBD-II scanner to the diagnostic port (on the left, under the steering column) and read the trouble codes. Typical codes for high fuel consumption are P0087 (low fuel rail pressure), P0401 (insufficient EGR flow), P0171/P0174 (lean mixture), and MAF or oxygen sensor errors.
  2. Check live data on the scanner: short-term and long-term fuel trims (STFT and LTFT), mass airflow sensor readings at idle (should be 2-4 g/s), coolant temperature, and fuel rail pressure.
  3. Inspect the air filter. A dirty filter restricts airflow and enriches the mixture. Replace it if it is heavily soiled.
  4. Check the EGR valve. Remove it and inspect it for carbon buildup. A stuck valve disturbs the air-fuel mixture and increases consumption. Clean the valve with a carbon cleaner, or replace it if it is mechanically damaged.
  5. Check the condition of the spark plugs. Remove and inspect them. Black deposits or damaged electrodes indicate incomplete fuel combustion. The gap should be 0.9-1.0 mm. Replace them if worn.
  6. Check the mass airflow (MAF) sensor. It is located between the air filter and the intake manifold. A dirty sensor gives incorrect readings and causes an overly rich mixture. Clean it with a dedicated MAF sensor cleaner, or replace it if faulty.
  7. Measure fuel pressure with a gauge. Connect it to the fuel rail; the norm is 3.5-4.0 bar at idle. Low pressure points to a fuel pump problem or a clogged fuel filter.
  8. Check the fuel injectors. Uneven engine running and black exhaust smoke indicate dirty or leaking injectors. Professional bench testing will show spray pattern quality and flow rate. Ultrasonic cleaning or replacement if necessary.
  9. Check the ignition system. A weak spark or misfires increase fuel consumption. Test the ignition coils with a multimeter (primary winding resistance 0.5-1.0 ohm, secondary winding 8-12 kOhm).
  10. Inspect the intake manifold for vacuum leaks. Unmetered air disturbs the air-fuel mixture. Check that the hose clamps are tight and the gaskets are intact. To find a leak, use a smoke machine or spray cleaner on the running engine (a change in engine speed when spraying will reveal the leak location).
  11. Check the oxygen sensors (lambda sensors). The front sensor regulates the air-fuel mixture. Slow response or constant readings indicate wear. Use the scanner to monitor the voltage switching (it should oscillate between 0.1-0.9 V).
  12. Check cylinder compression with a compression tester (if mechanical wear is suspected). The norm is 12-14 bar. The difference between cylinders should be no more than 1 bar. Low compression indicates piston ring or valve wear.
  13. Clean carbon deposits from the intake valves (a typical problem for direct injection engines). Carbon builds up with city driving and the use of low-quality oil. Clean manually by removing the intake manifold, or use a chemical intake cleaning treatment.
  14. After fixing the faults, reset the ECU adaptations with the scanner, or disconnect the battery terminal for 10-15 minutes. This allows the control unit to relearn the fuel trim corrections.

Common mistakes and warnings

  • Accurate diagnosis requires a quality scanner that can display live data. If you have no experience working with fuel systems and electronics, it is recommended to take the car to a repair shop for professional diagnosis. Using poor-quality fuel or failing to replace the air filter on time significantly speeds up wear of the injection components.