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Citroen C4 1.6hdi 110km Power Loss: Turbine Control and Pressure Issues

szymon12397 41409 19
Best answers

Why does my Citroën C4 1.6 HDi 110 have no full power even though the turbo actuator works, the shaft has no play, and the ECU shows no error codes?

A likely cause is a fault in the turbo’s variable-geometry mechanism, and in this case the problem was fixed by replacing the turbine geometry blades [#17256169] Even with no ECU errors, you need to check live parameters while driving, because the boost was only about 980–1000 hPa at low revs, then dropped to 950–920 hPa on the road, and only rose slightly to around 1050 hPa at 3000–3500 rpm [#17079355][#17079366] The forum also advised checking intake tightness, vacuum supply, and separating the exhaust to see whether the engine would work better [#17079062][#17079437][#17079897] One reply suggested there is no full power without air, so the boost path, EGR, boost valve, and related lines should be inspected carefully [#17079382]
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  • #1 17079043
    szymon12397
    Level 7  
    Hello. I have a problem with the Citroen c4 1.6hdi 110km, the car does not have the full power. The computer does not show any errors. Turbine control works correctly. The rotor has no play and normally spins. Unfortunately, the turbine does not generate pressure in general.
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  • #2 17079062
    11111olo
    Level 42  
    Have you checked the obvious things? It's about tightness of the intake, are all plugs not squeezed out, etc?
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  • #3 17079065
    szymon12397
    Level 7  
    Yes, of course I checked it first
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  • #4 17079355
    coperfild
    Level 35  
    There may be no errors, but you need to look at the parameters while driving.
  • #5 17079366
    szymon12397
    Level 7  
    At low revolutions, the boost pressure is around 980-1000hPa. While driving, it drops to 950-920hPa. Only at the revolutions of around 3-3.5 thousand, the pressure grew slightly to 1050 hPa.
  • #6 17079382
    kkknc
    Level 43  
    There will be no power without air. Take care of it. Turbo pushes something or do you have a hole? The sensor works, EGR boost valve, EGR itself, stang, valve.
  • #7 17079391
    szymon12397
    Level 7  
    As I wrote earlier, the turbine does not generate pressure at all. The rotor is not rotating, it rotates without any problem.
  • #8 17079414
    kkknc
    Level 43  
    Then start checking why.
  • #9 17079437
    mod22
    Level 28  
    Negative pressure, vacum pump?
  • #10 17079860
    szymon12397
    Level 7  
    Vacuum okej, pear works correctly. The only thing that comes to my mind is the turbine.
  • #11 17079897
    jurekk55
    Level 36  
    Separate the exhalation, check if he wants to work
  • #12 17079901
    szymon12397
    Level 7  
    Okay, I'll check tomorrow.
  • #14 17256169
    szymon12397
    Level 7  
    It helped replace the turbine-fired blades from geometry
  • #15 17256414
    kkknc
    Level 43  
    There is no variable geometry. Only bypass valve.
  • #16 17256435
    szymon12397
    Level 7  
    At 110km there is variable geometry. There is no 90km.
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  • #18 17462513
    Donbart
    Level 2  
    Jurekk55 you are writing to expel the exhalation, I am lacking in power because I have sealed the exhaust manifold, 1.6 hdi
    I would add that I had a power drop so I exchanged EGR and turbine regeneration and replacement of the suction collector
    By the way, I sealed the exhaust because the smell was in the cabin and the car lost its power
    What is the connection of a leaky exhaust to the problem of lack of power because I am so pro Lem?

    Added after 1 [minutes]:

    jurekk55 wrote:
    Separate the exhalation, check if he wants to work


    Jurekk55 you are writing to expel the exhalation, I am lacking in power because I have sealed the exhaust manifold, 1.6 hdi
    I would add that I had a power drop so I exchanged EGR and turbine regeneration and replacement of the suction collector
    By the way, I sealed the exhaust because the smell was in the cabin and the car lost its power
    What kind of leaky connection is connected to the problem of lack of power because I have a problem with me
  • #19 17462645
    jurekk55
    Level 36  
    I guess the simple conclusion is that you may have a blocked FAP or a problem with silencers
  • #20 17462657
    Donbart
    Level 2  
    Theoretically, so crowded Fap, but the computer indicates 50% contaminated
    Recently I cleaned Fap only a problem in this or that the 100% company which I ordered it did it properly
    It shows me an error on the computer that the Fap fluid pump has been damaged
    Before the exhalation was exhausted, but the power was up to 130 / h later the emergency mode was activated
    Now the car is not hissing, but up to 100 accelerates 25 seconds
    Before that, just over 10 seconds was a hundred

Topic summary

✨ The discussion revolves around a power loss issue in a Citroen C4 1.6 HDi 110 km, where the user reports that the car is not achieving full power despite no error codes being displayed by the computer. Initial checks included verifying the tightness of the intake and the functionality of the turbine control. The user noted that boost pressure drops significantly during operation, indicating potential issues with air supply. Suggestions included checking for leaks, examining the EGR system, and ensuring the turbocharger is functioning correctly. The user later reported that replacing the turbine's geometry blades resolved the issue, although there was some debate about the presence of variable geometry in the model. Additional comments highlighted potential problems with the FAP (particulate filter) and exhaust system, which could also contribute to power loss.
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FAQ

TL;DR: "At low revolutions, the boost pressure is around 980–1000 hPa," and it even drops to 920–950 hPa; that screams airflow or VGT issues on a C4 1.6 HDi 110. For owners asking how to fix no-boost/no-power with zero codes. [Elektroda, szymon12397, post #17079366]

Why it matters: This FAQ gives C4 1.6 HDi 110 owners clear steps to diagnose and restore turbo boost and power.

Quick Facts

Why is there no boost but no fault codes on my 1.6 HDi?

Live data beats code reading here. "There will be no power without air." Inspect intake tightness, MAP sensor signal, EGR valve operation, and the turbo actuator linkage. A stuck EGR or inactive actuator can kill boost without codes. Verify the air path first. [Elektroda, kkknc, post #17079382]

What do 980–1000 hPa idle and 950–920 hPa under load indicate?

Those values hug atmospheric pressure and even sag under load. The turbo is not building boost. Slight 1050 hPa near 3–3.5k rpm remains far too low. Suspect airflow restriction, VGT not actuating, or vacuum control issues. [Elektroda, szymon12397, post #17079366]

How can I quickly check for a blocked DPF/FAP or exhaust?

Yes, rule out backpressure before deeper work. How-To: 1. Loosen the joint before the DPF/catalyst to bypass restriction briefly. 2. Road-test; feel for torque return and hear the turbo spool. 3. If power returns, your aftertreatment or silencers are restricted. "Separate the exhalation, check if he wants to work." [Elektroda, jurekk55, post #17079897]

Could a weak vacuum pump cause zero boost?

Yes. VGT actuators and control valves need stable vacuum. Check the vacuum pump output and lines for leaks. Test the actuator with a hand pump. Low vacuum leaves vanes in the wrong position and kills boost. [Elektroda, mod22, post #17079437]

Does the 110 hp 1.6 HDi have a variable-geometry turbo?

Yes. The 110 hp DV6 uses variable geometry. The 90 hp variant uses a bypass wastegate. Stuck vanes will eliminate boost. [Elektroda, szymon12397, post #17256435]

What fixed the original poster’s power loss?

Replacing the turbo’s variable-geometry vane assembly solved the issue. Afterward, boost and power returned to normal. [Elektroda, szymon12397, post #17256169]

What intake checks should I do first?

Verify airtight intake from turbo to manifold. Inspect intercooler hoses, couplers, and clamps. Make sure no plugs or caps have popped off. Repair any splits or oil-softened hoses. [Elektroda, 11111olo, post #17079062]

Turbo spins freely but still no pressure—what should I suspect next?

A free-spinning shaft does not prove vane movement. Carbon-locked or burned VGT vanes can prevent any boost. Replace or refurbish the vane pack if seized. [Elektroda, szymon12397, post #17256169]

Why did sealing an exhaust leak reduce my power?

Sealing leaks can reveal a hidden restriction. Backpressure rises and the engine chokes. Check the FAP/DPF and silencers for blockage. Restoring flow often brings power back. [Elektroda, jurekk55, post #17462645]

My scan tool shows FAP 50% loaded and additive pump fault. What symptoms fit?

An additive pump fault stops proper regeneration. Backpressure increases and performance collapses. Reported acceleration worsened to 25 s 0–100 km/h from just over 10 s, with limp near 130 km/h. Fix the additive system and clean or replace the FAP. [Elektroda, Donbart, post #17462657]

Should I log parameters on a road test? Which ones?

Yes, log live data while driving. Capture MAP, boost command, vacuum control, and EGR position. Record during symptom onset for accurate diagnosis. [Elektroda, coperfild, post #17079355]

What is the “pear” and how do I test it?

The ‘pear’ is the turbo vacuum actuator capsule. It should hold vacuum and move the linkage smoothly. Test with a hand vacuum pump and watch for steady movement. [Elektroda, szymon12397, post #17079860]
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