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[Solved] Renault Megane 2 1.9 DCI 2006 - Engine Noise, Power Loss, Smoke & Ignition Issue at 230,000 Mileage

tytan53 7785 11
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  • #1 17192425
    tytan53
    Level 8  
    Hello, yesterday I was returning from Warsaw and I was standing in huge traffic jams on Wisłostrada when I freed myself and went on, I drove some ~ 150km and I was disturbed by a strange sound in the engine, I pulled into the parking lot, opened the hood and the problem disappeared, I continued my journey I drove about 40 km and noticed that the car does not have power, it collects less and less and even adds gas (after pressing the clutch, the revs jumped to the maximum) but it was temporary and the problem disappeared, I pulled to the side of the road because the car started to "scratch" strangely, I opened the hood and heard a strange hitting yes as if some sheets of metal and the noise came from the sides of the head or the turbine.
    After a while, the car started adding gas at idle speed, so I quickly tried to shut down the engine so as not to turn the engine, unfortunately the car refused to obey and would not go out (starting and extinguishing with the button) I decided to throw it on the one and slowly move, the car calmed down but released a huge a cloud of smoke from the muffler (blue and white color) and the oil indicator came on, I added oil, I drove from a kilometer and this smoke appeared again and the oil indicator again. I know that it certainly does not burn the coolant because the condition is correct, but it burns the oil in huge amounts (before the failure there was not a drop of loss) I turned on the intercooler intake today and there are significant amounts of oil (photo) and there was oil in the vicinity of pneumothorax (the engine was dry before) please help what it can be. best regards

    Renault Megane 2 1.9 DCI 2006 - Engine Noise, Power Loss, Smoke & Ignition Issue at 230,000 Mileage
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  • #2 17192492
    szymitsu21
    VIP Meritorious for electroda.pl  
    For example, a damaged turbine throws oil into the intake.
  • #3 17192533
    tytan53
    Level 8  
    What about, for example, this tapping as if the badge hit somewhere?
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  • #4 17192574
    szymitsu21
    VIP Meritorious for electroda.pl  
    tytan53 wrote:
    What about, for example, this tapping as if the badge hit somewhere?


    The oil I get in causes knocking combustion.
  • #5 17192672
    omegolotC30NE
    Level 24  
    tytan53 wrote:
    What about, for example, this tapping as if the badge hit somewhere?


    Most likely it twisted the bushing, you had no oil in the engine anymore and it rubbed. Standard death 1.9 dCi.
  • #6 17192880
    helmud7543
    Level 43  
    Not necessarily because of the lack of oil, more oil has been sucked in and such chaust can bend the cranks (the liquid is incompressible). It is possible that only the knocking combustion (not fully revved) and the engine survived. It is also possible that, however, shells or cranks went.
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  • #7 17193181
    tytan53
    Level 8  
    So probably the engine to be replaced :) or dust the car and buy gas for only what the car is worth now :)
  • #8 17193692
    kakibara
    Level 35  
    Check the turbine.
    The price of the car is now very low.
  • Helpful post
    #9 17193912
    kortyleski
    Level 43  
    Disconnect the intake, fill the engine with oil and start it as naturally aspirated. When it walks nicely and does not knock, it's just Turbo to do and wash intake.
  • #10 17195711
    tytan53
    Level 8  
    A mechanic friend has just checked me and said that the turbo has fallen, I am in the process of disassembling the turbo, if I manage to change it, he will write if it helped. Greetings


    Ps does anyone know how many bolts the turbine is caught in megane 2? two are definitely at the top and what next? After disconnecting all the wires, the turbine itself hangs, but it still sticks to something :roll:
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  • #12 17205157
    tytan53
    Level 8  
    Turbo replaced and everything works
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Topic summary

✨ The discussion revolves around a 2006 Renault Megane 2 1.9 DCI experiencing engine noise, power loss, and ignition issues at 230,000 mileage. The user reported a strange sound from the engine after driving in traffic, followed by a loss of power and unusual knocking noises. Responses suggest potential causes including a damaged turbocharger, oil issues leading to knocking combustion, and possible crankshaft damage. A mechanic confirmed the turbo failure, and after replacing the turbo, the vehicle's performance was restored. Suggestions included checking the turbo, filling the engine with oil, and disconnecting the intake for diagnosis.
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FAQ

TL;DR: After 150 km, a Megane 2 1.9 dCi showed blue/white smoke and “revs jumped to the maximum”—classic oil-ingestion runaway. This FAQ helps owners stop it safely and diagnose the cause. [Elektroda, tytan53, post #17192425]

Why it matters: Diesel runaway can destroy the engine quickly, so fast, correct diagnosis prevents catastrophic damage.

Quick Facts

What are the tell-tale symptoms of turbo oil ingestion on a Megane 1.9 dCi?

Symptoms include loss of power, harsh metallic knocking, and sudden self-acceleration at idle. Expect blue/white exhaust smoke and an oil warning. Oil often appears in intercooler pipes and intake hoses. These signs all showed up together in the reported case. [Elektroda, tytan53, post #17192425]

What component most often causes these exact symptoms?

The turbocharger is the prime suspect. “A damaged turbine throws oil into the intake,” which then fuels uncontrolled combustion. That single fault explains smoke, runaway idle, and loss of power. Replace or rebuild the turbo after inspection. [Elektroda, szymitsu21, post #17192492]

Why does the engine knock or “tap” under these conditions?

Oil entering the cylinders changes combustion timing. “The oil I get in causes knocking combustion,” producing the metallic tapping you hear. The sound can be severe during runaway episodes. Investigate the source of oil before further running. [Elektroda, szymitsu21, post #17192574]

Could the engine be damaged beyond the turbo?

Yes. Large oil ingestion can hydrolock a diesel. “The liquid is incompressible,” so connecting rods can bend under load. Bearings or crankshafts may also suffer damage. If it never fully revved away, the engine may survive with a turbo fix. [Elektroda, helmud7543, post #17192880]

How can I quickly confirm it’s the turbo and not the engine?

Use a simple isolation test.
  1. Disconnect the intake so the engine runs naturally aspirated.
  2. Top up oil to the correct level.
  3. Start and listen; if it idles clean without knocks, fix the turbo and wash the intake. [Elektroda, kortyleski, post #17193912]

Is it safe to keep driving once smoke and runaway symptoms appear?

No. Continuing to drive risks hydrolock and bent rods from incompressible oil. Shut it down and arrange recovery. Running longer can turn a repairable turbo failure into a full engine rebuild. Assess damage only after stopping the oil source. [Elektroda, helmud7543, post #17192880]

What happened when the owner added oil and continued for about 1 km?

Smoke returned and the oil warning reappeared within about one kilometer. That showed the engine was burning oil drawn through the intake. The intercooler and piping already held significant oil. Continuing would have risked a full runaway event. [Elektroda, tytan53, post #17192425]

How do I stop a diesel that won’t shut off with the start/stop button?

Stall it mechanically. Engage a gear and release the clutch while braking to load the engine. The OP selected first and moved to stop it. Avoid opening the hood during a runaway. Focus on a safe controlled stall and recovery. [Elektroda, tytan53, post #17192425]

Do I need to clean the intake and intercooler after replacing the turbo?

Yes. Residual oil in the intake can feed another runaway or smoke episode. After replacing the turbo, wash the intake tract before driving. This removes pooled oil from pipes and the cooler. It also protects your new turbocharger from debris. [Elektroda, kortyleski, post #17193912]

What else holds the turbo after removing the two top bolts?

Expect hidden fasteners. Beyond the two upper bolts, the turbo still attaches to the exhaust and lower supports. The poster noted it still “sticks to something” after freeing the top. Inspect the downpipe clamp and any rear brackets. [Elektroda, tytan53, post #17195711]

Are bearing shells a known weak point after oil-starvation events on the 1.9 dCi?

Yes. One mechanic reported twisted bearing shells after oil loss, calling it the “Standard death 1.9 dCi.” Persistent knock after fixing the turbo suggests bottom-end damage. In that case, plan for a full teardown or replacement engine. [Elektroda, omegolotC30NE, post #17192672]

Will replacing the turbo fix everything?

Often, yes. In this case, a replacement turbo restored normal operation. Still clean the intake and verify no lasting knock. Check oil level and confirm no new smoke. Re-scan for faults after road-testing. [Elektroda, tytan53, post #17205157]

What is the car’s value impact after a turbo failure at high mileage?

Market value drops sharply when a Megane 2 has a failed turbo at this mileage. One member stated, “The price of the car is now very low.” Fixing the turbo first usually improves saleability and price. [Elektroda, kakibara, post #17193692]

Does stable coolant level rule out a head gasket failure here?

It points away from a head gasket. The owner reported correct coolant level, heavy oil consumption, and oil in the intake. Those signs align with turbo oil leakage, not coolant loss. Prioritize turbo and intake inspection. [Elektroda, tytan53, post #17192425]
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