logo elektroda
logo elektroda
X
logo elektroda
Advanced Search
logo elektroda

Renault clio 3 (1.2) 16V - Uneven engine operation and the message CHECK CHECK O

Sztampura123 17226 13
Best answers

Why does my Renault Clio 3 1.2 16V run unevenly and show the CHECK EXHAUST SYSTEM warning?

The most likely cause is valve clearances set too tight; several users fixed the same 1.2 16V symptom by readjusting the valves, and one noted that Renault engines are very sensitive to this and not every mechanic does it correctly [#17195707][#17106057] For the grooved-camshaft version, the specified clearances were given as 0.25–0.32 mm for the intake valves and 0.35–0.42 mm for the exhaust valves [#16792518]
Generated by the language model.
ADVERTISEMENT
Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
Report a violation of the law
Reply | New topic
  • #1 16789173
    Sztampura123
    Level 7  
    Posts: 7
    Rate: 2
    Hello, I have a problem with my renata clio 3 (1.2) 16V 75HP the engine runs unevenly in every gear and in every speed range and the error is displayed CHECK EXHAUST SYSTEM. The car has 180 thousand mileage and gas driven 165 thousand Some time ago the valves and head planning were changed and something else but I don't remember anymore. The coil was replaced but it did nothing. My mechanic no longer knows what the possibilities are, but it is not known what this is, please help.
  • ADVERTISEMENT
  • #2 16789252
    leonov
    Level 43  
    Posts: 8910
    Help: 1038
    Rate: 2240
    Catalyst not clogged?
  • ADVERTISEMENT
  • #3 16789948
    milejow

    Level 43  
    Posts: 13068
    Help: 1559
    Rate: 5129
    What errors were read from the engine controller?
    Company Account:
    Działalność własna
    Mętów 99, Lublin, 20-388
  • #4 16791166
    Sztampura123
    Level 7  
    Posts: 7
    Rate: 2
    From the computer the error of falling out of the cylinder was read and therefore the coil was replaced but it did not give the possibility of a catalyst but I do not intend to buy a new one and if I would like to remove it, the lambda probe will go crazy again.
  • ADVERTISEMENT
  • #6 16791368
    Sztampura123
    Level 7  
    Posts: 7
    Rate: 2
    Thanks, I haven't heard that much yet. And how can I be sure that it will help, because 150 zlotys is no longer on foot, I drowned on the coil 200 which did nothing, can there be any solution to this problem?
  • #7 16791376
    sebap
    Level 41  
    Posts: 7139
    Help: 538
    Rate: 1078
    I have mounted the same in Scenic and it has been working flawlessly for a year and a half but since the executioner is clogged, you still have to cut it.
  • #8 16791416
    Sztampura123
    Level 7  
    Posts: 7
    Rate: 2
    Thank you very much for the advice, I hope it helps because I can't ride anymore. Any day I will be working with the topic ? kisses.
  • ADVERTISEMENT
  • #9 16792213
    milejow

    Level 43  
    Posts: 13068
    Help: 1559
    Rate: 5129
    Sztampura123 wrote:
    Valves and head planning were replaced some time ago

    How much after that done on gas? Ignition loss is the norm with gas not properly tuned in this engine.
    Company Account:
    Działalność własna
    Mętów 99, Lublin, 20-388
  • #10 16792518
    Przemo9826
    VIP Meritorious for electroda.pl  
    Posts: 7803
    Help: 374
    Rate: 2498
    Candles replaced Ignition cables replaced? Valve clearances adjusted?

    Quote:
    Camshaft with a groove
    This camshaft can be recognized by its groove
    between the cams (A2) and (E2).
    Perform the operations provided in the method again
    valve adjustment specified above, with
    using the following adjustment values:
    - intake valve adjustment clearance: 0.25 to 0.32
    mm
    - outlet valve adjustment clearance: 0.35 to 0.42
    mm


    (A2) Cylinder inlet valve 2
    (E2) Cylinder outlet valve 2
  • #11 16793828
    Sztampura123
    Level 7  
    Posts: 7
    Rate: 2
    I have done about 13,000 on gas since the engine overhaul. And everything was ok and now I drive only on gasoline because I dismantled LPG because I don't do as many km as I used to, besides, I had engine repairs using gas. And the candles and cables were replaced
  • #12 16793909
    sebap
    Level 41  
    Posts: 7139
    Help: 538
    Rate: 1078
    Not by gas only because of the grandfather's installation, printer's assembly or both.
  • #13 17106057
    masz74
    Level 1  
    Posts: 1
    Rate: 1
    Hello.
    I just worked on such a problem with uneven operation of the engine on a cold. One mechanic dismantled all engine equipment and electronics including the computer. The effect my car was the king of tow trucks for several days. I set the ultimatum cart to be brought to the state at least from the first visit to him. I changed the mechanic and surprisingly managed to heal 1.2 16V. The previous "magician" adjusted the valves too tightly.
  • #14 17195707
    ving
    Level 12  
    Posts: 10
    Help: 1
    Rate: 20
    Hello
    I used to have such a problem. Uneven engine operation, CHEK indicator lights up. Adjusting the valve clearances helped. I warn you, not every mechanic can do this. Renault are specific cars
Reply | New topic
Report a violation of the law

Topic summary

✨ The discussion revolves around a Renault Clio 3 (1.2) 16V experiencing uneven engine operation and a "CHECK EXHAUST SYSTEM" error message. The vehicle has a mileage of 180,000 km, with 165,000 km driven on gas. Previous repairs included valve and head planning, and a coil replacement, which did not resolve the issue. Suggestions from forum members include checking for a clogged catalyst, reading engine controller errors, and considering a catalyst emulator to avoid issues with the lambda probe. Other potential solutions mentioned are adjusting valve clearances and ensuring proper ignition system maintenance, including replacing spark plugs and ignition cables. One user shared a personal experience where valve adjustment resolved similar problems.
Generated by the language model.

FAQ

TL;DR: Uneven running and “CHECK EXHAUST SYSTEM” on Renault Clio III 1.2 16V often trace to valve clearance or a clogged catalyst; one user’s emulator fix has been “working flawlessly for a year and a half.” [Elektroda, sebap, post #16791376]

Why it matters: This FAQ helps Clio 3 owners quickly diagnose misfire, exhaust warnings, and LPG-related issues with clear next steps.

Quick Facts

What does “CHECK EXHAUST SYSTEM” mean on a Clio 3 1.2 16V?

It flags abnormal exhaust readings. Common triggers include catalyst restriction, misfires, or post‑cat oxygen sensor disagreement. A clogged catalyst can cause power loss and warnings, so check it early. If misfires occur, the ECU may blame the exhaust due to out‑of‑range sensor data. [Elektroda, leonov, post #16789252]

How do I fix uneven idle and misfires on cold start?

Verify and adjust valve clearances to spec. Multiple owners report rough running and warnings disappearing after a proper adjustment. Renault valvetrain setup is sensitive; choose a mechanic experienced with these engines. “Renault are specific cars,” one contributor notes. [Elektroda, ving, post #17195707]

What valve clearances should I set on the D4F 1.2 16V?

For the camshaft with the groove, set intake to 0.25–0.32 mm and exhaust to 0.35–0.42 mm. Incorrect settings cause misfires and poor drivability. Recheck after tightening. Follow the stated procedure precisely for reliable results. [Elektroda, Przemo9826, post #16792518]

Could my LPG installation be causing the misfire?

Yes. “Ignition loss is the norm with gas not properly tuned in this engine.” Poor calibration or installation quality often leads to misfires and dashboard warnings. Have a qualified LPG specialist recalibrate or inspect injectors and maps. [Elektroda, milejow, post #16792213]

I replaced the ignition coil and still have misfires—what next?

Check spark plugs and HV leads, then measure and set valve clearances to the specified ranges. If misfires persist, evaluate catalyst backpressure. These steps address the most common non‑coil causes observed by owners and techs. [Elektroda, Przemo9826, post #16792518]

Is my catalytic converter clogged, and what are the symptoms?

Clogging causes uneven running, loss of power, and exhaust warnings. One member solved the sensor fault pathway with a catalyst emulator, but noted that a clogged unit still needs physical removal or replacement. Diagnose backpressure before deciding. [Elektroda, sebap, post #16791376]

Can I remove the catalyst without triggering a fault?

If you delete the catalyst, the downstream oxygen sensor will detect it and set a fault. Owners use a post‑cat lambda emulator to prevent the error after removal. Choose a model intended for Renault sensor signals. [Elektroda, sebap, post #16791176]

How much does a catalyst emulator cost and is it worth it?

One owner cited about 150 PLN for the emulator hardware. It can suppress post‑cat sensor errors after catalyst removal. It does not restore flow if your catalyst is physically clogged; address the root cause first. [Elektroda, Sztampura123, post #16791368]

Has anyone run a catalyst emulator long‑term on a Renault?

Yes. A contributor installed one on a Scenic and reported it “working flawlessly for a year and a half.” This suggests decent reliability when correctly fitted and wired. Use heat‑resistant connections and protect from moisture. [Elektroda, sebap, post #16791376]

I removed LPG but the car still runs rough—why?

LPG can mask or aggravate underlying issues. After removal, persistent misfires point to valve clearance, ignition parts, or catalyst restriction. One owner still had problems while running on petrol after de‑installing LPG. [Elektroda, Sztampura123, post #16793828]

Quick 3‑step diagnosis for CHECK EXHAUST plus misfire?

  1. Read ECU codes and note misfire cylinders. 2. Inspect plugs and leads; replace if aged. 3. Measure valve clearances and reset to 0.25–0.32 mm intake, 0.35–0.42 mm exhaust. Re‑test idle and load. [Elektroda, Przemo9826, post #16792518]

Can tight valves really cause rough running on this engine?

Yes. One owner suffered repeated breakdowns after a shop set the valves too tight. A different mechanic corrected clearances and cured the issue. Tight valves hurt compression and cold drivability. [Elektroda, masz74, post #17106057]

What is a lambda (oxygen) probe, and why does it complain after cat removal?

It measures oxygen to verify catalyst efficiency. After removing the catalyst, the downstream sensor sees similar readings to the upstream one and flags a fault. That is why owners mention emulators after cat delete. [Elektroda, Sztampura123, post #16791166]

What if the problem appeared 13,000 km after an overhaul on LPG?

That timeline suggests wear‑in or a setup drift rather than immediate assembly error. Re‑check valve clearances and ignition parts. Also ensure the catalyst did not degrade from prior misfires. The owner reporting this drove 13,000 km post‑repair. [Elektroda, Sztampura123, post #16793828]

Which ignition parts should I verify before deeper engine work?

Confirm correct spark plugs and gap, and test high‑voltage leads under load. Replace aged parts first. Many misfires blame coils, but plugs and leads often share responsibility on this engine. Reassess once basics are fresh. [Elektroda, Przemo9826, post #16792518]

Edge case: Could a bad installation be the real LPG issue?

Yes. A member blamed misbehavior on “grandfather’s installation” and poor assembly. Bad component placement and wiring create persistent faults regardless of fuel. Inspect for workmanship before tuning maps. [Elektroda, sebap, post #16793909]
Generated by the language model.
ADVERTISEMENT