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Skoda Fabia 1 (1.1.4 80KM) - Low Compression on One Cylinder: Clogged Emphysema & Ring Damage?

marekwodniak 7233 17
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Should I repair the engine or keep driving when one cylinder shows only 5.5 atm compression and the other three are above 15 atm?

Do not order an engine repair based on that first 5.5 atm reading; have the compression measured again on another gauge, because a later check showed 12 atm on all cylinders, which strongly suggests the first measurement was wrong [#16813574] [#16822216] [#16823015] If low compression is confirmed, test the suspect cylinder by putting a little oil or kerosene through the spark plug hole: if pressure rises, the rings are likely worn; if it does not, look at the valves or head gasket [#16812078] [#16813649] [#16811634] A cylinder at 5.5 atm would not burn properly, so it should not be trusted as-is, but in this thread the final result pointed to normal factory-like compression rather than ring damage [#16813648] [#16822852]
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  • #1 16811519
    marekwodniak
    Level 17  
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    I gave Faba 1.1.4 80 KM. The mechanic did not smoke at all. It turned out that the emphysema was clogged. The car repaired the drive. But it turned out that on 3 cylinders over 15 Atmospheres and on one 5.5, which could cause damage to the rings. Oil was lost by 8 thousand, about 0.8 liters. to drive. And it has power. What do you think. Whether to repair the engine or to drive.
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  • #2 16811634
    DriverMSG
    VIP Meritorious for electroda.pl  
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    marekwodniak wrote:
    which could have damaged the rings
    How can you be sure it's rings, not valves, or a leaky gasket?
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  • #3 16811678
    marekwodniak
    Level 17  
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    There is no confirmation of the mechanic's word that there is little pressure, he said nothing more.
  • #4 16812078
    jarek225
    Level 24  
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    Pour some oil into the cylinder that is not under pressure, and check if the pressure is back, if so, then probably the rings, and if not, look further as it wrote "DriverMSG"
  • #5 16812157
    sulof1601
    Level 26  
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    Hello. A strange case, a cylinder below the pressure limit, three cylinders above what the catalog gives, the car has power and the author does not write anything about uneven idling or excessive smoking ........ it's good that my colleagues above understand something of this .....
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  • #6 16812277
    marekwodniak
    Level 17  
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    On Tuesday, I go to another mechanic for diagnostics. The mechanic, who did it for 20 years, is doing Skoda.
  • #7 16813532
    sulof1601
    Level 26  
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    Probably the Fawority and 105 made in those years, let me know what another mechanic says.
  • #8 16813574
    marekwodniak
    Level 17  
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    Today I visited him again, I wrote him wrong yesterday, I misunderstood him. Today he said that the throttle was gripped from dirt. As for the pressure, just like yesterday, one cylinder over 5 atm. On Tuesday, I'm going to measure the compression pressure of another mechanic.
  • #9 16813648
    mario 77
    Level 23  
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    With such a pressure, it is hard for it to burn well on this cylinder, and thus there is no misfiring, no errors related to it or not even engine operation. Besides, after removing the candles and their condition, you should also see something.
  • #10 16813649
    andrzej20001
    Level 43  
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    Pour 50ml of kerosene into the test through the candle's hole and let it stand overnight. Maybe the ring grabbed.
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  • #11 16814455
    milejow

    Level 43  
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    marekwodniak wrote:
    over 15 Atmospheres on 3 cylinders and 5.5
    marekwodniak wrote:
    The mechanic says you can drive with it. And it has power

    Mechanics change.
    This cylinder is not allowed to work.
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  • #12 16814858
    jarek225
    Level 24  
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    marekwodniak wrote:
    What do you think. Whether to repair the engine or drive.

    Then you know what to do.
  • #13 16815081
    marekwodniak
    Level 17  
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    I'll wait until Tuesday what comes out at the second mechanic.
  • #14 16822216
    marekwodniak
    Level 17  
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    I was with another mechanic to measure the pressure. It was a while because the queue. 12 Atmospheres for all of them. So it was worth checking the measurements.
  • #15 16822852
    sulof1601
    Level 26  
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    So the pressure as I assumed from the factory.
  • #16 16823015
    marekwodniak
    Level 17  
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    And I had a trusted mechanic and I suppose that someone in the workshop was not taken care of or the measuring equipment failed
  • #17 16823456
    servicemen
    Level 29  
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    marekwodniak wrote:
    The car has the power to drive almost 180 per hour


    Keep writing, Antoni is watching :)
  • #18 16823571
    marekwodniak
    Level 17  
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    The only possibility on an empty highway to check what the car is worth. A section of 10 km. I drive like normal people every day.
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Topic summary

✨ The discussion revolves around a Skoda Fabia 1 (1.1.4 80 KM) experiencing low compression in one cylinder, with readings of 5.5 atmospheres compared to over 15 in the others. The user reports oil loss of approximately 0.8 liters over 8,000 km and seeks advice on whether to repair the engine or continue driving. Responses suggest checking for potential issues with the rings, valves, or gaskets, and recommend diagnostic tests, including adding oil to the cylinder to assess pressure changes. A follow-up reveals that a second mechanic measured all cylinders at 12 atmospheres, indicating that initial measurements may have been inaccurate. The discussion emphasizes the importance of accurate diagnostics and the potential for mechanical oversight.
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FAQ

TL;DR: Suspect cylinder compression? Re-test before tearing down: “12 Atmospheres for all of them,” after a second check, resolved panic. [Elektroda, marekwodniak, post #16822216]

Why it matters: This FAQ helps Skoda Fabia 1.4 80 KM owners diagnose one-cylinder low compression and avoid costly missteps.

Quick Facts

What does “low compression on one cylinder” mean in this Fabia?

It means one cylinder seals poorly versus the others. The OP saw ~5.5 atm on one cylinder, while others exceeded 15 atm. That imbalance suggests leakage past rings, valves, or a head gasket. Confirm with a repeat test before deciding on repairs. [Elektroda, marekwodniak, post #16811519]

How do I confirm the compression reading is real?

Re-test with another mechanic and a known-good gauge. In this case, a second shop measured 12 atm uniformly and closed the issue. Always compare all cylinders and record results with the throttle wide open and a charged battery. “12 Atmospheres for all of them.” [Elektroda, marekwodniak, post #16822216]

How do I perform a wet compression test on this engine?

Do a dry test first. Then add a small amount of engine oil into the suspect cylinder through the spark plug hole and retest. If pressure rises, suspect ring sealing. If it does not, inspect valves or the head gasket next. 1. Dry test. 2. Add oil. 3. Re-test. [Elektroda, jarek225, post #16812078]

Is it rings, valves, or head gasket—how do I tell?

Start with wet compression. Rising pressure points to rings. No change points to valves or a head gasket. As one expert put it, “How can you be sure it’s rings, not valves, or a leaky gasket?” Use leak-down testing to localize. [Elektroda, DriverMSG, post #16811634]

What symptoms should I expect at ~5.5 atm on one cylinder?

Expect poor combustion on that cylinder. You may see misfires, a rough idle, and fault codes. An experienced member noted that with such pressure, combustion suffers, so misfires and uneven running are typical. Check plug condition to corroborate. [Elektroda, mario 77, post #16813648]

Can a clogged PCV (called “emphysema” here) or dirty throttle cause low compression?

A clogged crankcase vent or sticky throttle affects drivability, not true compression sealing. In this case, the throttle was dirty and cleaning helped response, but compression concerns persisted until re-testing showed normal values. Address both, but validate compression independently. [Elektroda, marekwodniak, post #16813574]

Is it safe to keep driving if one cylinder reads very low?

No. A veteran member warned that a cylinder with such a reading should not be working. Continued driving risks damage and unburned fuel issues. Verify with a second test before deciding, but do not ignore a grossly low value. [Elektroda, milejow, post #16814455]

My Fabia uses ~0.8 L per 8,000 km. Should I worry about the rings?

That consumption was reported alongside strong performance. Oil use alone did not prove ring failure in this thread. Use wet compression and leak-down to evaluate sealing rather than judging by oil consumption alone. Then monitor usage trend after maintenance. [Elektroda, marekwodniak, post #16811519]

Will inspecting spark plugs help locate the problem cylinder?

Yes. Remove plugs and compare deposits. An oil-fouled plug suggests ring or guide issues. A clean but wet plug suggests poor combustion. The thread notes that plug condition should reveal clues when compression is very low. Log photos before cleaning. [Elektroda, mario 77, post #16813648]

What compression numbers are considered healthy here?

A second shop measured 12 atm across all cylinders, which the community regarded as healthy. Use uniformity as your first criterion. Large spreads matter more than absolute numbers when sources conflict. Retest if results are inconsistent. [Elektroda, marekwodniak, post #16822216]

Why did two mechanics report 5.5–15+ atm first, then 12 atm later?

Measurement error happens. The OP suspected workshop handling or a faulty gauge. Poor procedure, a closed throttle, or a weak battery can also skew results. Always cross-check with another tool and technician before committing to repairs. [Elektroda, marekwodniak, post #16823015]

Does a high top speed prove my engine is fine?

No. Anecdotal top-speed runs do not replace diagnostics. One comment even mocked the claim of “almost 180 per hour.” Focus on uniform compression and drivability metrics, not brief highway tests. Use data, not speed tests, to decide. [Elektroda, servicemen, post #16823456]
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