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VW Lupo 1.0 MPI - 4th Cylinder Ignition Loss Issue: Engine Error & Troubleshooting Steps

gogus_92 10089 19
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  • #1 16799599
    gogus_92
    Level 7  
    The problem concerns the VW Lupo 1.0 MPI car. The car shows an engine error - ignition of the fourth cylinder. After clearing the error, it switches on only when the car is running for a long time at low speed. The error does not turn on during normal driving. I bet that they were candles or cables but for checking they were replaced with a candle 4 out of 3 but the error still pointed to the 4th cylinder. After that, the cables were changed from 4 to 3 and further shows the error of the fourth cylinder. What could be the reason? Please help :)
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  • #2 16799686
    moto-kord
    Level 28  
    gogus_92 wrote:
    What could be the reason?

    What the candle on the 4th cylinder looks like is clean or dirty e.g. with oil.
  • #3 16799948
    przemek25l
    Level 29  
    Compression measurement at the beginning. If the compression is correct, check the coil and the injector
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  • #4 16799966
    gogus_92
    Level 7  
    moto-kord wrote:
    gogus_92 wrote:
    What could be the reason?

    What the candle on the 4th cylinder looks like is clean or dirty e.g. with oil.


    The candle is clean

    Added after 1 [minutes]:

    przemek25l wrote:
    Compression measurement at the beginning. If the compression is correct, check the coil and the injector


    And what should the compression value be?
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  • #5 16800159
    Anonymous
    Level 1  
  • #6 16800175
    gogus_92
    Level 7  
    Bieda z nędzą wrote:
    Confident air leakage through leaking servo hose

    The vacuum servo hose was replaced so it falls off.
  • #7 16800624
    przemek25l
    Level 29  
    Check what it is and write the results
  • #8 16801031
    moto-kord
    Level 28  
    gogus_92 wrote:
    And what should the compression value be?

    Normal 10 - 12 (bar)
    7 (bar) minimum
    The engine is warm.
  • #9 16804410
    gogus_92
    Level 7  
    I will check only at the end of the week because I have no way so far. And please tell me if these methods, which I checked if candles and cables are good, make sense? After such a check that the error "does not go" behind the candle or behind the cable can be ruled out that they are the cause of this error? I am asking, because a familiar mechanic claims that it is from replacing candles and wires that you need to start.
  • #10 16805715
    moto-kord
    Level 28  
    gogus_92 wrote:
    I am asking, because a familiar mechanic claims that it is from replacing candles and wires that you need to start.

    Candles and HV cables have been checked yet the ignition coil.
  • #11 16805871
    gogus_92
    Level 7  
    moto-kord wrote:

    Candles and HV cables have been checked yet the ignition coil.


    Compression and coil will be checked on Friday :) I also noticed that the car smokes more :(
  • #12 16815795
    gogus_92
    Level 7  
    Compression on the first piston 11, on the second and third 13.5 and on the fourth 9.
  • #13 16816106
    moto-kord
    Level 28  
    gogus_92 wrote:
    Compression on the first piston 11, on the second and third 13.5 and on the fourth 9.

    What mechanic opinion after measuring the compression ?.
  • #14 16816407
    gogus_92
    Level 7  
    The mechanic claims that the head and rings should be done. He says the pressure on the 4th cylinder is too low compared to the others. What is your opinion?
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  • #15 16816462
    andrzej20001
    Level 43  
    To get detailed information you really need knowledge and you will not go without an oil test
  • #16 16816465
    gogus_92
    Level 7  
    And what is the oil test?
  • #19 16859471
    gogus_92
    Level 7  
    After the oil test carried out on the 1.2 and 3 cylinder compression 18, and on the fourth 10. Could someone help interpret these results? :)
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Topic summary

The discussion revolves around an ignition loss issue in a VW Lupo 1.0 MPI, specifically concerning the fourth cylinder. The user reports an engine error that activates after prolonged low-speed driving, despite replacing spark plugs and cables. Responses suggest checking the condition of the spark plug, measuring compression, and inspecting the ignition coil and injector. The user finds the spark plug clean but later measures compression values indicating a significant drop in the fourth cylinder (9 bar compared to 11 and 13.5 in others). A mechanic advises that the low pressure in the fourth cylinder may require head and ring repairs. Further discussions include the need for an oil test to diagnose the issue more accurately.
Summary generated by the language model.
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