Chonpy_snake Posted October 20, 2020 Report Share Posted October 20, 2020 Recently got myself a 2004 Lupo 1.0mpi E. It has an engine issue that is driving me a bit nuts so as part of the process I have decided to join Club Lupo. I appear to have an intermittent misfire on cylinder 1. Believe this to be caused by the compression being 124psi on that cylinder instead of the 177psi on the other 3. Have a really good coil pack fitted and new leads to rule that out as cylinder 4 kept misfiring (now fixed that issue) but the low compression and misfire on cylinder 1 remains. The car doesn't smoke, doesn't consume any oil or coolant and otherwise drives well. How do I rule out the cylinder head gasket and am I missing something glaringly obvious? Apologies for the long winded introduction post 👍🏻 Quote Link to comment Share on other sites More sharing options...
C3peteo Posted October 20, 2020 Report Share Posted October 20, 2020 Have you done both a wet and dry compression test? Quote Link to comment Share on other sites More sharing options...
Chonpy_snake Posted October 20, 2020 Author Report Share Posted October 20, 2020 I certainly have yes. Dry test was 124psi, wet test was 177psi. Also to note that left on the tester, it lost no pressure. Misfire seems to be there at idle and up to 1100rpm and then it's brill Quote Link to comment Share on other sites More sharing options...
Chonpy_snake Posted October 31, 2020 Author Report Share Posted October 31, 2020 Finally got a leakdown test done. We suspect that cylinder 1 exhaust valve is burned out as losing 78% of pressure ..... Only a VW would still run 😆 Repair is on the cards as soon as I can sort out required tools and costs involved 👍🏻 Quote Link to comment Share on other sites More sharing options...
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