Skoda Fabia Misfire.

[broonger-boy]

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Edited by broonger-boy on Saturday 4th April 13:19

[davepoth]

Sounds fairly classically to be a head gasket on the way out. Check for oil in coolant, coolant in oil, exhaust gas in the coolant, and coolant and oil loss.

[thebirdman]

Worth checking. No3 injector itself ( you could do this yourself by swapping around). Check wiring to no3 injector. Since its obviously not coil pack or spark plug as youve already established, take a look at the coil pack supply wiring as this often breaks down. It's unlikely to be ecu. Doubtfully it's head gasket but you could easily rule this out by pressure test, combustion test or simply looking at the old plugs would give you a good idea. All IMO of course. Hope you get it sorted, let us know how you get on.

[Mr2Mike]

Burnt exhaust valves are relatively common on the 100bhp 16v, though a totally burnt valve would be giving much lower or zero compression than 11 bar. It's possible it's only leaking a little however, and a leakdown test would help to determine if this is causing your lower compression.

[bearman68]

How did you get on with your misfire.
Your theory sounds pretty good to me -low compression (valves sprung to mind) and ecu switching injector off.

[mosp]

Used to have one of these myself and there was a lit of Internet talk about wear on piston rings being a known issue. Mine used to display the symptoms which you are talking about and use a LOT of oil, I got shot sharpish!

[bearman68]

More thinking - Is the compression still as bad when the engine is hot? How does it compare to the other cylinders hot and cold?