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Rsnail · 19th November 2019, 14:24

I took the injectors off anyway and brought all of them to my mechanic to get them properly inspected and cleaned, also the small filters inside of them will be replaced together with all the o rings because they were in a really ugly shape, some of them looked like melted and had some cracks in them. This won't hurt for the car anyway and should help. Just hope that when I install them back the misfire will be gone. And even though I swapped the spark plugs, coils and leads from a good cylinder to the misfiring one and the misfire remained on cylinder nr 5, I still bought a set of 6 iridium spark plugs, and will see if the refreshed injectors and the new spark plugs resolve the issue, if not, I kind of ran out of ideas.

Some more things though:

- If the ECU is the problem, how can one diagnose that?
- What are the readings that the O2 sensors should output when they are operating normally?

19th November 2019, 14:24	#28
Rsnail Gets stuck in Rover 75 Saloon Join Date: May 2015 Location: Essen (Oldenburg), Germany Posts: 626 Thanks: 59 Thanked 30 Times in 28 Posts	I took the injectors off anyway and brought all of them to my mechanic to get them properly inspected and cleaned, also the small filters inside of them will be replaced together with all the o rings because they were in a really ugly shape, some of them looked like melted and had some cracks in them. This won't hurt for the car anyway and should help. Just hope that when I install them back the misfire will be gone. And even though I swapped the spark plugs, coils and leads from a good cylinder to the misfiring one and the misfire remained on cylinder nr 5, I still bought a set of 6 iridium spark plugs, and will see if the refreshed injectors and the new spark plugs resolve the issue, if not, I kind of ran out of ideas. Some more things though: - If the ECU is the problem, how can one diagnose that? - What are the readings that the O2 sensors should output when they are operating normally? Last edited by Rsnail; 19th November 2019 at 14:26..