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Discussion Starter · #21 ·
More updates!
went with a custom tune from Alan Jackson, on revision 1 right now but stopped the process because even that did not fix my idle issue. Gapped my plugs, replaced upstream o2 sensor again (just incase my previous was faulty) and still having rough idle. Went back to stock OEM tune for ****s and giggles and my rough idle went away? But I still have p0171 popping up and now a p219A. Havnt been going into boost, but when I do I notice a lot of black smoke out of exhaust. Pics of my o2 sensor will be attached. Going with fuel filter next and when I get my car shipped to New Jersey, I will finally be able to get it smoke tested and maybe walnut blast the valves if no leaks are found. Will also be doing a compression test soon
 

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Discussion Starter · #22 ·
Another update!

Changed fuel filter, no change. It was easy to do though and I read that it’s recommended every 30-50k miles. At this point I’m trying to be positive and say I’m doing “routine maintenance” 😂

I did complete the compression test, and numbers are as follows
178 cyl 1
178 cyl 2
178 cyl 3
180 cyl 4

So thank god that came out good. Still having rough idle on custom tune but good idle on stock tune (still shows codes though). Will do more troubleshooting after car arrives in Jersey at the end of June or start of July 🤙🏼

Edit:
Also found out that my head gasket recall was done at 3k miles. Currently at 37k
 

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Check fuel Evap purge valve that’s common issue to and affects idle
 

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Who fitted it
 

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2017, Mk3 Focus RS. Stock, for now!
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A smoke test would of worked, but I just got lucky by looking and seeing the huge crack and black dust everywhere
Just got mine smoke tested, sadly nothing came up 😭 the hunt continues for the source of my issue, but running out of things to try! I'm also Scotland based, and can't really find any ford specialists. Ford themselves gave up.

 
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