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2017 Focus RS (Canada) / 2022 Hyundai Elantra N / 2009 VW Golf GTI
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Whoa! Those fuel trims are messed up! I’ll look at this more tonight after work.
 
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You replaced the complete purge valve and lines?
 

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2017 Focus RS (Canada) / 2022 Hyundai Elantra N / 2009 VW Golf GTI
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Your readouts still look so much like my evap failure… Can you get short term fuel trim readings too, please?

I will finish checking these against the Ford specs tomorrow; it was a long day of work.

Edit: I will go datalog mine tomorrow morning too, so we have something besides a spec sheet to compare against.
 
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2017, Mk3 Focus RS. Stock, for now!
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Discussion Starter · #88 ·
Your readouts still look so much like my evap failure… Can you get short term fuel trim readings too, please?

I will finish checking these against the Ford specs tomorrow; it was a long day of work.

Edit: I will go datalog mine tomorrow morning too, so we have something besides a spec sheet to compare against.
Much appreciated @Crevarius

Just dug up all the parts I tried replacing too. I also did the high pressure fuel pump and the throttle body.

Evap purge
Grey Font Wood Scaled reptile Monochrome


1 of the O2 sensors (not done the other)
Wood Thumb Nail Wrist Jewellery


Fuel rail pressure sensor (replaced twice)
Hand Fluid Finger Household hardware Gas
 

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2017, Mk3 Focus RS. Stock, for now!
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Discussion Starter · #89 ·
Any idea how I would detect if the self sealing gas cap is actually sealing properly? If not the evap purge, maybe it's pulling air in somewhere? But presuming that would throw an EML/CEL


When idling normally, A/C off

Font Screenshot Number Multimedia Terrestrial plant



Uncommanded high idle, A/C still off

Font Screenshot Number Multimedia Software
ki
 

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How's this going? I'm having similar issues. If I run the car with the front O2 unplugged, it runs beautifully, just get the check engine light. I reached o2 but still same rough idle, yours sounds slightly different being high idle, like maybe accelerator position sensor or throttle body. I'm thinking about replacing my throttle body, curious how yours is coming?
 

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2017, Mk3 Focus RS. Stock, for now!
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Discussion Starter · #91 ·
How's this going? I'm having similar issues. If I run the car with the front O2 unplugged, it runs beautifully, just get the check engine light. I reached o2 but still same rough idle, yours sounds slightly different being high idle, like maybe accelerator position sensor or throttle body. I'm thinking about replacing my throttle body, curious how yours is coming?
I replaced my throttle body entirely and made no change saldy. I've not tried replacing the accelerator pedal yet though. It houses both the APP (accelerator pedal position) sensors. Reason I've not replaced it is because it really should throw a check engine light, but I will probably try it at some point
 

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Usually self revving is a faulty gas pedal ❤
 
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Discussion Starter · #93 ·
Usually self revving is a faulty gas pedal ❤
Replaced pedal but no difference sadly. Suspecting
issue between sensors and instrument cluster and ECU now. It's weird how A\C on or off affects my issue. I think there's some issue between low speed high speed can data getting to the ECU. Something is messed up. Car had an aftermarket immobilizer in it previously. Wondering if a wire was sliced that shouldn't have been! Lord know how to find out though!
 

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2017 Focus RS (Canada) / 2022 Hyundai Elantra N / 2009 VW Golf GTI
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Replaced pedal but no difference sadly. Suspecting
issue between sensors and instrument cluster and ECU now. It's weird how A\C on or off affects my issue. I think there's some issue between low speed high speed can data getting to the ECU. Something is messed up. Car had an aftermarket immobilizer in it previously. Wondering if a wire was sliced that shouldn't have been! Lord know how to find out though!
Damn, I was hoping that would be it. I'm nowhere near my car for another week or two, but when I am maybe we can do a MS teams/Skype call and compare readouts again.
 
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Discussion Starter · #97 ·
I don't know how you haven't torched this car yet......must be extremely patient.
It's one of those things. It's not a major issue, it's just annoying if I'm sitting at traffic lights etc.

But yeah, if it was any other car, it would have been sold by now! 😂 I live in rural Scotland, so I'm minutes away from roads like the below. Car is just the best car I've ever been in for this type of environment. Nothing else comes close in the corners


Sky Vehicle Car Automotive lighting Mountain

Sky Vehicle Car Plant Motor vehicle

Cloud Sky Vehicle registration plate Car Mountain

Tire Wheel Sky Vehicle Car

Cloud Sky Water resources Mirror Mountain

Sky Mountain Road surface Cloud Asphalt

Cloud Sky Hood Mountain Highland

Sky Mountain Road surface Asphalt Windscreen wiper
 

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And I thought Australian road surfaces were dogshi7!
Some of those look like goat tracks! 🐐
All the best getting it sorted out mate.
 
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