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  1. Focus ST Maintenance
    Took my 2015 ST to get a roll cage installed. Was there for a month and the guy apparently never started it so the battery was obviously dead. Luckily after jump starting it, it was fine. But, the P0300 random misfire code popped up. It runs totally fine and I drove it around quite a bit (I know...
  2. Focus ST Maintenance
    Hello all, (Long read here) I would like to firstly apologize as I did have another thread open but my response didn't get anymore. If this is an issue please let me know. I don't want to be annoying, just wanna try and find some solutions. So in essence, I replaced a lot of things that I...
  3. Focus ST Maintenance
    Hello all, (Sorry for the long read once again, just want to be as thorough as possible) So just an update for everyone from the last post about the misfire on my 2018 ST, the cats have been replaced along with the air intake and I'm running a stage 1 tune off my AP just as a placement holder...
  4. Focus ST Maintenance
    Hello all, (Super long read but trying to be as detailed as possible for the best help) I recently got into a 2018 Focus ST about 2 weeks ago. I'm coming form a 350Z so this is my first Ford, first manual, first Turbocharged car, you name it. Once I got accustomed to driving it, the car would...
  5. Focus ST Discussions
    Looking for some feedback on what to do on cold start misfires. This only happens when the car is cold starting it up for the day. So far I’ve done a walnut blast, fuel injectors, Spark plugs, and coil packs. And yet it still misfires on a cold start. Please help!!!
  6. Focus ST Discussions
    I have been having an issue where my engine rpm at idle will drop down to 400-500rpm sounding like it is about to stall before it recovers back to normal idle rpm. The dealer is telling me it is due to coolant intrusion in cylinders 2 and 3 causing them to misfire. They also said the only fix...
  7. Focus ST Discussions
    Hey all. To make a long story short, I am really at a dead end right now trying to figure out what is going on with my car. -at fill up, even if its at less than 50 to E it won’t allow me to put in more than 10 gallons of fuel. -putting any amount of gas in causes it to stall out and shut off...
  8. Focus ST Discussions
    So one week ago today I got a 2014 Ford Focus ST with 120000 miles on it. It isn’t tuned and it has a aftermarket exhaust and a bov. The dealer said he replaced the timing chain. On the same day I got it the cel came on and when I checked the code it was P0302 (cyl2 misfire). It seems to run...
  9. Focus ST Discussions
    I purchased a 2016 FoST2 with 69k miles back in April. This is my first experience with the ST platform. I have noticed recently as weather has started to cool off a bit where I live that when I start the car in the morning the idle with dip down after about 30 seconds then go back up. I will...
  10. Focus ST Discussions
    I was doing a pull one night after work and right about 3500 to 4500 rpms at WOT I suddenly lost power and started misfiring like hell. I’ll provide some pictures of the codes I got from my access port but this is really weird. I did a compression test and with it being a cold engine on a hot...
  11. Focus ST Maintenance
    Hello, I have recently got a CEL. The code is P0302, a misfire in cylinder 2, I replaced all 4 spark plugs with O.E.M. Motorcraft plugs. The CEL went away, but returned 12 days later. I did an advanced scan on my friends scanner and received the P0302 code again, plus P018B & P0170A code...
  12. Focus ST Discussions
    Okay so let’s start with swapped ST motor a few months back with a escape motor 2.0T gears a lot of people did that swap went great professionally done and all ! issuss as follows -misfire when put under load for a period of time -had a random misfire code-cyl2 misfire-cyl3 misfire, turned...
  13. Focus ST Discussions
    Hi all, for over a year now my 2016 ST3 drives "funky" until the engine is completely warm. At low throttle (anywhere from 6-10% accel. position), I see my AFR fluctuate between roughly 13 and 15 every second or so, in all gears at any speed. It feels similar to the AC kicking on and off, but...
  14. Focus ST Discussions
    I could use some advice on what is causing this misfire issue. It’s a 2018 ST3 with 62k. Never been tuned. Mods are fmic and bov. WMI was installed after issues started (see below). It’s a misfire on cyl 1 & 4 only at highway speeds cruising. Issue started a couple months ago with a misfire on...
  15. Focus ST Maintenance
    2014 ST1, APv3, few basic mods including the 3.5" Depo intercooler, Stratified custom tune. I'd had the NGK one-step-colder plugs in the car and the throttle response and boost were great. That is, until after about 10k miles on the plugs the misfires began under load - cylinders 2 and 4 both...
  16. Focus ST Discussions
    Hello ST gurus, I am a new member to the forum. I have a 2014 ST3, 135k miles, no mods, and it is causing me issues. It stalled out in the middle of traffic the other day and had to push it and "limp" it to a buddies house around the corner. Thought it was the purge valve recall, so I went ahead...
  17. Focus ST Discussions
    Hey guys so my car recently had a cylinder 1 misfire code show up and a misfire upon start up code show up as well on different days. So a little back story I have a 2014 Ford Focus ST with intake, catless down pipe, 3inch injen cat back,oil catch can, NGK one step colder plugs gapped at 26, and...
  18. Focus ST Discussions
    So im toubles when going on 4th gear and about 3800rpms and it mostly happens when the road is uphill, it lights the check engine and the car struggles, according to Torque app is a mysfire on cylinder 2 and sometimes 3. P0300 - P0301 - P0302 are the codes that always shows. i have already...
  19. Focus ST Discussions
    I’ve been hesitant to post about this because I’ve been working with Alex from Stratified on my tune and wanted to see if anyone has a similar problem. I blew the motor about a year ago and spent the extra money on a mountune mrx long block (they installed it as well) and seem to not be able to...
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