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misfire

  1. Focus ST Discussions
    2015 Focus St (1) @87k Mods: Cold air intake, bigger intercooler, Cobb tuner, symposer delete. Got it used, without tuner, ran fine, added Cobb tuner, engine blew up shortly. Replaced the long block and uninstalled the tuner from the car. Problems: Hill start assist not available, random...
  2. Focus ST Discussions
    Hey so i recently moved from FL to MO, i know im due for an oil change. But i didnt empty my oil catch can till a couple weeks being here. And i got this werid fluid and after draining it, i accidently started the car trying to see if i could get more out...like a dummy, while doing such i...
  3. Focus ST Discussions
    Hey everyone, so as I was driving to work yesterday my car started to misfire under light acceleration. I drove it easy then I did a pull in 3rd gear to see if it cleared up. The misfire continued and at about 5k RPM the car would not accelerate anymore and it sounded like launch control sounds...
  4. Focus ST Discussions
    I’m getting a misfire under acceleration that gets worse as the car heat soaks. At first it’s only when you get on it hard but eventually you can’t get more than 10% throttle without it spitting and sputtering. It backfires out the exhaust when it misses and black smoke comes out the exhaust...
  5. Introductions
    So I’m lost at what else could be the issue looking for some idea. 2017 with 82,000 miles threw a p0302 a few weeks ago. You can clearly hear the misfire and it stumbles quite a bit around 2,000 rpm.Checked coil packs, replaced and properly gapped spark plugs, checked and cleaned all fuel...
  6. Focus ST Discussions
    Had a misfire on cylinder 4 after some high rpm 2 stepping, compression is around 32 while all others are at a normal 155 reading, there’s no smoke but there is some oil on top of the piston and the tip of the spark plug, and my valve cover gasket is fine so it makes me believe my valve seals...
  7. Focus ST Discussions
    I purchased a 2013 ST1 back in January of this year(2020). I’ve been chasing a few issues since I bought it. Car was purchased mostly stock minus wing risers and a CPE stage 2 RMM, and Cobb SSM delete. Also, has 2 catch cans installed by first owner. No intake, no exhaust. No AP. Car has a...
  8. Focus ST Maintenance
    I took an hour and a half drive on a freeway and noticed I racked up 257 misfires, which were consistently spread out throughout the drive. What’s going on? Does this matter? And how can I fix this?
  9. Focus ST Maintenance
    Hey guys, So my 2014 Focus ST started having a misfire in cylinder 4 this morning. On my way to work I noticed a slight unusual gurgle at low RPM, didn't think much of it other than I need to keep an eye on that and see if that continues. I got back in the car later and on my way home it...
  10. Focus ST Maintenance
    So today I took my car to get the plugs regapped. It’s a 2014 with 65k and the plugs are NGK iridium with 15k on them. Everything seemed fine, they had spaced out a bit but nothing further than .030”. Anyway I get in the car after they’re done, and as soon as I hit boost in 2nd gear hear a...
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