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  1. TM (2019+) Santa Fe
    I have a 2023 Santa Fe Calligraphy AWD with the 2.5T Engine that I purchased brand new. The car has just over 9000 miles right now. I am having an issue where the check engine light comes on when the car is started after sitting for a long time. It could be in the morning where the car is...
  2. XD (2001-2006) Elantra
    im back with the 01 elantra gls i finally fixed the head gasket and changed the water pump and timing belt but now the engine has like a misfire not sure if its an injector but I was messing around with cascade to see but I had other things to do and didn't have time to test all the injectors...
  3. SM (2001-2006) Santa Fe
    Hi all, My wife's 2003 Santa-Fe 2.4L has been giving a me a headache for the better part of a year now. This is my first post on here, and there are a lot of details and developments along the story so please bear with me. The TL;DR: - Car intermittently blinks CEL and stutters and misfires...
  4. TG (2006-2011) Azera
    My Azera with ~220,000 miles developed a vibration a while ago only while I am accelerating between 55-85mph. It feels a lot like a constant misfire, but there are no engine codes. The harder I accelerate the harder it vibrates, but still only while driving between 55-85mph. The first thing I...
  5. RB (2012-2017) Accent
    I've been having trouble when quickly accelerating, and rough idle. My dashboard was like Christmas in July when I realized how lit up it was. I took it to get inspected, and he cleared the system. I took care of the other lights so they stayed off, but my check engine light came back after a...
  6. RB (2012-2017) Accent
    I had did a scan on my car a Hyundai accent se 2016. It said my 2 and 4 was miss firing. I have replaced my coils an spark plugs. This didn't fix the issue. If you have any suggestions that migh help please suggest them
  7. CM (2007-2012) Santa Fe
    Hello I have a 2008 hyundai santa fe gls, 2.7 AWD with 140k It was running rough, and one day started mis firing bad and was barely able to make it home. This are the current engine codes: P0441 Evap.Emission Ctri. System Incorrect Purge Flow PO3O0 Multiple Cylinder Misfire Detected POO18...
  8. MD (2011-2016) Elantra sedan/coupe
    I have an automatic 2015 Elantra with (according to the VIN) a GDi 2.0L. The car was originally sold in Canada and imported to my country with 27300km on it. It never had any issues until around ~40ish thousand I noticed a noise when accelerating hard accompanied by a loss of power and a slight...
  9. MD (2011-2016) Elantra sedan/coupe
    Having issues with idle dips by about 100 rpm every few seconds when sitting at red lights (in gear, auto trans), and occasionally when moving at low speeds, car shudders a little bit when it happens, but the idle dips and immediately comes back. First thought is it’s a small misfire, no check...
  10. AD (2017-2020) Elantra
    I took my daughter's 2017 Elantra (SE Value Limited) to a local shop over the issue she was having (it felt like a misfire, would happen once every few days, engine light would come on then go off) and they said the ignition coils needed to be replaced and they quoted me $1050 to do so. I...
  11. CM (2007-2012) Santa Fe
    What I noticed: -CEL codes for all bank 1 cylinders misfire (at the same time) -Misfire stumble felt when easing of gas up a hill (low rpm/heavy load?) once every few days of driving, only when HOT. -Also occurs when hot after idling for a long time -Can be encouraged by pumping then releasing...
  12. MD (2011-2016) Elantra sedan/coupe
    Got a P0304 Cylinder 4 Misfire code and am having poor fuel efficiency and a rough idle. I changed the plugs and ignition coils, no change. Swapped the cylinder 1 and 4 fuel injectors, still cylinder 4 misfire. I checked resistance on all four fuel injectors and they're all the same. What are...
  13. NF (2006-2010) Sonata
    I’m having problems with a 2006 sonata I had just traded for my truck and right after driving problems started coming in and I can see as to why the guy got rid of it. It had a engine code p0306 and I’ve dealt with similar problems so I thought it would be an easy fix. I’ve changed spark plugs...
  14. MD (2011-2016) Elantra sedan/coupe
    Hey everyone, at a little bit of a loss here. I have a base model 2015 Hyundai Elantra. My engine was throwing codes and symptoms of a bad map sensor. Rough idle, losing power while driving, misfiring, running to rich/lean. I order a MAP Sensor cheap off of Amazon, threw it in, it worked but...
  15. LC (2000-2005) Accent
    I have a 2003 Accent. 1.6 M/T. So I was changing the spark plugs and cables because I got misfire cylinder 4. Still kept the code on. So I changed out the coil packs and the code stayed on still. So I went to make sure I connected the coil packs correctly and realized the connecters are broken...
  16. CM (2007-2012) Santa Fe
    Hey y’all! 2007 Santa Fe limited with v6 with 160k miles. About every 50 or 60 starts I get a check engine light and runs real rough. Lasts about 3 starts and then it’s fine for another 50 starts. I finally pulled the codes last night and it says it’s a P0300 “random misfire” on all cylinders...
  17. AD (2017-2020) Elantra
    According to Hyundai Technical Service Bulletin 20-FL-001H, there is a new coil design that’s supposed to address the common misfiring issue in some 2017 2.0L Elantras. I haven’t been able to find anything on the internet (other than the TSB) about the new design, but apparently the shaft is...
  18. Sonata YF Turbo
    Hi folks, this pertains to a 2013 Sonata SE 2.0T. The car has a little over 60k miles, is well maintained, always full synthetic at recommended intervals, air filters etc, but probably overdue for spark plugs. Had the downstream oxygen sensor changed about 6 weeks ago. I am actually in the...
  19. AD (2017-2020) Elantra
    I’m hoping someone can clear this up for me…I’m confused as to what the OEM plugs are for the 2017 Hyundai Elantra SE. I’ve seen that Yura makes the OEM plugs, but I’ve also read that NGK is the OE plug. Also seen Denso. My understanding is also that the Yura plugs are known to have problems...
  20. AD (2017-2020) Elantra
    I have a 2017 Hyundai Elantra SE and last week I was on the highway, going up a hill (long but not very steep), and the car started shuddering, and as I suspected, my OBD2 scanner showed cylinder 1 misfiring. So I pulled off to the shoulder, waited a couple minutes and started the car again...
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