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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. i10 1st Generation 2007-2014
    Hi, I need some help or recommendations please guys. I am quite clued up with vehicles and the electronics and mechanics etc and have overhauled a number of engines, including this one and other vehicles & trucks in my lifetime. So My wife drives this 2009 Hyundai i10 1.1 GLS 5-Door A/T (PA)...
  12. i20 Forum
    Hello, I recently bought a Hyundai i20 2009 privately, and I have been scammed! Since I have had it, it has been misfiring in cylinders 1 and 3 throwing P0301 and P303 and my mechanic is unsure as to the explanation to this. The coil packs are ok, the spark plugs are ok, does anyone have any...
  13. CM (2007-2012) Santa Fe
    I have a 2008 Santa Fe. About 6 months ago I took it in for a standard oil change and told them I noticed a slight burning smell every so often. They inspected and said it was just bits of oil dripping on hot parts of the engine. They replaced the OCV, but now my check engine light is on...
  14. NF (2006-2010) Sonata
    Thanks for the add! Here’s my 2006 Sonata LX 3.3L V6 160,000miles Got it for $400!.... but at a cost... Looks like it’s leaking oil from the valve cover gasket, starts rough and idles a little rough but once it’s running it’s smooth. Any advice? Where do y'all buy your parts and what should I...
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