I've had an oil leak for a couple of years, typically having to put in 5 - 7 quarts of oil in between oil changes. In 2025 I had my spark plugs and some oil seal replaced it was quite expensive to have done. 6ish months later my 4th cylinder started misfiring. I took it to the repair shop. They performed an oil wash and it seemed to fix the misfire issue at the time. 3 months later it started to misfire again. I took it back to the repair shop and had them replace all 4 of the ignition coils, which did not help. They recommended I take it the Kia dealer. They believe the engine is burning oil which why it has such high oil consumption and that they believe the engine should be under a warranty. I need a safe vehicle for work and travel and frustrated that I am having to pay so much money just trying to get my vehicle repaired so it is.
2018 Kia Sportage: misfire or rough idle
5 of the 166 complaints about the 2018 Kia Sportage describe misfire or rough idle.
- owner complaints
- 5
- of this car's complaints
- 3%
- recalls
- 1
Misfire or rough idle by model year
What owners say
I am writing regarding the KIA recall #SC336. About 6 months ago I noticed my 2018 KIA Sportage w 139,000 started using a lil oil. Then 3 days ago it starting cutting out & ck engine light came on. I called mechanic & took it into his shop. He put a coder reader on it and it said, misfire on #2. He did a compression test and there was 0 pressure on #2 cylinder. He then took a camera and went down and there is a hole in #2 piston. He recommends a new engine. He had me call the KIA Customer Care # however, they basically told me the deadline for class action suit expired and I had no remedy with them. My car was not acting up at the end of said deadline so, why would I have filed a claim?! I seen this info on recall #SC336 as to oil consumption & no compression in '20-'23 Souls and Seltos. I have also seen several mechanics forums speaking about my year of Sportage with compression issues. I am a poor lady on disability and still owe $11,000 on this car w no extended warranty coverage. Is there anything I can do in order to get KIA to include my vehicle in an engine recall ? I have now obtained a loan for the $4,800 rebuilt engine I just purchased from Auto Zone! Thank you in advance for your attention to this matter.
first time I had an issue was in August 2023, my check engine light came on, the car was losing power and sputtering. when I would start the car, it would literally sound like a truck. come to find out, the 3rd cylinder was misfiring due to the piston rings being worn and possibly the coils being faulty and an engine replacement was needed. after going back and forth with the dealer (they had my car for almost a month) the engine was finally replaced. fast forward to last week, it started happening again. same cylinder, same issue. now my car is back in the shop waiting for a new engine (#2). my thing is this....did they use a rebuilt engine, or maybe just fixed the old one and call it new. either way, there is no reason I should need a new engine this close to having it repaired. and judging by the complaints I have been reading, the engines on all 2018 Sportages need to be recalled.
At just over 120,000 miles the engine issues begain, # 4 cylinder misfiring, No compression # 4 cyl, would no longer Idel. The Dealer claimed the corrective action was to replace the engine. Are cars no longer expected to last past 100,000miles any more?
I picked up a brand new kia sportage sx turbo awd with 34 miles on it today. It was driving kind of hesitantly, seeming like it was misfiring. About 30 miles later, the check engine light turned on. I immediately called kia customer service as I have an established relationship with them. They advised to take it to the nearest dealership. I took my car to summit place kia in auburn hills where the initial diagnosis based on a check engine light reading was an improper fuel/air mixture in cylinder 2. I am not sure what protocol will be followed from this point or what actions will be needed to rectify this issue. However, it is apparent that there is an issue with kia's gdi turbo engines.
Service bulletins that may apply
- Voluntary emissions service campaign: theta II 2.4L GDI emissions: ECM logic improvement (SC340 revision 5)
- Voluntary emissions service campaign: owner notification (SC340 flight 103 / ql)
- Voluntary emissions service campaign: theta II 2.4L GDI emissions ECM logic improvement (SC340)
- Voluntary emissions service campaign: owner notification (SC340 flight 101 / ql)
- Voluntary service campaign: theta II 2.4L GDI emissions ECM logic improvement (SC340)
- Voluntary emissions service campaign: theta II 2.4L GDI emissions ECM logic improvement (SC340)
- Voluntary emissions service campaign: dealer principal memo (SC340)
- Voluntary emissions service campaign: question and answer (SC340)
Related recalls
Engine
- What is wrong
- Kia Motors America (Kia) is recalling certain 2011-2017 Optima, 2012-2017 Sorento and 2011-2018 Sportage vehicles that previously received an engine replacement under recall number 17V‑224, warranty, or the Knock Sensor Detection System (KSDS) Product Improvement Campaign. The high pressure fuel pipe that connects to the fuel pump outlet may have been damaged, misaligned or improperly torqued during the engine replacement procedure, possibly causing a fuel leak.
- Risk
- A fuel leak in the presence of an ignition source can increase the risk of a fire.
- Remedy
- Kia has notified owners, and dealers will inspect and replace the fuel pipe, as necessary, free of charge. The recall began January 17, 2019. Owners may contact Kia customer service at 1‑800‑333‑4542. Kia's number for this recall is SC172.
Recall number 18V907000 · Recall details
Questions about the 2018 Kia Sportage misfire
Is misfire or rough idle a common problem on the 2018 Kia Sportage?
5 of 166 owner complaints about the 2018 Kia Sportage (3%) mention misfire or rough idle. The model year with the most reports is 2017.
Is there a recall or service bulletin for this on the 2018 Kia Sportage?
There is 1 recall and 51 service bulletins for the same area of the car. Check them below with your VIN.
Other symptoms on the 2018 Kia Sportage
Engine failure 31Check engine light 27Oil consumption 22Knocking 13Fire or smoke 12Loss of power 9Stalling 9Jerking 6Won't shift 5
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