Misfire or rough idle on the 2004 Kia Sorento
Only 6 reports for this mode came with an odometer reading, which is too few for percentiles to mean anything. The page is here because someone linked to it; treat the figures as anecdotes, and see the full report for this year instead.
When misfire or rough idle gets reported
There are 6 reports of misfire or rough idle on the 2004 Kia Sorento, 6 with a mileage attached. That is too few to place the failure on the odometer with any confidence.
A part like this is normally expected to survive 92,000 miles. It is the 15th most-reported problem on this model year.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| — | — | 81,447 miles | — | — |
Read the 10th percentile as “one report in ten arrived this early”. Exact figures are shown in this table because it is the table of record; everywhere else on the site they are rounded to the precision the sample can carry.
What a percentile can and cannot tell you here
These five numbers describe the readings owners gave, in order. The median is the middle one: half the reports arrived below it. The 10th and 90th are the edges of the bulk of the distribution, and the distance between them is the part worth reading. A tight spread — say 70,000 to 95,000 miles — points at something that wears out on a schedule, and the schedule is knowable. A wide one, 20,000 to 190,000, points at a fault that hits some cars and never troubles others, which means the mileage on the listing in front of you tells you very little about your odds.
What these figures are not is a survival curve. Every reading here comes from a car whose owner filed a complaint, so the sample contains only failures: it cannot say what share of the fleet made it past 150,000 miles untouched, because those owners had nothing to report. Nor is the mileage the moment of failure — it is the odometer reading as recalled at the time of filing, which may be weeks later and is sometimes rounded to the nearest ten thousand by the person typing it.
Percentiles are shown at all only once 8 readings exist for the vehicle and mode. Below that the middle of a handful of numbers is noise wearing a decimal point, so the figures are withheld rather than dressed up.
What happens, and what it costs
Putting it right typically runs $250–$1,600 at an independent US shop. That range is an editorial estimate held in this site's failure-mode catalogue, not a figure from NHTSA, and it is a repair cost rather than a diagnosis cost.
The same failure on other years
The same failure is reported on 12 model years of this car. It shows up earliest on the 2006, at a median of 10,000 miles, and latest on the 2011 at 135,000 miles.
By volume the 2016 carries the most reports, with 23; the 2004 has 6. A mode that appears across most years of a model is usually a design choice rather than a bad batch.
If one year stands out to the left, that is the year to avoid; if the whole line sits at a similar mileage, this is wear rather than a defect in one production run.
Tick median reported mileage Solid middle half of reports Faint 10th to 90th percentile Colour how bad the failure is when it happens
What owners wrote
Verbatim from NHTSA complaint narratives, trimmed for length. The mileage is the one the owner gave.
I had back firing and the possibility of stalling. Of course I did report this to lawleys, but their response was, well we can't find the problem, so when the check engine light comes on, then bring it back. I had traveled to el paso, tx. And when I was ready to come home, I started this vehicle and it had a very loud clicking noise. I had no oil in the car and there was no warning. As far as the verification of oil changes, I had some, but I didn't have a recent one because it was not time to change the oil until I got back home, but they did not care. Well, the second time that I had a problem I was in willcox, az. It's about 50 miles outside of sierra vista. When I got out there the check engine light came on, and if you read your manual, then you know not to drive the kia with the check engine light on. They said to drive it home. This was on a saturday. I had to wait until monday to bring it into the shop. Come to find out, there was a very big problem with the engine. The lack of power, the backfiring of the engine, it all came from a cylinder misfire. There were dents in the piston top, cylinder wall was damaged, and valve…
I had back firing and the possibility of stalling. Of course I did report this to lawleys, but their response was, well we can't find the problem, so when the check engine light comes on, then bring it back. I had traveled to el paso, tx. And when I was ready to come home, I started this vehicle and it had a very loud clicking noise. I had no oil in the car and there was no warning. As far as the verification of oil changes, I had some, but I didn't have a recent one because it was not time to change the oil until I got back home, but they did not care. Well, the second time that I had a problem I was in willcox, az. It's about 50 miles outside of sierra vista. When I got out there the check engine light came on, and if you read your manual, then you know not to drive the kia with the check engine light on. They said to drive it home. This was on a saturday. I had to wait until monday to bring it into the shop. Come to find out, there was a very big problem with the engine. The lack of power, the backfiring of the engine, it all came from a cylinder misfire. There were dents in the piston top, cylinder wall was damaged, and valve…
@ 62,894 miles: driving from gas station to home less than 1 mile away, engine made noise and started running rough. Parked car overnight, then drove about 3 miles to closest repair shop. Diagnosed as sheered off crankshaft pin/bolt. Repaired under extended warranty with new parts from kia, but one week later had to be towed in because it happened again. Crankshaft was warped so engine was rebuilt with used crankshaft and new parts from kia. @ 104,595 miles: driving on rural road in heavy traffic, lights on dashboard came on and lost power steering. Speed was 55 MPH. Managed to steer car off road without incident. Towed to repair shop. Crankshaft pin/bolt sheered off. Cost to repair $895.30. @ 109,885 miles: engine began making clicking noises and lost power steering, etc. Crankshaft pin/bolt sheered off. Repair not recommended. Replacement engine recommended. There is a class action lawsuit pending against kia for this problem. Please search online and you will find there are literally thousands of people who have had this issue with this same vehicle (2002-2009) and many had accidents because of it. Why is this not in the news?…
Also reported on the 2004 Kia Sorento
Other engine problem
Radiator or coolant leak
Other powertrain problem
Other electrical problem
Other body or interior problem
Differential or transfer case failure
How far this goes
This page is kept out of search results because 6 reports is not enough to publish percentiles from. It stays reachable because somebody looking at this exact car would rather see the reports than be told there are none.
Complaints are voluntary, so 6 is a floor and not a count of affected cars. Mileages are typed in by owners and cluster on round numbers. And the mode itself is assigned by software reading the complaint text, which is reliable in bulk and fallible one report at a time.
Questions this page answers
At what mileage does misfire or rough idle happen on the 2004 Kia Sorento?
Across 6 owner reports that included an odometer reading, half were filed by 80,000 miles. A quarter were filed before — and a quarter after —. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is misfire or rough idle on the 2004 Kia Sorento?
6 reports have been filed with NHTSA, about 0.2 per 1,000 vehicles. Complaints are voluntary, so this is a floor rather than a count of affected cars.
What this is and is not. These are the mileages at which owners chose to complain to a federal agency, which is not the same as the mileage at which the part fails on every car. It skews toward failures that happened outside warranty, cost real money, or frightened someone. It is still the only public dataset that carries failure mileage at all, and the shape of a few hundred readings is informative even when a single one is not. Methodology · JSON · this failure on other cars
Source Owner complaints and recall records published by the US National Highway Traffic Safety Administration, model years 1996–2027 Figures rebuilt Published by AtWhatMileage How every figure is computed