Sounds like an old clunker at cold start for about 15 seconds until it normalizes. They do things at cold start like resitrict airflow, partially close exhaust valves, etc. The car surges a bit backing out of the garage. P050D Description During a cold start, the Engine Control Module commands dual-pulse mode during Open Loop operation to improve cold start emissions.In dual-pulse mode, the fuel injectors are energized twice during each injection event. It’s purpose is to supply the engine with additional fuel to enrich the fuel mixture in cold temperatures where air density is increased and additional fuel is required. I would turn the key to start but when I let go, the car engine died, never turning over. While there are a variety of reasons your Kia Optima has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil. The free roadside assistance towed it to the dealer who gave my an encyclopedia of recommendations to the tune of about $2K including replacing the license plate light bulbs due to dimness. It is somewhere in the middle it seems a bit rough. My way of avoiding that is to start it with the shift lever in gear, which defeats that PZEV cold start weirdness. Initial RPMs are fine and once the RPMs are at the final resting place it is fine. My idle is a bit rough at start up as well. Kia Motors America provides a wide range of cars that meet your lifestyle. if you have an outside temp display on the car, and it's halfway near normal, that's probably not an issue, I think they all piggyback off the same sensor. Kia Forte Rough Idle Causes. Would not start and after several sensor changes for P0016, it seems most likely to be a timing issue. When one or more of these variables is off it can lead to a rough idling condition. Average failure mileage is 38,200 miles. Check out what some owners had to say! Have 2012 Kia Sedona van that has lots of knocking noise on start ups and cold take offs. if it still acts like crud, another thing to think about is the air intake temp sensor if equipped. Browse our luxury or sports sedans, hybrids, electric cars, SUVs, minivans & hatchbacks. After I had both the fuel injector and the ignition coils replaced, it would start. I asked Kia dealer about: They agreed heard the n … read more Most of the time the culprit is going to be the ignition system, although there are a myriad of other causes. what I'm thinking is that if a warm engine starts on a cold morning and runs decently, that seriously implicates the coolant temp sensor. But after two days it started rough, if at all, the engine only coming on if I held the ignition for half a minute or so without stepping on the gas. It seems like an occasional rough cold start could just be a characteristic of some of the Kia and Hyundai engines? Hopefully, the check engine light is on. It's a manual transmission. The 2013 Hyundai Elantra has 16 problems reported for runs roughly, shaking and vibrating. Hyundai and KIA car owners with the 2.4 engine cited various problems including the timing chain. Hello, I have noticed my 2019 2.0 seems to a bit of a rough idle patch when coming down from the initial high RPM of start up. Owner Number One “My 08 Sonata with the 2.4L engine was towed to the dealership. You should hear my 08 Subaru. The cold start injector, also referred to as the cold start valve, is an engine management component found on many road going vehicles. More and more now even when engine is warm and accelerating. Our 2005 Tucson GLS 2WD started hesitating and quit on my wife about a week ago. We’ll cover the most common causes of rough idle below.
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