[drtummin]

Has anyone notice this ? At start up there is a lot of Black exhaust coming from the tail pipe. The weather is cold here this time of the year on the east cost of Canada, I Did notice it sometime ago when it wasn't as cold.....Is this normal..........Tks jim

 

[drtummin]

Thanks Tripplec.. for your reply that's what I was planning on doing

 

[drtummin]

Get it checked for codes etc. Black normally is a result of way too much gas or lack of air. Very rich mixture.

It can mess up the catalytic converter so don't run it too much or you'll need a replacement.

Not getting any warning engine lights showing

 

[drtummin]

Normally if you are getting black smoke out the tailpipe, there would be a check engine light because the delta between the fore and after O2 sensors would be way off. Is there soot inside the tailpipe? Obviously the dealer is the best place to get this addressed ASAP.

Thanks Tom. for your reply I was thinking the same thing, if there is no codes showing / engine light it would be very hard to guess which sensor is acting up.. I was told there are about 6 sensor under the hood that may cause this including the injectors & air filter which has been replaced

 

[drtummin]

Agree with posts above. Black smoke, if that's really what it is, is typically indicative of a seriously over-rich mixture. The ECU will always try to manage fuel trim to prevent this, and if it cannot, the forward O2 sensors will be driving the ECU to the far limits of the fuel trim tables and a code will appear as a result.

During cold start, the engine is allowed (in fact, is expected) to run a bit rich and a bit high in RPM, but is not normally enough to cause 'black smoke' as a result, even if the catalyst isn't up to temperature enough to burn off any remaining hydrocarbons in the exhaust.

Like others, I'd be interested in a video if you can get someone to take one while you perform a cold start and wait whatever time until the 'black smoke' subsides. How long is this time, typically?

Hi Acanderson...Thanks for you input...Time is about 2 min; before 'Black Smoke Subsides & that from a cold start up. Going to give the Map Sensor & cleaning & see if that helps

 

[drtummin]

It should throw a code if the ECU detected anomalies. If the issue persist it should show the code sooner or later. For the meantime you need to make a quick remedy otherwise just wait. If it happens to me, I will do some quick actions such as; 1) add fuel injector cleaner. 2) Change oil into thinner specs 3) use mid grade or premium gas. Good luck!

thanks Spicy for your input..I've ben thinking along the same line, just waiting for my gas tank of fuel to get a little lower so I can fuel up with a high grade of fuel. Also have be using Lucas Fuel additive for some time ..I personal do not give much for these prod; because todays fuel do have it own additives that do the same job

 

[drtummin]

Stop using the Lucas additive. Isn't needed at all with any name brand gas!! It could be the cause as no additive is advised full time and complicates assessment. Modern gas from Shell, Mobil have highly engineered additives standard as do other Top Tier Gas brands.

Tks Tripplec for you input...
What you are saying has been bunch around for yrs. some say yes some say no needed, in the passed I've never used it & again I thinks it depends on what fuel one is using Gas today is purchase from many parts of the world depend who has the a ship load & the Price $$ just read a article that Gas shipped to the east cost of Canada was purchase from Russia ..Yes Shell & Mobil Do Add there our additives to there high octane gas...Also on page 7/10 of my manual it say's "" Fuel additives Add every 12000KM (7500) or 12 months """ so which I done to this tank of fuel I add about 10 oz of Lucas let see if it makes any differences.. I'm skeptic when it comes to this stuff

 

[drtummin]

Many folks in the US don't like Lucas products, but the high Amazon reviews suggest that they're good.

A few car manufacturers recommend Techron, including Kia, but its debatable what level of confidence that should add.
I seldom use it because I exclusively use Costco Top Tier Gas.

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Hi Ron ..Never heard of that brand of additive but will take your advise for the future if needed. ..like I said it's only one tank of fuel.. I also buy my fuel from Costco but just the 87 octane.. Again Costco buys there fuel from different suppliers depending were there pumps /warehouse is located & the were tank farm are not sure if Costco has higher spec; for there fuel ..but I will be trying there Higher brand on my next tank..

 

[drtummin]

If possible, fill with with the vPower Shell (premium) stuff for a few tanks. The additive they use is considered pretty good by folks in forums such as Bob is the Oil Guy, etc. Cycle a few tanks of it through once in a while. The octane is of no use but the additives (and I dare say lack of ethanol) will help a bit.

Thanks Octavian...for you suggestion, that is my plan using a

 

[drtummin]

Black smoke coming from a newer vehicle like this.. hmm. Yeah, you can put higher-grade fuel in it, but unless you've been putting complete junk in your tank (which is almost certainly not the case), I would not think this is related to the fuel system. I would suspect an air blockage somewhere. At the very least, take the undercover off and see if a furry critter has built a nest up in there. Also, take out your air filter and check it out. When is the last time it was changed? Might be a leaf or nest caught up in there too. I would really go through the entire air intake (which is not difficult) before spending any money on premium fuel or fuel additives. There's a hole in the front of the car which is the start of your air intake.. locate it, and just make sure the air intake pathway is clear all the way to the throttle body (and clean the area of the throttle body where the throttle plate sits). If you find that it's not related to air intake, then I would take it to a pro mechanic.

Thanks Ecanderson for your suggestion.. First thing I checked was the air cleaner it looked good, so did the bottom of the air box & was very clean,..Next morning I remove the air filter before starting it up ..still black smoke for about a min; approx'.Car runs smooth all the time...there are 2 sensors in the intake tube just after the air cleaning I will remove that flex intake tube & spray those two sensors with cleaner & see if that makes any differences, I don't notice any differences when driving except I'm not getting the same millage now when it COLD which is normal ..I will take the front air intake off to check for blockage but I'm guessing that not the issue... After the holiday season I'll contact the Kia dealer to see if there is a issue with this car, unless there are engine light showing they will not touch it .I'm guessing that what they will say...Tks again

 

[drtummin]

Take a video, post it here and present it to Kia for them to take action without the need for a stored error code.

Intake restrictions would need to be significant to have any impact on engine performance, and this smoke is happening at high idle which means the air flow is really low - intake restrictions that could effect the idle air flow would most certainly become very prevalent at high engine load.

I'd avoid spraying any solvents on the delicate sensors, unless there's diagnostics that point to them, and in that case it would be a warranty issue best left to Kia to diagnose and replace.

The black smoke at start-up will have a long term impact on the life of the engine and CAT's, so don't let it drag on too long.

Thanks Ron..
For this advise will try and get that video today, there is a fresh blanket of snow down so it will show up better with the white back ground.. Also will hold of spraying any cleaner on sensors until I have a chat with Kia.. back to air restriction you mention if I had the air filter out @ start up would the engine be taking in a full amout of air.. Are are you saying that there could be a restriction after the trottle body/ Air filter housing??....Tks again

 

[drtummin]

No, I'm not suggesting that there's an air intake restriction - an intake restriction anywhere in the system will also manifest itself at high load when the air intake flow is high.

There's no point in removing the air filter for a cold start - the engine will only ingest the "full amount of air" at high RPM & High Load.

Post a photo of each side on the air filter.
How many miles and months on the air filter?

I trust you're starting the engine without touching the accelerator?

The air filter was replace @ around 30000K now there 38000K that was done about 7 month's ago

One can't start the SUV unless foot is on the Brake it's a push button start

 

[drtummin]

Unless you encountered some freak event that caused it to ingest a slug of crap, that air filter would be as good as new, but no harm in checking it.

Push button start, then its starting at near zero throttle, low air flow, etc. , so its a sensor or injector leaking into the cylinder when the engine is shut off, ........ a few potential issues which can only really be identified using diagnostic equipment.

Prior to the cold start you could pull the plugs and look into each cylinder for signs of fuel, or shut it off a couple of seconds after the cold start then pull the plugs and look for a black one, then you'll know if its just one cylinder and which one.

Thank again Ron for your input...At start up it raves up about 1000 rpm,so it's not starving for air or fuel that way... but will double check that # in the morning.. Never though about checking a Plug will do that..But if there is black smoke, then there has to be dark color plugs as well would you think??? what I will do tomorrow start & run it for a few min; then shut it off for the same period of time & try again to see if it does it that may say something.................