How do I change the spark plugs on a 04 sorento LX? - Kia Forum
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#1 (permalink) Old 04-05-2010, 06:11 PM
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Default How do I change the spark plugs on a 04 sorento LX?

I have a 04 sorento LX 3.5 V6 2WD with 140000 Miles. We bought it with 104xxx miles and never changed the plugs. all of a sudden its starting to smoke and make more engine noise then usual, so i figured its gotta be the plugs. any idea on how to change them? Im use to working on my Honda and Kia's are uncharted territory for me.
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#2 (permalink) Old 04-05-2010, 06:37 PM
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Originally Posted by Mr.Sorento View Post
I have a 04 sorento LX 3.5 V6 2WD with 140000 Miles. We bought it with 104xxx miles and never changed the plugs. all of a sudden its starting to smoke and make more engine noise then usual, so i figured its gotta be the plugs. any idea on how to change them? Im use to working on my Honda and Kia's are uncharted territory for me.
I would not automatically 'assume' the plugs are the problem.


I would take the time to perform an educated diagnostic.


smoke & a noisy engine is not a good combination. does it do this upon initial startup ? all the time ? only once warmed up ? what kind of noise ? what color smoke ?

the 3.5 is a pretty bullet proof engine block / cylinder heads combination, but there are ancillary issues around the engine that can be considered: intake manifold butterflys, crankshaft damper pully bolt, hydraulic lash adjusters, oil filter & oil quality / viscosity, etc, etc, etc...
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#3 (permalink) Old 04-05-2010, 08:05 PM
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Originally Posted by Mr.Sorento View Post
I have a 04 sorento LX 3.5 V6 2WD with 140000 Miles. We bought it with 104xxx miles and never changed the plugs. all of a sudden its starting to smoke and make more engine noise then usual, so i figured its gotta be the plugs. any idea on how to change them? Im use to working on my Honda and Kia's are uncharted territory for me.
I agree with him many things other then plugs. Not enough info to make any valid comments other then this.

1)Classic plugs going bad and if you use the owners manual as a guide. 100,000 mile DOUBLE Platuims were in there. They will never last that long. So buying one with 104,000 on it sight unknown and going till 140,000 you do the math. If they were to be going bad BLACK SMOKE and PINGING or rattleing form not fireing cyls.

2)With a vech and 140,000 on it. Other things that mask it all or mimic that. BAD INJECTORS (Black smoke). Bad rings (blue smoke) burning oil/fouling good plugs. Clogged Fuel Filter (messing up good injectors pulse). Blown head gasket (white smoke/rattle). Clogged air filter (running rich/hense smokeing). Bad coils and or wires. Vaccum leaks. Bad brake booster.
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#4 (permalink) Old 04-06-2010, 12:36 AM
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do you have a diagnostic light on ? I suspect your butterflys in 5 and 6 have disintegrated and fallen into the engine ..if you have any warantee use it ..See my recent post on maintanence issues

i dont think the plugs are the issue .they either work or they dont and you get a misfire not rattle and smoke ..we have posts on them not being changes at all up to 250 000 miles

Blue smoke ??? White smoke ?

Last edited by pistnbroke; 04-06-2010 at 12:40 AM.
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#5 (permalink) Old 04-06-2010, 10:15 AM
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Originally Posted by 04SorentoLX View Post
I agree with him many things other then plugs. Not enough info to make any valid comments other then this.

1)Classic plugs going bad and if you use the owners manual as a guide. 100,000 mile DOUBLE Platuims were in there. They will never last that long. So buying one with 104,000 on it sight unknown and going till 140,000 you do the math. If they were to be going bad BLACK SMOKE and PINGING or rattleing form not fireing cyls.

2)With a vech and 140,000 on it. Other things that mask it all or mimic that. BAD INJECTORS (Black smoke). Bad rings (blue smoke) burning oil/fouling good plugs. Clogged Fuel Filter (messing up good injectors pulse). Blown head gasket (white smoke/rattle). Clogged air filter (running rich/hense smokeing). Bad coils and or wires. Vaccum leaks. Bad brake booster.
The color of the smoke is whitish grey. It rattles while we drive only while my foot is on the excelerator. No CEL light as of now, it first started smoking when we were headed to san deigo after going though some steep mountain sides i let off the gas and a huge puff of smoke came out, then after i go tto san diego while idling it would throw small amounts of smoke then it stopped. now 7 months later its doing it again but now it does it when it warms up and the exhaust smells very rich. I dont belive its the head gasket due to it never overheating and the oil looks great and is not creamy looking.

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Originally Posted by p_mori7 View Post
I would not automatically 'assume' the plugs are the problem.


I would take the time to perform an educated diagnostic.


smoke & a noisy engine is not a good combination. does it do this upon initial startup ? all the time ? only once warmed up ? what kind of noise ? what color smoke ?

the 3.5 is a pretty bullet proof engine block / cylinder heads combination, but there are ancillary issues around the engine that can be considered: intake manifold butterflys, crankshaft damper pully bolt, hydraulic lash adjusters, oil filter & oil quality / viscosity, etc, etc, etc...
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Originally Posted by pistnbroke View Post
do you have a diagnostic light on ? I suspect your butterflys in 5 and 6 have disintegrated and fallen into the engine ..if you have any warantee use it ..See my recent post on maintanence issues

i dont think the plugs are the issue .they either work or they dont and you get a misfire not rattle and smoke ..we have posts on them not being changes at all up to 250 000 miles

Blue smoke ??? White smoke ?
no CEL light and its not showing any signs of a loss of power, it still runs great other then the smoke.
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#6 (permalink) Old 04-06-2010, 05:19 PM
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no cell light is good news ..your plugs are not misfireing so dont change them and your butterfly system has not decended into the engine ..well if it had it would be unusual to not bring the cell light on for a misfire. Black smoke is burning oil.....if you acccelerate hard for say 30 sec say up hill and then take your foot off does it produce clouds of smoke ?? if it does its valve guides....
check if its using water and check your fuel consumption ..... If the air is damp cold you can get clouds of water vapor not seen on a hot summer day....
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#7 (permalink) Old 04-06-2010, 08:35 PM
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Without seeing the plugs I would hazard to say there is a slight possibility that the plugs are worn down so much as to have a large gap. Not enough to misfire but possible cause predetonation. (Pinging) My 03 manual recommended 60,000 mi replacement interval. I believe they were Champion RC10PYPB4. I put in the NGK Iridiums. Jmho.
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#8 (permalink) Old 04-07-2010, 12:00 AM
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common mistake Nstool man ....pinging ( pinking in UK) is caused by too early ignition ..pressure is too high and the end gasses explode hence the noise...you cannot get than on a sorento as it has a knock sensor and that retards the ignition.

Pre igniton is caused by glowing particles of carbon on the head etc ...its silent and usually 11 seconds of pre igniton will put a hole in the piston .....so its not that .....
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#9 (permalink) Old 04-07-2010, 04:23 PM
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one possibility is you lost a head gasket, cast iron block alum head different expanision and contraction when heated and cooled

that is why the take up is done on "sliding of the gasket surface" either on the block or the head, supposedly the head

when it can not slid on the head any more the head gasket fails in the center and leaks coolant into the cylinder and you get white/gray type of smoke

i have done may of these you can't see where the gasket fails, but if you look at the effected cyl spark plug it will be a much different color than the rest

alum head/ iron block cly head gasket surface polish is critical to how long a head gasket will last and some apps use "strech use once head bolts" the torque is so critical

leaky head gasket, just a guess on my part, done so many, glad in am retired and don't have to do any more !
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#10 (permalink) Old 04-09-2010, 06:36 PM
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Like I said and no matter what you think did or did not happen in a split sec that you missed. The following is true for early sorentos coolent tank issue and low coolent means NO coolent on sensor to tell you it was over heating has to be in the bath to tell you the water is hot. Not a air sensor.

Black smoke is a rich fuel issue weather caused by clogged air filter or bad injectors or weak spark form wasted plugs and hense flooding eng with badly burning gas.

Blue smoke is a oil issue weather caused by oil fouled plugs due to valve guides or merely burning oil form bad or worn rings or wrong oil. We are told to use 5W20 by KIA. If you used that forever then not much chance of rings or guides. If you used it all of a sudden NOW on a high mile worn eng then yes you might have caused ring/guide issues. were you using 10W30/40 before? If you as well switched form DINO to SYNTH this is even more true. And a long trip will break things loose and ugly head of problems will show up.

White smoke is a water issue weather head gasket or other. The fact that it does it only once in a while and not alot is very classic of a inpending issue. Eng gets hot and water seeps in thru crack in castings now under peak pressure situations. Or head gaskets leak only rarely. Like under a long trip with A/C on in hot weather and elevation changes. Full blown head gasket or cracked block/head will be massive white smoke once hot and under any pressure. That is when the oil looking like bad coffee and coolent looking foamy as well as cap seal being oily shows up.
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