Spark plug gap - Kia Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 15 (permalink) Old 03-26-2010, 06:04 PM Thread Starter
Newbie
 
Join Date: Jul 2008
Location: SW Georgia, USA
Posts: 9
Drives: 96 Kia Sephia, 04 Honda Accord
Gallery: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)

Thread Starter (Thread Starter)
Default Spark plug gap

The 'lil ol lady started idilng rough this morning and having no power on acceleration. Occasionally surged. This afternoon I cleaned the plugs; lots of grey sooty stuff caked on. The book said to gap them at .039-.043, which is much less than they were gapped at. I dutifully followed the book but the Check Engine light is now flashing.

After she cools, or in the AM, I'll gap them back out but it'll be a guess. The old girl has ~150K on her and burns a bit of oil. Suggestions on gap? I'll also change the fuel filter as I already have one. Air filter looks good. Any suggestions welcome.

Thanks!

Leam
leam is offline  
Sponsored Links
Advertisement
 
post #2 of 15 (permalink) Old 03-26-2010, 10:40 PM
Veteran
 
pistnbroke's Avatar
 
Join Date: May 2007
Location: UK a sad cold place
Posts: 1,047
Drives: 2006 3.5 Sorento 4x4
Gallery: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)

Default

Well the classical treatment for plugs that foul due to burning oil is to go to a slightly hotter plug ...be carefull you dont want pre igniton. You should of course change to a 20/50 oil and not the supermarket craap ...engine could do with a de coke by the sound of it
pistnbroke is offline  
post #3 of 15 (permalink) Old 03-27-2010, 02:25 AM
Memorial Super Moderator
 
pulsar86's Avatar
 
Join Date: Jul 2009
Location: Sunshine Coast,Queensland, Australia
Posts: 2,863
Drives: 2005 Kia Cerato LD [2L petrol] manual, 1986 Nissan Pulsar hatch
Gallery: 3
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)

Default

The gap is in the correct range [1.05mm] approx .040 in. If the car is burning oil then as pistnbroke has suggested try moving up the heatrange to a hotter plug[ 1 or 2 numbers] it will keep the plugs burning cleaner and go to a heavier weight oil. Unfortunately eventually you will have to bight the bullet and give the engine a rebuild.

TAKE YOUR TIME, THINK IT OUT, DO IT RIGHT, DO IT ONCE!! original quote by me as far as I know. :rolleyes:
ALL MEMBERS PLEASE FILL IN USER PROFILES. DETAILS HELP OTHER MEMBERS HELP YOU .

Last edited by pulsar86; 03-27-2010 at 02:27 AM.
pulsar86 is offline  
post #4 of 15 (permalink) Old 03-27-2010, 07:03 AM Thread Starter
Newbie
 
Join Date: Jul 2008
Location: SW Georgia, USA
Posts: 9
Drives: 96 Kia Sephia, 04 Honda Accord
Gallery: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)

Thread Starter (Thread Starter)
Default

Quote:
Originally Posted by pistnbroke View Post
Well the classical treatment for plugs that foul due to burning oil is to go to a slightly hotter plug ...be carefull you dont want pre igniton. You should of course change to a 20/50 oil and not the supermarket craap ...engine could do with a de coke by the sound of it
pistnbroke, what's a de coke? Far as I'm concerned, if the old gal can last another 10 years I'll do my best. Just trying to afford the stuff I can't do myself, and learn to do the things I can.

She's about due for an oil change anyway, so I'll move to 20W50 and see if that helps. I've been putting some thickner stuff in with the 10W30. One mechanic suggested I add transmission fluid as well, to stop some issues.

Thanks!

Leam
leam is offline  
post #5 of 15 (permalink) Old 03-27-2010, 03:52 PM
Memorial Super Moderator
 
pulsar86's Avatar
 
Join Date: Jul 2009
Location: Sunshine Coast,Queensland, Australia
Posts: 2,863
Drives: 2005 Kia Cerato LD [2L petrol] manual, 1986 Nissan Pulsar hatch
Gallery: 3
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)

Default

A decoke used to be quite a regular thing to have to do in years gone by on all cars[ because of better engine tech, fuels and oils now it isn't done much], it is opening up the engine and removing any buildup of carbon [ coke ] on the pistons and head. I think maybe the mechanic that suggested the ATF might be thinking along the lines of softening any buidup and carrying it away, but it would produce some extra smoke.

TAKE YOUR TIME, THINK IT OUT, DO IT RIGHT, DO IT ONCE!! original quote by me as far as I know. :rolleyes:
ALL MEMBERS PLEASE FILL IN USER PROFILES. DETAILS HELP OTHER MEMBERS HELP YOU .

Last edited by pulsar86; 03-27-2010 at 04:30 PM.
pulsar86 is offline  
post #6 of 15 (permalink) Old 03-27-2010, 05:11 PM
Super Moderator
 
ron1004's Avatar
 
Join Date: Jun 2005
Location: Louisville, KY
Posts: 4,704
Drives: Kia Elan
Gallery: 13
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 58 Post(s)
Garage

Default

I suggest doing a forum search, and you'll find a few reports of misfiring with the plugs set at what can be found in some documentation i.e. 0.040"

Kia Forums is a forum dedicated to Kia owners where they can have discussions on specific Kia models, get the latest news, and post images of their vehicle. - Search Results for plug gap

There seems to be consensus that the smaller gap of around 0.028 ~ 0.030" may be better and in some cases get rid of a misfire problem.
No harm in trying the smaller plug gap if experiencing misfire problems.

Quality and not quantity counts.

Sig image is 500X100 at 11.7 kb
ron1004 is offline  
post #7 of 15 (permalink) Old 03-27-2010, 08:52 PM
Super Moderator
 
DavesSpectra's Avatar
 
Join Date: Jan 2010
Location: Massillon, Ohio, USA
Posts: 5,138
Drives: 2007 SpectraLX, 2006 SpectraSX, Kubuntu
Gallery: 0
Mentioned: 2 Post(s)
Tagged: 1 Thread(s)
Quoted: 149 Post(s)

Default

With 150k miles on it you might have a catalytic converter that is plugged up causing restriction in exhaust gas. I've read about a few KIAs that acted just as you described.
It seems to come on very quickly. If by disconnecting the exhaust before the cat the car runs good (but noisy) you've found your problem.
Just one more thought to try.
Dave
DavesSpectra is online now  
post #8 of 15 (permalink) Old 03-27-2010, 10:13 PM Thread Starter
Newbie
 
Join Date: Jul 2008
Location: SW Georgia, USA
Posts: 9
Drives: 96 Kia Sephia, 04 Honda Accord
Gallery: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)

Thread Starter (Thread Starter)
Default

In this case the problem came on quickly. I've cleaned the plugs and gotten the one bad misfire taken care of but I think that's only a band aid. I need to take care of the fuel filter, since I already have one, and try some different gaps in the plugs until she runs well. That's tomorrow's work. Then heavier oil and hotter plugs if things still aren't taken care of, or in the near future even if they are. Air filter is good.

Dave, I'll see if I can find the cat and try that idea. Thanks!

Leam
leam is offline  
post #9 of 15 (permalink) Old 03-27-2010, 10:27 PM
Veteran
 
Join Date: Dec 2005
Location: Winchester, Calif
Posts: 1,878
Drives: 2003 S-10 Had an 03 LX 3.5 Sorento
Gallery: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)

Default

Years ago, before Cats, I would have my partner run a car up on the dyno, 60 MPH, put a load on it and then cI would carefuly pour ATF into the carburetor. The carbon would fly out of the engine. It would alternate from brown smoke to white. After that I would squirt some H2O in and more would come out. For sticking valves I would recommend a qt of ATF in the gas tank. That was then. If you put anything into the intake of a modern engine or gas tank be sure its compatable with the 02 sensors and Cat.
nstoolman1 is offline  
post #10 of 15 (permalink) Old 03-30-2010, 05:18 AM Thread Starter
Newbie
 
Join Date: Jul 2008
Location: SW Georgia, USA
Posts: 9
Drives: 96 Kia Sephia, 04 Honda Accord
Gallery: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)

Thread Starter (Thread Starter)
Default

Still having the issue. The local AutoZone folks did th eOBD thing on it and it reported Cylinder 3 mis-firing. So I swapped plugs between #2 and #3, pulled th enegative ground off for a moment to reset things, and it still shows cylinder 3 misfiring.

She only has trouble getting up to speed, and will surge occasionally. Haven't been able to find th efuel filter or identify the catalytic converter. At this point it seems to be time to take her into the shop and let a real mechanic look at her.
leam is offline  
Sponsored Links
Advertisement
 
Reply

  Kia Forum > KIA Models > Kia Sephia Forum

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Kia Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On