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Re: Misfire - looking for suggestions [Re: Dryver] #1018134 02/03/11 05:34 PM
Joined: Feb 2009
Posts: 229
londart Offline
[quote]A: Maybe. A spark plug part number might fit hundreds of different engines from many different manufacturers. Although the NGK factory will set the gap to a pre-selected setting, this may not be the right gap for your particular engine. The incorrect plug gap for your engine can contribute to a high rate of misfires, loss of power, plug fouling, poor fuel economy, and accelerated plug wear.

This is the reason we usually recommend using OE manufacturer for plugs...in our case ngk which has a preset gap of 11mm or .43-.44 which is what is recommended for our engines <img src="/forums/images/graemlins/cheers.gif" alt="" />

Auto Parts Professional
95 sportage sold but not forgotten
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Re: Misfire - looking for suggestions [Re: londart] #1018135 02/03/11 08:18 PM
Joined: Feb 2009
Posts: 146
Dryver Offline OP
Interestingly enough, there is conflicting information on Kia Tech Info.

If you look up the repair procedures under the Engine Electrical System/Ignition System/Spark Plug for the 2001 model year (and maybe others, too), at one point in the "installation" section it states that the gap should be 0.039-0.043. It also states this in the specifications.

But further down in the inspection section, it states the gap should be 0.028-0.031.

I saw a moderator on another Kia forum recommend .030, so I went with that for now. If I open it back up again at some point, maybe I'll gap it back up to .042 and see if it still runs smooth.

01 Convertible; Electric Fan; 3" Up Your Kia lift spacers; Tj 104's; 31x10.5x15's on Centerlines; Rear LSD.
GONE, all I have left are a few spare parts and the wheels.
Re: Misfire - looking for suggestions [Re: Dryver] #1018136 02/04/11 07:23 PM
Joined: Dec 2009
Posts: 433
Sportege_Panicmech Offline
I'd imagine a smaller gap would run smooth, but not as powerful. A larger gap would be powerful moreso, but risking misfire or rougher run underload??? this is my guess. Anyway. Mitchel1 OnDemand at the shop I work at confirms .039-.043. I can also attest Londart's Credibility. He's our parts guy at the shop.

Re: Misfire - looking for suggestions [Re: Sportege_Panicmech] #1018137 02/05/11 07:35 AM
Joined: Mar 2002
Posts: 4,497
Axe Man Offline
Kia Moderator Emeritus
The correct gap is indeed 0.039 - 0.043 (1.0 - 1.1 mm). I would re-gap them back to the correct spec.

If the misfire returns and the replacement/swapping of the coil packs and plugs haven't fixed the issue it's time to look for other causes.

If you are finding oil on any of the plug threads replace the valve cover gasket. Perform a compression test on all the cylinders. They should be within 10% of each other.

Other possible causes: Bad fuel injector (not very common), cracked exhaust manifold (very common). To see if the manifold is cracked remove the heat shield surrounding the O2 sensor.

1998 Sportage - Gone.
2004 Honda Civic Coupe.
2007 Suzuki Grand Vitara - She got it.
Re: Misfire - looking for suggestions [Re: Axe Man] #1018138 02/07/11 09:56 PM
Joined: Apr 2002
Posts: 1,221
logansportage Offline
Body Damage is Cool
A trick I learned to check if you have micro cracks or a leak in the gasket for the exhaust or intake manifold is to spray carb cleaner or starting fluid (ether) in the area around the exhaust or intake manifold. It is highly advisable to do this when the engine is cold and just started. When it gets warm it works too, but you need to be careful not to use too much because you can cause a fire. Carb cleaner and ether are not as flammable as alcohol and will plug the crack for a second or two. This gives you enough time to see if it starts running smooth again.

Logansportage <img src="/forums/images/graemlins/patriot.gif" alt="" />

White 1998 4 door KIA Sportage 4x4 w/Eibach 2.5 spring lift and TJ rear coils, 4crawler 1.5 body lift, Monroe Sensa.trac shocks, Bosch 4+ plugs, Eaton LSD, 31x10.5x15 BFG KM tires, 2.5 cat back exhaust w/SpinTech muffler
Re: Misfire - looking for suggestions [Re: logansportage] #1018139 02/08/11 09:14 AM
Joined: Dec 2009
Posts: 433
Sportege_Panicmech Offline
my xhaust mani is cracked, and has a small buildup of black around the crack, but it's been this way since I've owned it. runs great. Crack isn't big enough to cause any noticeable exhaust leak noise. (ie: pfft pfft pfft) ya know..

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