Join Date: Dec 2005
Location: SE QLD, Australia
Drives: 2001 Kia Carnival 2.5L manual & 2000 Carnival Auto
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Carnival 2.5L KV6 Spark Plug change
These spark plug posts are all over the place.
With a lot of reading, and searching one can get a gist of what's required.
For the Carnival 2.5L petrol. KV6 variant.
I attach some extracts from the workshop manual.
The secret not mentioned, is to loosen/remove No.3 engine mounting until engine/oil pan drops down & rests on suspension cross arm.
This will enable contortionists to change plugs from underneath vehicle.
You will need two swivel socket extensions joined together and the standard sparkplug socket. If the plug leads are old, its likely you'll damage them flexing/getting out of the hole to clear the firewall.
Another reason to use Kia genuine parts in this instance, their expensive leads withstand the temperatures & flex longer...
My recommendation is to agree with everybody else & remove the air manifold.
For that, you really should get yourself a workshop manual to learn more about what is going on.
Again, you'll need to drop No.3 engine bracket at front belt side of engine.
This will facilitate removal of the back two retraining bolts holding manifold in place atop firewall side of cylinder head. Removal of the top obstructions ensures you have a clear working area, and less likely to damage items going in/out. More clearance to firewall.
You can also inspect the inside of manifold to see if oil buildup needs cleaning.
(minor oil spray comes in via the vacuum lines going to throttle body).
Spark plugs emerging with oil around upper body, or shock/horror, oil around the socket used, indicates a leaking camshaft gasket at either cover or the carrier sealant joint.(don't panic unless its major). Spark plugs emerging with a wet/oily spark plug electrode gap are an indication of more painful trouble, either with Cylinder head valves or head gasket.
And please, do not overtighten spark plugs into an aluminium block!
Family man with Kia Carnival 2001
KV6 petrol engine variant.
Rebuilds after years of using as a 4WD substitute...