memphis_vette

hey guys i ordered some MSD Super-Conductor spark plug wires along with a set of NGK TR55 plugs. i took my old cheap brand wires and Ac Delco Iridium plugs out that have approx 40k miles. they have oil on all plugs except one that was on drivers side.

here are the pics

got them from ccperformance.com for $68 shipped for plugs and wires


these are what all the plugs look like. driver side left, passenger side right


here is driver side


here is passenger side


close up of what all but 1 plug looked like


here is the one plug with no oil on it. came from driver side on the front cylinder of car.

lucky131969

If it was missing....you do have a cracked plug.

memphis_vette

yes i did notice there was one plug with the ceramic part cracked. i did notice it would miss very slightly at idle. but the car has ran fine.

memphis_vette

so now with the new plugs and wires...do you think i will be ok. nothing major?

memphis_vette

any other insight?

dbaker

Looks like oil on the threads..might be a gasket leak?

The pics were fuzzy,but looks like mostly normal wear.The post didn't say how old the plugs were or how many miles.

Good choice of wires & plugs.I prefer & run NGK coppers in all my rods.

Check out this chart.

http://www.verrill.com/moto/sellingg...colorchart.htm

\db2
Carolina

memphis_vette

ive had a small oil leak but im not sure from where. the plugs are about 2 years old and 40k miles.

memphis_vette

My car idles very poorly now and sounds like it's missing. My car has a mail order tune by ecs. Could switching from ac delco iridium plugs to ngk tr55 plugs cause that issue. Or could a wire be messed up?

Armycop

Check your plug wires again. First, make sure the plug ends on the capacitors are snug and tight. Listen for a "click" when you push the boots onto the plugs; they should fit snugly on the plugs. Once you're sure the plugs are okay, fire it up and see if that works. The NGK's are good plugs, should last a long time.

memphis_vette

i double checked everything. all snug and tight. the car runs good when cold but once it is warmed up it idles low and surges. kinda of wants to die

099blancoss

vacuum leak, pcv or one of the tb hoses? If it was a wire or plug it would miss all the time not just some of the time.. I would think ? but that would show at startup as well too you would think. How old is the tune? Was the issue there before ?

Millenium Z06

you should not have oil on the threads like that and the one plug in the pic that is cracked would not have caused that and could have been cracked removing it.
The plug tips themselves look somewhat normal to worn or like they have had oil burnt on them, need a better pic to be sure.
You 1st need to find out why you have oil on the threads; if you torqued the new plugs correctly, pull one out and see if it has oil on it too, if so does the car smoke?
seems like you may have a little oil getting into the cylinder possibly thru the valve guides past the seals.
Get a better pic of the electrode and see if the new plugs have oil on the threads, they should be dry. How many miles on the engine?

memphis_vette

car does not smoke at all. car has 145k miles its a 98 A4 coupe

my tune has about 5-7k miles on it

lespaulr0cker

Here is my "spark plug" post with pics showing what my old plugs looked like for comparision.

http://forums.corvetteforum.com/c5-t...lug-gurus.html

memphis_vette

thx for the post

Millenium Z06

Then I'm guessing you've got some valve stem seal issues. There should not be any oil on the threads like that esp that much. Your tips also look like there is burnt oil on them.

memphis_vette

ok so what all should i replace while im tearing into the motor?

Corvette Don

Those plugs have normal wear on them, that does not look like you are "burning" oil.

memphis_vette

but they never used to be like that so why now?

Millenium Z06

This is what a normal use spark plug looks like:


Either way, there should be no oil on spark plug threads unless it is seeping in.
BTW, my spark plugs are dry and the porcelain tip is mostly lite-lite brown with a reddish brown tint from fuel additives.

normal plug:


Yours dont look like this at all, something is wrong.