captain vette

Hello guys, my knew to me 2011 GS have around 30k actually it is in winter storage in my garage i was wondering if it was a good idea to put knew plugs on it as a preventive move. I know there's maintenance schedule on the owner's manual but i would like to hear from you if it is a good idea or just overkill. PS what brand of spark plugs are you guys using Thank you.

Vet Interested

Overkill replacing the plugs but I know the feeling. I can relate. I pulled mine at 40,000. They looked new. I also replaced the wires...just to spend money.
I did do mine because I had a slight miss. Still do.

919cw313

If you want something to do, change the coolant, brake (& clutch?) fluid, cabin air filter, etc. Your plugs are fine.

Or supercharge it.


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cgladish

i changed my plugs & wires at 135k miles. that was only because I felt that it was over due.
car was running fine, mileage was still good too.
one of the plugs was missing its electrode though, the remaining ones looked ok. most were worn a bit.
the wires looked good, until I pulled one off and it was dry rotted.
my first car ( '64 cutlass in 1980 ), I was changing the plugs, wires, points, condenser and cap every 3k miles ( oil too )!
it appears that we've progressed a bit since then. almost to the point where it easy to forget about it.

windyC6

Only reason to change your plugs that soon would be if your worried about them getting frozen in the threads. Doesn't happen often, but it can. And if your removing them just to check for that then one might as well consider replacing them. Bottom line....won't hurt....but no real need changing them.

extrapilot

May want to pull plugs just to get a idea how the engine has been running so far, get a heads up on anything that could be a issue, much like having the oil sent out to be analyzed. I would also just re-install them, not much need to replace them as such low mileage.

jaredtxrx

and tires if they are original. make sure they are cracking and such.

C6_Racer_X

I'll agree you might want to inspect the plugs, just to see what's going on now. Also, put a small dab of anti-seize on the threads before reinstalling them, so they don't seize up in the head.

You might want to replace the plug wires as well. It's likely the boots have stuck to the plugs. You may damage/destroy the wires trying to pull the plugs out. That's not uncommon. Lube the boots on both ends of the plug wires with dielectric grease when you put the thing back together. Again, this is to keep it from sticking together and make future disassembly much easier.

If you really want to replace the plugs, these engines use AC-Delco Iridium plugs. They are rated for at least 100,000 miles. My general experience with GM engines is that they tend to run poorly with anything other than the original AC-Delco plugs. YMMV, but for a once in 100,000 miles expenditure, I'd go with AC-Delco.

FAUEE

Agreed.

The Clevite Kid

Had to throw away some quality Non AC-Delco plugs because they caused other problems. Stick with the AC-Delco iridium plugs.

WW7

Ever hear the saying ( If it aint broke,don,t fix it) . If the car isn't missing or running badly leave it alone, those AC Delco plugs are good for 100,000 miles just like they claim.....WW
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Powershift

This has been stated in other C6 threads about spark plug wires.........but for factory type wires, you push on the spark plug until you get one click to make it secure. But when you push the wire on the coil pack, you need to push to get two clicks to make it secure.

FWIW.

Larry

Kenny94945

See post 5.

Wear can be minimal at 75K, wear at 30K probably zero.

windyC6

If I may be so bold....what other problems would/did the off-brand plugs cause ??........

Kurt D

Some people have reported charging system codes from NGK copper plugs in C6s. There's a thread on here about it. I think it was chased down to the copper plugs having more resistance, requiring more energy for the coil to fire depleting the coil's reserve quicker. The PCM reduces the alternator output at idle to save fuel and at that level the system has trouble recharging the coils (or at least cause a volt dip the PCM sees). I believe the fix was to increase the alternator output at idle rpms in the tune. Newer GM PCMs seem to not like charging abnormalities at all; C6s doubly so. Just look at all the codes and issues a weak battery can cause.

Don-Vette

2010 GS Since new 48,000 miles. Did MSD wires years ago. No plugs yet,I may pull them just to put Nickle Never Seize on the threads or put in a new set.

flyeri

It's not the same engine of course, but a coupe years ago I replaced belts, hoses, coolant, plugs, idler and tension pulleys on my LS truck engine at 100,000 miles. The plugs looked as good as the new ones I was installing. In fact I gapped the new plugs per GM specs and then measured the gap on the old ones. The old plugs had less gap than spec. If it were mine, I would not touch the plugs unless you are experiencing some issue. These LS engines will go a long time and many miles with little attention beyond regular oil changes and a fresh air filter every year or so.

449er

Those factory plugs are good for 100k+, don't waste your money

windyC6

Interesting to be sure. Kinda sounds like my Harley. I spotted for some high dollar plugs once and come to find out that they may cause a code to be flashed if you don't shoot the computer some new software. Go figure.

RobJoy

Checked spark plugs at 55k miles when had the LS-3 cammed. One OEM iridium plug had the tip burned off. Replaced the set with ACDelco (as I recall).