: spark plugs



torogt
03-24-11, 08:09 AM
Getting close to 100K, just trying to decide what brand plug, stay with AC delco or go to NGK, Bosch or Denso

BaTu
03-24-11, 10:14 AM
You're thinking you can do better than the 100K you got from the Delco's ;)

dkozloski
03-24-11, 10:26 AM
Everybody that strays from the ACDelco OEM path for spark plugs soon finds themselves wandering in the wilderness chasing engine roughness and misfiring cylinders. Save yourself a lot of aingst and stick with the one that brought you to the dance.

Cadillac_STS
03-24-11, 12:11 PM
I agree, I would stick with the original that GM fix in the car in the first place. ACDelco

Loren
03-24-11, 12:31 PM
I recommend you stick with Delco but ask the dealer first how much he charges for them, you should also change the wires, filters etc. The dealer is going to rob you on the price of parts though. Go on the internet to Rock Auto, they have the best prices I've found. The dealer wanted $137.50 for the Delco wires, I got them at Rock for $43.95, also Delco genuine parts, plugs, filters everything I needed. The dealer is still going to charge you the same labor charge as a brain surgeon gets, but the only way to avoid it is to do it yourself. If you go the DIY route be really careful on those plugs, I've heard horror stories about them being stuck in the head after so long and guys stripping the threads out trying to remove them.

KRSTS
03-24-11, 12:58 PM
Go with the OEM Delco's

RippyPartsDept
03-24-11, 01:09 PM
these engines don't have wires... they're coil over plug

PM me your VIN and a list of parts if you're interested in discounted OEM parts

EChas3
03-24-11, 08:57 PM
I would only use OEM and I wouldn't be in a hurry. Unless you have reason to believe there's an issue or previous owners used poor fuel, why mess with what works?

If you do decide to change the plugs, the wires may be fine. I'd consider stopping with spark plugs. You can always change wires (etc.) later.

On the other hand, when one of our STS's gets close to 100k miles, I want to find a transmission shop that knows how to refresh the fluid while maintaining purity.

chazglenn3
03-25-11, 01:53 AM
Still no wires on the Northstar engine! :D

RippyPartsDept
03-25-11, 08:33 AM
the last year N* that used wires was 1999

chazglenn3
03-25-11, 08:03 PM
Yeah...I had one of those...a '99 STS...head bolts pulled. Does the pre DI V-6 engine have plug wires?

torogt
03-25-11, 09:23 PM
I,ll stick with the AC plugs, Buy mine from NAPA because I work there so I get them at a discount. Car still running good but would like to change them at the 100K mark

RippyPartsDept
03-26-11, 08:28 AM
Does the pre DI V-6 engine have plug wires?

nope... the LY7 and LLT both use coil over plug

MGD
03-26-11, 07:52 PM
Do you change the plugs only at 100K miles, or after a certain number of years? I have an '05 with 50K miles.

RippyPartsDept
03-26-11, 07:59 PM
only mileage

MGD
03-26-11, 08:41 PM
Great, thank you!

Frikiton
03-29-11, 12:32 AM
I bought mine w/ 117k miles and currently at 119570 dont even know when was the last time spark plugs or anything was changed.

What should I do?
wait till a problem happens ?

z06bigbird
03-29-11, 03:05 AM
I have heard that a variety of makes (cars) tend to have the plugs freeze inside the heads if you wait until 100,000 miles. Being the genius that I am, I change my plugs at 99,999. Where there is a will, there is a way. lol

RippyPartsDept
03-29-11, 09:07 AM
Frikiton... if the regular maintenance was done at or around 100k then you should be okay... (which is basically just spark plugs)

I would think that your engine would probably be running rough by now if you still had the original plugs in there

If you are curious you could have your mechanic take one out and see if it's even an acdelco plug - if it's not then I would definitely put the oem plugs in there but if it is you're probably all good
and maybe your mech can even tell the difference between a plug w/ 20k on it and one w/ over 100k on it

Frikiton
03-30-11, 03:11 AM
Frikiton... if the regular maintenance was done at or around 100k then you should be okay... (which is basically just spark plugs)

I would think that your engine would probably be running rough by now if you still had the original plugs in there

If you are curious you could have your mechanic take one out and see if it's even an acdelco plug - if it's not then I would definitely put the oem plugs in there but if it is you're probably all good
and maybe your mech can even tell the difference between a plug w/ 20k on it and one w/ over 100k on it

Thanks Rippy your the best!

RippyPartsDept
03-30-11, 09:51 AM
:dumbbells: