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Old 08-14-2012, 05:30 PM   #1 (permalink)
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Spark plug change interval

How often do you guys change your spark plugs? Do you base it on a random number, something you read or when you notice a decrease in performance?

I never had a problem with my car but slowly over time I have noticed it doesn't have the power it used to so I finally changed them at 116k kilometers. I wasn't able to get AC Delco so I got NGK platinum instead... Thoughts?

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Old 08-14-2012, 05:44 PM   #2 (permalink)
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Just changed the original AC Delcos and wires in the wife's '04 Malibu LS 3500 at 111,000 miles. Plugs looked like new but the wires were toast. It wasn't running "bad" but it runs a LOT better now. It was still getting 33 MPG on the old set. Wish my Impala got that kind of mileage.

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Old 08-14-2012, 06:21 PM   #3 (permalink)
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I was getting 32MPG already. I haven't been able to test the new plugs though as my wires were shot and I broke 2 of them. I won't be able to check a difference until tomorrow. My old plugs were rusty but the lead colour looked great overall.

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Old 08-15-2012, 06:19 AM   #4 (permalink)
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Should be around 100k at minimum. I use autolites and some people start to have some problems after 2 years, so I usually just do mine ever other summer..thyre cheap enough


Also those NGKs are fine plugs
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Old 08-15-2012, 09:19 AM   #5 (permalink)
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double platinum or iridium OEM quality plugs can do 100K miles.
Basic copper plugs much less and depending on how much you drive annually might be a good idea.
Single platinum fall somewhere in between.

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Old 08-15-2012, 11:32 AM   #6 (permalink)
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50-60K for me.

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Old 08-15-2012, 06:53 PM   #7 (permalink)
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So I got new NGK plug wires and boy do those new plugs and wires put some pep back in the car. I knew I should have changed them a while back.

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Old 08-15-2012, 09:00 PM   #8 (permalink)
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I read some where here ngk was ac delco?

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Old 08-16-2012, 03:33 AM   #9 (permalink)
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An older mechanic at work told me the same thing. No idea though.

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Old 08-16-2012, 07:44 AM   #10 (permalink)
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Quote:
Originally Posted by MixedImpala04 View Post
I read some where here ngk was ac delco?
NGK made AC Delco's spark plugs for them. So they are basically the exact same thing.

Which is one reason why NGK is one of the few good SP brands for our cars
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Old 08-16-2012, 10:04 AM   #11 (permalink)
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I've used NGK & Delco on my LS truck for years without issue. Not time for a change on the Impala yet.

Based on the effort it took for my (new then) Olds Ciera GT with a 3.8l V6, I'm not looking forward to it

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Old 08-16-2012, 11:23 AM   #12 (permalink)
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Not that hard at all, ten times worse to change them in that truck of yours.

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Old 08-16-2012, 11:38 AM   #13 (permalink)
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Quote:
Originally Posted by kingnutin View Post
Not that hard at all, ten times worse to change them in that truck of yours.
the 5.3 is a breeze. Need a combo extension/swivel to get to the right rear plug is all :)

I remember loosening/removing the dogbone and having dad pry the motor forward as I changed the back three plugs on the Ciera GT. Going in blind and with fingertips

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Old 08-16-2012, 01:15 PM   #14 (permalink)
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Maybe it fits in there different than the LS motors I've worked on, I always had to go through the fenderwell to get that one. The impala is going to be the same deal, remove dogbones, rock forward, go in blind. Not too hard though.

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Old 08-16-2012, 01:47 PM   #15 (permalink)
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Was more trouble getting the plug wires off then it was removing the plugs. As king said, bones off, strap it forward and presto.

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