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Old Sep 24, 2023 | 07:30 PM
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I was told by a shop that:

E3 spark plugs are so bad that they refuse to install them. The shop returned the E3 spark plugs and wires that I provided and installed MSD wires and NGK plugs instead. Now I have to package up the E3s and return them.

Are they that bad?

The car drove fine to the shop. I arrived Sunday evening when they were closed and left my keys in their lockbox.

The next day while I was out of town I got a text saying that the car wouldn't start and that I needed a new battery. Okay. So I requested a quote on an AGM battery.

They said that there are no AGM batteries for Corvettes and gave me a lead acid Die Hard instead. Is this true?
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Old Sep 24, 2023 | 07:39 PM
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Originally Posted by C6pusher
I was told by a shop that:

E3 spark plugs are so bad that they refuse to install them. The shop returned the E3 spark plugs and wires that I provided and installed MSD wires and NGK plugs instead. Now I have to package up the E3s and return them.

Are they that bad?

The car drove fine to the shop. I arrived Sunday evening when they were closed and left my keys in their lockbox.

The next day while I was out of town I got a text saying that the car wouldn't start and that I needed a new battery. Okay. So I requested a quote on an AGM battery.

They said that there are no AGM batteries for Corvettes and gave me a lead acid Die Hard instead. Is this true?

maybe
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Old Sep 24, 2023 | 07:45 PM
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could be
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Old Sep 24, 2023 | 08:23 PM
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These are the struggles you face when you need to rely on a shop for basic maintenance.

To their point, e3 plugs have plagued many of people over the years. They certainly do not belong in a sports car.
MSD ignition components are another one. The wires are not bad, or dist caps, but past that, don’t waste your money.
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Old Sep 24, 2023 | 08:35 PM
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Thanks.
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Old Sep 24, 2023 | 08:54 PM
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Why were you taking to the shop to begin with? I'm assuming to install new plugs and wires.

What was wrong with the current plugs and wires?

How old is the current battery? Do you leave it on a tender?

What year is your car?
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Old Sep 24, 2023 | 09:18 PM
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NGK spark plugs is what the engine takes, E3 design could cause issues. Shops don't always like installing customer supplied parts but they did good by putting the correct parts.
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Old Sep 24, 2023 | 09:51 PM
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E3 plugs are slightly longer than let's say the NGK plugs for the LS engine. Having a S/C'd LS7, I would never use E3 plugs....lots of problems from those who have tried them. Stick with the tried and true.
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Old Sep 25, 2023 | 07:19 AM
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stock delcos or NGK tr55s for n/a... anything else is a gimmick. Boosted cars require a little more playing with in the spark plug area but it all depends on your setup.
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Old Sep 25, 2023 | 07:50 AM
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Yes, E3's are bad. Cause way more problems than they are worth.

NGK or OEM AC Delco is what you should use. (NGK is actually an OEM supplier to GM).
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Old Sep 25, 2023 | 09:50 AM
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Originally Posted by C6pusher

The next day while I was out of town I got a text saying that the car wouldn't start and that I needed a new battery. Okay. So I requested a quote on an AGM battery.

They said that there are no AGM batteries for Corvettes and gave me a lead acid Die Hard instead. Is this true?
This is absolutely not true. The Optima Red Top and multiple other companies have AGM batteries. Get them to remove that lead acid battery.
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Old Sep 25, 2023 | 12:39 PM
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AGM batteries aren't some night and day difference fwiw. The main advantage of AGM is that they can resist sloshing better, and supposedly they don't outgas. If your battery is under the hood, I wouldn't waste the money on an AGM.
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Old Sep 25, 2023 | 12:42 PM
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agreed, I've had terrible luck with AGM's in the past... def not worth the money.
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Old Sep 25, 2023 | 02:54 PM
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E3's a trash just like split fire and all the other "revolutionary" spark plugs.

AGM's last longer, I have them in everything I own including my GS C6. But Optima quality ain't what it used to be.
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Old Sep 25, 2023 | 02:57 PM
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Originally Posted by dr_gallup
E3's a trash just like split fire and all the other "revolutionary" spark plugs.

AGM's last longer, I have them in everything I own including my GS C6. But Optima quality ain't what it used to be.
god I remember split fires! I fell for that one back in high school!
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Old Sep 25, 2023 | 04:33 PM
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Originally Posted by vetteish
god I remember split fires! I fell for that one back in high school!
Yep, good ole Split Fire plugs and SLICK 50!
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Old Sep 25, 2023 | 04:50 PM
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and STP !
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Old Sep 25, 2023 | 06:45 PM
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The Tornado fuel saver?


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Old Sep 25, 2023 | 07:08 PM
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Originally Posted by Corvette_Ed
This is absolutely not true. The Optima Red Top and multiple other companies have AGM batteries. Get them to remove that lead acid battery.
Just an FYI concerning AGM and FLA batteries…if your Corvette came out of the factory with a FLA that is the battery you are supposed to use and not an AGM…the cars charging rate is based on that battery whether a factory AGM or FLA…Paul Koerner is a top notch Corvette Tech.

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Old Sep 30, 2023 | 07:08 PM
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Originally Posted by Colonel
Yep, good ole Split Fire plugs and SLICK 50!
Slick 50 works great! Until it breaks down and then clogs the pump.....
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