AC delco 21025102
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Joined: Feb 2025
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AC delco 21025102
I ordered spark plugs a few days ago from Autozone and their website list 21025103 as the correct plug. Looking at the RockAuto website the only difference I can discern is a slight difference in length. What I cannot find is a heat range on either of these plugs. Would there be a big difference since they are only one number off each other? 94 sl2.
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Joined: Jul 2005
Posts: 12,315
From: Slightly off center
Just return them.
I'm confused how you ordered the 02 as the AutoZone web page for a 94 SL2 lists the correct ACDelco part number
AC delco 21025103,
which matches RockAuto.
And the 02 plug is not for the SL1. No idea what it's for.
Check your invoice.
These cars are very finicky with respect to the ignition system. At least they can be. The NGK 5643 is the identical plug which used to be cheaper but isn't anymore. How about that.
I'm confused how you ordered the 02 as the AutoZone web page for a 94 SL2 lists the correct ACDelco part number
AC delco 21025103,
which matches RockAuto.
And the 02 plug is not for the SL1. No idea what it's for.
Check your invoice.
These cars are very finicky with respect to the ignition system. At least they can be. The NGK 5643 is the identical plug which used to be cheaper but isn't anymore. How about that.
Super Moderator
Joined: Jul 2005
Posts: 12,315
From: Slightly off center
The 03 is the correct part number so there is no issue.
To convince yourself, go back to the AutoZone site and the RockAuto site and check. They are both the 03.
You are good to go, unless they sent you the wrong plugs.
To convince yourself, go back to the AutoZone site and the RockAuto site and check. They are both the 03.
You are good to go, unless they sent you the wrong plugs.
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