Alternator Core Charge? Spark Plugs

Quick question,
I noticed a core charge +73 when looking on Rock Auto. If I send them my old alternator does this still apply? Or do I even have the option to send my old one?


Spark plugs,
There is a few options. I was going to choose Denso but heard NGK is great as well. But the types in between had me slightly confused which to pick.

Copper
Platinum
Iridium
Double Platinum

Any and all feedback is greatly appreciated.

 

Rock Auto charges the core when you purchase the alternator and then you have 30 days to request a return label/postage which Rock Auto splits with you as I recall. The core must be a OEM factory (Denso) alternator so if a previous owner already replaced with a off brand alternator you might be out that core charge. As far as spark plugs, go with the iridium which is factory OEM to my understanding.

 

I believe the OEM plug is: Denso 3122

$4 K20R-U Denso 3122 Spark Plug

K20R-U

Not sure where I read that, but that's what I found in my truck when I swapped them out. Either way, plugs are plugs, NGK/DENSO hard to go wrong.

 

Truck runs soooooo smooooooth on coppers, which the manual calls for for my year model. They wear out in 20-25k miles though. I run the iridiums, which are good for 75-100k miles, and honestly still look good at that mileage. I change them with every timing belt change, which makes my service intervals easy. Timing belt, radiator and coolant, ball joints, MAF / throttle body cleaning, plugs and all diff / transfer case / trans fluids every 90k. I do a MAF / throttle body and trans flush in between.

 

I had to check OPs other posts to make sure he in fact has a 2UZ since he did not provide that info here or in his truck profile.

 

2000-2004 plugs were copper out of the factory while 2005-2006 were equipped with Iridium. Toyota typically lists a Denso and an NGK spark plug # in the owners manual. If you don't have a copy, you can download a the 2005 manual from the sticky thread here:

https://www.tundras.com/threads/1st...and-maintenance-schedules.91566/#post-2753128

 

If you go to Google and type Owners Manual Tundra #### where the #### is your year, you can download a copy of the owner's manual for your Tundra, latest copy, direct from Toyota. Here's the 2005: https://www.toyota.com/owners/warranty-owners-manuals/vehicle/tundra/2005/

In the 'Specifications' section - and believe me, I know, nobody bothers to read the fucking manual for much of anything, especially us men, we should do better! - but they tell you everything you need to know about replacement parts. As mentioned above, 2005+ calls for Iridium, but I'd be using Iridium plugs in the '00-04 too, they last twice as many miles.

NOTE: There is a typo in the manual for the DENSO plug on the 2UZ, it says KS20, it should be SK20! But I prefer NGK products.

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sorry I’m new to these trucks. Mine I believe is a 2UZ. It’s an 05 DC 4.7L. The spark plug options also have different gap sizing and I want to make sure I get the right ones while I place my order.

 

Thank you shifty! Looks as if the ones I chose from Rock Auto are the right ones. The gap is off by .01 if I’m reading this correctly. I did check my owners manual and it displayed what you showed above. Glad I double confirmed here. Thank you everyone.

 

Off by .001, or a thousandth. I probably wouldn't worry about a thousandth, but if you are persnickety (and nothing wrong with that), I suppose you could tweak it. I personally would verify the gap, then leave it be.

ETA - The metric specification is only to the nearest 1/10mm which is roughly 4 thou.

 

correct .001 or thousandth. I won’t loose my bearings over that. Although my OCD want to loose itself hahaha

 

You never gap iridium plugs. They come pre-gapped and shouldn't be adjusted. Risk of damage isn't worth any semblance of change you'll see.

 

And the owner's manual specifically warns against adjusting gaps on iridium spark plugs