i got my truck back in june and i changed my plugs for the first time today....in there already were autolite 3924s and i switched to the 23s...and oh my gosh what a difference...there was a dramatic improvement across the board...my old ones didnt even look too bad....all of my other vehicles i have used top of the line bosch plugs and i have never had one respond as well as my 5.2..............

 

Glad you didn't put Bosch plugs into your 5.2. They don't work well for our engines, burn to hot or some such.

 

i like my 3923's.

 

Autolites ran like crap in my truck. Mine runs best on the stock plugs.

 

i have autolites in mine and they work good

 

The autolites I tried worked well for about 1000 miles. Then I started having bogging problems, especially with heavier throttle. Switching to NGK V-power plugs have worked much better for me.

I am running an MSD 6A box, so the plugs are getting popped 3X more than the stock setup.

 

Heres a good one. Went to get new plugs for my mom's 07 Toyota 4Runner V6, (you have to replace them every 30,000 in a 4R!) and the ones they had were platinum 3923s. going to install them monday and see if they work any good in it. I have yet to put them in Purpl, but i need to cause of the crappy bosch plugs that are in it now.

 

i didnt know that they had platinum....i was reading somewhere the other day that platinum lasts much longer but you lose performance and mpg

 

when comparing spark plugs,
keep in mind that:

1. just unscrewing and screwing back in plugs knocks loose carbon deposits that have built up around the end of the plug threads

2. best way to compare one set of spark plugs to another is new versus new.
at the least the old plugs should be cleaned, sharpened and re-gapped first, then compared to the new plug after

3. with 8 different cylinders it may be that more than one plug design is optimum. Cylinders 7 & 8 on Magnum V8s seem to run hotter and get a leaner air to fuel ratio. Most cylinder head gasket failures and cracked combustion chambers seem to be 7 & 8

 

What plugs would be Ideal for my truck then? I have an 01 5.2, and honest to god, I have never changed the plugs in 96k miles, yet they still look really really good. Very clean in the gap, and not much burn on them.