Just a reminder for first gen owners. SPARK PLUGS

Im sure there is always somebody changing plugs, if your sticker is missing; or maybe you just might not know.

Make sure you use double ground plugs. (3.4L)
ex: DENSO 3289

 

Is that the same for the 2.7l 4cyl variations?

 

If you really want to go down a rabbit hole, try to find the correct wire type (for dual electrode plugs) gapping tool with .044 on it.

 

actually toyota put out a revision a few years back.....
most of the newer design plugs are sufficient......including most all the newer iridium plugs...
If you go to Napa parts they'll show whats cross compatible....according to toyotas specs.....

I've been running the BOSCH ones for three years with stellar performance.

But yes if you have to have the denso's , then you have to run the twin electro one....

All the iridiums I've received came properly pre-gapped...

 

I'm running platinum single electrodes, it starts up better tbh. When I had dual oem ones, it took a little longer for the engine to fire up.

 

No. 4cyl takes Denso K16R–U11 or NGK BKR5EYA–11

 

You technically can use any plug that will screw in.
Gaps won't even matter.. Even with correct spacing, they wear down and the gap changes; yet still works but less efficient.

Those are the two keys to duals.

1. Heat mitigation, the spark doesn't have to dance from only 1 point, and differentirely directions each spark. As carbon builds around the electrode the path of least resistance is taken. On single plugs, it eats at the top, towards one side - or cleaner area because the carbon is built around edges.

2. Longevity, since the dual plug has 2 grounds, the sparkand heat are mitigated evenly, and the heat is shared between the two grounds. Keeping the electrode from eating at the top, and ends up holding gap for longer. Looks like a small flathead screw driver by the end, but the gap is typically kept.




I've read this, (from a yota tech) though I don't know how true it is?

"Twin ground electrode type spark plugs are used on the 5VZ–FE engine. Due to the employment of the DIS system,the number of spark produced is double that produced in the conventional ignition system. To maintain spark plug durability, the ground electrodes have been made bipolar.

In the DIS system of 5VZ–FE engine, each spark plug is connected to the end of the secondary winding. High voltage generated in the secondary winding is applied directly to 2 spark plugs. In one of the spark plugs, the
spark passes from the center electrode to the ground electrode and in the other plug the discharge is in the opposite

direction, i.e., from the ground electrode to the center electrode..."

It's personal preference in a way I guess, I also have a ford e250 van, I've since switched to Motorcraft dual ground plugs and would on my other vehicles if they made them. Guess that's the craze with the e3 plugs? Just don't like the company.