2TR-FE Sparkplug Questions

I'm about to change my spark plugs in my 2.7 L and have two questions before I begin. I've never changed plugs before in my life so if these questions sound dumb I'm sorry lol.

1: Is a torque wrench necessary for tightening down the plugs? Or is "snug" enough? What do you do?


2: In terms of gapping I have been told that you should simply verify the gapping is correct when you buy OEM plugs and that you should return them if the gap is off...is this true or can I adjust them myself? I heard you shouldn't gap iridium plugs because iridium is so brittle and that's why you should return them.

Thanks in advance guys.

 

The correct answer for #1 is yes, you should use a torque wrench. Though many people get away with just snugging them up with a ratchet. Up to you, but you can rent/borrow them from AutoZone

Spark plugs come pre gapped nowadays so there really isn't a reason to gap them yourself.

 

If you don't have a torque wrench, sometimes on the spark plug box there will be instructions to tell you how much to turn it once the crush washer makes contact with the head. Most of the time you don't have to gap the plugs, but it couldn't hurt to carefully check it to make sure the gap is correct if you are concerned.

 

And the correct torque spec is 15 ft/lbs

 

Finger tight plus a quarter turn has always been my method for plugs if a torque wrench is unavailable.

I'd definitely check the gap, just do it at the counter till you find four and then buy them.

Finally, I always try to index the plugs, which is aiming the electrode opening towards the intake side of the cylinder. Not sure how much this helps on newer engines but it's a habit from working on old stuff.

 

Never trust the pre gap on the plug. It only takes one careless drop of the box to throw it off. Even with the plastic sleeves that are on some during shipping, I've seen them be off. Always check the gap before installing, it's good insurance.

Also, remember, you're screwing a plated steel spark plug into an aluminum head, use never seize!