Gapping OEM Spark Plugs?

[YngTLCOwner]

May be dumb but do you have to Gap OEM Spark Plugs? I was told two different things.

1. With OEM you don't have to and 2. Yes you do no matter what

Which is the correct one? If YES, you do have to and you don't what are the issues you could run into? What should you do to correct it?

Thanks

 

[cruiserdan]

Toyota factory spark plugs, 90919-01176, are pre-gapped at .8mm (.031 in). It is not a bad habit to confirm the gap when installing the plugs. They are shipped with a protective sleeve around the bottom of the plug but that does not mean that they couldn't get knocked around. This information applies only to factory plugs in Toyota boxes.

 

[YngTLCOwner]

Thanks Dan!

 

[Scamper]

Being of an anal retentive nature, I always check the gap, even when the OEM plugs are provided by the venerable CDan. I have found many times that the gap was just wrong--usually by just a little, and probably not significant, but sometimes by a lot and definitely needing regapping. The plugs I last got from Dan were 5 for 6 on being gapped correctly, but there was one bad one in there. For the 5 seconds it takes to check the gap (vs the hassle of replacing the plugs), you'd be well served to check 'em.

Tom

 

[cruiserdan]

I guess you found the one we dropped

 

[Scamper]

Even the Great Ones must fall...

 

[robbie]

I would agree with Scamper on this. as good as the factory things happen. It is always better to check. I do all the time to make sure. I do find one in twenty or so that needed to be fixed. later robbie

 

[Doc]

Always gap. My truck's PO didn't subscribe to gapping. I had about twice the spec'd gap when I swapped plugs last weekend.

Ironically, it doesn't seem to run much better with properly gapped plugs. I haven't done a gas milage evaluation though...