[MikeT]

Ok I have a question regarding the acutal plug gap for the tundra V8.

I bought replacement plugs from the dealer (Denso K20R-U) and I asked if they were pre gapped. He said yes. I went home to install them and of course the first one out of the box was cracked, it was too late to go back and exchange them so I decided to wait till the next day. While I had the plug there in my hand, I decided to verify it's gap. The plug right out of the box measures .027 The Tundra owners manual calls for a .031 gap.

So, the next day I went back to the dealer, since I had to return the cracked one anyway, I decided to double check on this "pre-gapped" plug. Again, I asked if these plugs were pre gapped and what the gap is supposed to be. The guy said yes they are ready to be installed as they are pre gapped (he didn't have the gap specs there and he told me if I wanted that information to talk to someone in service). I then asked if there were any other Toyota models that called for this same plug and he said yes! So I looked into it and about 5 or so other Toyota vehicles use this plug and the gap ranges go from .031 - .044 So what gives?

I asked in the service department to see what they had to say and one of the service writers flagged down a tech and asked him. He told me that all Toyota plugs are pre-gapped and ready to be installed. He even told me that that's how they do it, the techs just install them right out of the box!

So what gives here? Should I just install them out of the box? The manual and various websites state the gap to be .031 not .027 there is a clear difference in these gaps here.

I know too much gap is just as bad as too little gap.

Thanks,
-Mike

Moderators Note: The thread "Spark Plug Gap Discrepancy" has been moved to the Engine and Drivetrain Forum for better exposure and replies. PM was sent to thread starter of its relocation. --- Possum