Spark Plug Question

I just did a plug swap in my '08 DC TRD. Read the "how-to" article on this site, and no problemo. Only question is, the plugs I removed (usual 3 Denso, 3 NGK) were gapped at .055. Now, I know that the gap can increase over time/usage, but I didn't think it would increase that much... Seem odd to you???

I reinstalled my new Denso's (all 6) at the suggested .041 (they were actually gapped perfectly from Toyota). Truck runs great. Just curious if anyone else noticed their original plugs out around .055, and if so, why do they suggest .040 - .044 when they come .055?

Thanks again for the awesome write-up on the site. Made the swap much quicker!

 

at what mileage did you swap the plugs out?

 

ODO reads 60,000 km, so I was 10,000 over the suggested 50,000 time frame.

 

I think mine were original but I found out that they weren't the 100K plugs.
Should have been replaced much earlier.

They were worn to .074
Truck ran fine but new plugs did make a difference.

 

When I did my plugs @30k miles the NGKs had worn to a .052" - .055" gap while the Densos where .048" - .050".

 

I just changed the plugs on my truck, here are the numbers.

On my truck with 46150 Miles (74274Km), here were the gaps on my plugs. 1 is the plug closest to the radiator, 2 is middle, 3 is closest to the cabin.

Drivers 1 NGK - .053
Drivers 2 NGK - .054
Drivers 3 NGK - .053

Passenger 1 Denso - .047
Passenger 2 Denso - .049
Passenger 3 Denso - .049

 

denso iridiums@ 51,000