I Replaced some OEM plugs on Tundra 5.7L with 90K miles. Vehicle was running good, just routine maintenance. Plugs shown as removed from engine with the front of the engine being at the bottom of the page. I was shocked to see cylinder #4. Half the insulator was gone. There was not miss or hesitation in the engine with these plugs. Even did a cylinder deactivation test with these plugs and the engine run rough when any cylinder was deactivated. From the condition of that plug it look like it may have been like this right from the factory. Surprised vehicle ran fine and smooth like this. Just thought I would share.
Spark Plugs Tundra 5.7L 90K Miles
- Thread starter Drew7a
- Start date
Wow. Those look similar to mine, did them at 75k.
I’ve got a Lexus RX350 with 165k I need to do. I pulled #4 last weekend and it looked great.
I’ve got a Lexus RX350 with 165k I need to do. I pulled #4 last weekend and it looked great.
Big time.
If you look closely the #4 insulator is totally cracked and gone. I think it was a bad plug installed at the factory.
Wow did you buy it new?
Yes, vehicle was purchased new.
So you know for sure it's never been hot and those have never been changed. That's interesting... I've never seen that before.
Might be worth pulling that plug again. Take a bore scope down that cylinder and see if there is something. Chances are the piece blew out the exhaust or it was missing to begin with.
Correct never been hot and even with that plug in its condition it ran smooth. I will pull the plug at every OCI just to keep an eye in it.
As ARB1977 suggested, I will throw a borescope in and compare with another cylinder.
