This is a HUGE issue with 4Runners.
The diaphram in there will flex loose when the screw falls out, then breaks, and drips gas on the exhaust pipe or header.
Causes LOTS of engine fires in the SR5s
Seal that sucker in there, expensive to replace, dangerous to leave unrepaired.
It seems to blow the injector seals when it goes bad too. Mine are all leaking.
Who r u folks having do your injector conditioning ?