Originally Posted by Jerry Bransford
187K miles isn't enough to automatically assume the injectors are bad. My previous TJ had more miles on it than that and its injectors were fine. When is the last time you changed your spark plugs and exactly what type and model spark plugs did you install?
I should add something.
The car that benefited from injectors is 26 years old.
It sat 10 years without running --- we named it the Rip Van Winkler.
It needed injectors. Badly. How did I know? I replaced everything else first.
They were likely badly varnished from sitting in old gas, no exageration, 10 years.
(Witch Hunter charges $17 to flow-check, clean, re-fit with orings, and re-flow-check them)
Instead, I found a deal for $20 for new design III units --- and went with it. Luckily it solved the problem (very vividly / no speculation)
Other cars, similar, 82, 83 84, 85, 86 --- are running original injectors ( similar to the Jeep 97/8 etc units)---- with ZERO issues.
Injectors, reinforcing Jerry's point, and JBTJ's point also, are over-engineered and unlikely to fail.
I think this is an interesting and helpful thread from an Australian Jeep forum.
Here's another thread that has interesting discussion and links about injectors.
Its car specific, so you have to look past that. These guys are replacing injectors not so much because they are bad, more because they are adding boost and need fuel, else have $ to spend to make the old cars perfect.