Scotty, I have a 2000 Toyota 4Runner with the 3.4L 5VZ-FE V6 with 185,000 miles that is throwing the standard code for misfire on cylinder #3. I am using the twin electrode plugs which are specified on the engine labeling. For this motor. And since it was due for plugs I went ahead and replaced them as well as all brand new Toyota wires nothing generic everything's Toyota. As well as I've replaced all three coils after doing diagnostics swapping coils around didn't make a difference. They were original coils so I figured it can't hurt to replace them. So that only leaves my fuel injectors. So my question is do I need to do the standard removal like some suggest to pull all six injectors off and send them off to get them clean and flow tested and then put them back in, or can I have these things pressure cleaned as I've seen you mentioned on other videos before about fuel injectors. Should the on vehicle cleaning be successful in getting whatever garbage is plugged up inside the injector to cause my cylinder misfire on number three. Thank you for your help I appreciate it.
You do not need to remove the injectors to clean them. Find a mechanic who has the machine and can clean the injectors in situ.
The premise of "that only leaves my fuel injectors" isn't correct.
You may want to use your scanner to look at the Freeze Frame data which may give you a hint as to what's happening here.
For example, if you have an intake manifold gasket leak on cylinder 3 you'll likely see that code is getting thrown before the engine reaches operating temp or during idle.
Then maybe switch to Live Data and see if there's an elevated positive fuel trim on Bank 1 during engine warm up and idle rpms, but which diminishes as the engine reaches operating temp or when engine speed increases to around 2,000 rpms.
That would be a clue of an intake manifold gasket leak.
(It will also give you a clue if this is the #3 fuel injector acting up. If it's leaking a little you'll see the computer trying to compensate by the Negative fuel trims on Bank 1. Or if it's clogged a little, the Bank 1 Positive fuel trims won't be affected by engine RPMs.
Your 4Runner is 21 years old. Maybe check the compression on cylinder 3 and compare it to the compression of a couple of the other cylinders.
