"Injector cleaning doesn't need to be done on a regular basis, but if you are experiencing stumbles, stall, hesitations, or other driveability problems with your vehicle, then it may be the gum on the injectors causing the fault. Injector cleaning doesn't need to be done on a regular basis, but if you are experiencing stumbles, stall, hesitations, or other driveability problems with your vehicle, then it may be the gum on the injectors causing the fault."

Quite randomly, my 2009 4Runner won't respond immediately when I press the gas pedal. I'm assuming this is the hesitation you described. I have no plans to replace my truck (which has over 130K well-loved miles on it), but hate the idea of rip-off service. The local dealership quoted $154.00. Should I shop it around?

Excuse me for bringing this one back from the dead.

Hey @BrianSD_42 , I seem to be experiencing the exact same issue - did you ever find out what the culprit was?

In my case the engine was compression tested and it failed a leak down test. I ended up getting a new engine.

That said lots of people here have random misfires that eventually get solved. Very few every involve getting a new engine .

Well that's scary... hopefully mine does not suffer the same fate. It's going in to a reputable shop next week so I'll post up any findings shortly thereafter. Thanks for responding dude.

I use Amsoil P.I. every oil change, maybe it's not necessary but I don't care. It works for me and I consider the $10-11 it costs as part of the oil change price.

Well, a compression test showed 160psi across all cylinders except for cyl #1 which was at 180. Not too bad for a truck with 320k km's (or 200k miles). Some new injectors and she's running smooth as glass.

Back when I had my 03 Tacoma had this done by my mech. charged me like a 150$ & I remember watching for like the 1st 10 min. all this black sh*t coming out the exhaust & how after another 10 it went white WOW ! Ran really well , probably had 75g when I did it & ran great for another 75g till traded for 05 4r.

Anyone considered the Motorwest Denso Upgrade kit?

Denso Fuel Injector Upgrade Set for 3.4L V6 4Runner Tacoma and Tundra – HP831 – MotorWest Performance

I just run some seafoam through the vacuum line just past the throttle body and it seams to do the trick!

They are all reconditioned. What's the upgrade?

edit: Just checked their site and they are using/reconditioning Denso Lexus es 300 and rx 300 injectors. Other injector companies have been reconditioning these as well.

Always love a product that has instructions stating once you're done to basically "get on the freeway and HIT THE GAS PEDAL" lol...it practically tells you to hit the freeway/interstate hard and then you're done :P

my neighbor wasn't a fan of the smoke cloud in my driveway when I was running the idle at like 3k or whatever it recommends though ha ha