boraxman

Im confused. Trucks been tuned, wires, correct plugs, fuel filter, air cleaner, Maf cleaned, PVC..etc.

About a couple months ago it developed this miss thing, sometimes barley, sometimes bad, sometimes not at all. Alot of the time it just feels like its on the virg of running crappy...almost like its not gettig enough fuel.

Heres the kicker, when its bad, I can shut it down 1 or 2 times, restart and it it will be OK again.

It did turn on the check engine light once but I have no means to read codes.

Does anyone know WTF is goin on cause I dont

ElwayLite

Not sure on the cause, but when I got a CE light on my 2001 3.4 i just bought the $35 code reader from harbor freight and it lead me to a misfire due to the fact the factory plugs had 54K miles on them because the original owner didn't change them at 30K. BTW, autozone will pull your code for free.

boraxman

Pulled the code, #3 cylinder misfire. Im wondering if its the fuel injector

midiwall

Could be, but a misfire is more about the plug not firing than no fuel in the cylinder. You might want to check the coilpack, and the long stem heading to the plug. Pull the plug again, and check for discoloration, check the gap, look for cracks in the plug housing, make sure it was tight in the cylinder.

It also wouldn't hurt to run a can of SeaFoam through the engine - that would help flush out injector issues without having to pull the injector.

ElwayLite

Yeah, thats what I got but mine was fixed by the plug and wires. Since you've already done that I guess thats an option or the coil pack going bad. I don't know if the coil pack would malfunction or just fail.

boraxman

OK so which cylinder is #3?

garrett1478

i believe its the middle cylinder on the passenger side

wait for someone to make sure though.

midiwall

Yeup, Garrett's right - middle on the passenger side:
http://www.autozone.com/servlet/UiBr...3d8016043c.jsp
(page down)

MTL_4runner

You might want to pull the #3 plug and recheck it because sometimes they can be damaged during install or perhaps before. If the plug is still fine, then I would test the coil and replace if needed.

https://www.yotatech.com/forums/show...ht=obd+misfire

boraxman

Problem solved/ pulled #3 plug and the porcelin(by where it sparks) had 2 hairline cracks oppsite of eachother going all the up. These are NGK (not cheap) dual electrode plugs BTW.

New plug, back to normal

MTL_4runner

That type of stuff is more common than you think.
Glad you got that solved!