plug wiring diagram

[farrowboy86]

i changed my plugs and wires on my sr5 and made the mistake of not changing my wires one at a time and i think i got em mixed up as far as numbers go i dont know which cylinder is which but the closest one to the grill of the truck on drivers side should go to the one closest closest to the grill on passengers side right someone please help me in non mechanic terms when i took them off they were attached to the ones directly across from one another but when i hooked new wires up it backfires like crazy

 

[jacob7071]

I hope they were not paired to the cylinder directly across. If you're standing at the grill looking toward the windshield, the cylinders are numbered as follows

5 - 6
3 - 4
1 - 2

The wires should be paired as follows, 1-4, 3-6, 5-2. The longest wire should be the one going between 3-6. The second longest should be between 2-5. And the shortest should be between 1-4.

 

[TheDurk]

I forget who I stole this from, or I'd give credit...

Is this non-mechanic enough? If the truck was running, there is NO WAY they were wired to the cylinders straight across.

 

[TomBrown11]

I’ve got a p0306 code on my ‘02 4Runner 3.4L v6, so my plan is to check the plugs n coils first. Context: 250k miles, got a p0304 code 3 years ago, but I’m not sure what the shop did to solve. Plug, coil, both(?), on cyl 4 only, or all?
My questions, if anyone can help, are:
1) is this the best route to begin diagnosing a p0306? I plan to switch the coil on cyl 6 with cyl 4 first, to see if the code changes from p0306 to p0304. Then, if the code doesn’t change, I plan to swap out the spark plug with a new one.
2) what tools would I need to accomplish this? I saw a video of what to remove on the starboard side (ie. for cylinders 1, 3, and 5), but I’m realizing now I need to remove anything above the port side (for cylinders 2, 4, and 6). I seems that ill need a spark plug socket and an extension long enough to reach the plug, but other than that, does anyone else know what I need to pick up from while I’m there?

Thanks in advance!

 

[Sparky 97Runner]

1) is this the best route to begin diagnosing a p0306?

The FSM lists the ignition system as a possible trouble area for P0306 so yes, this is a good starting point for diagnosing. You should be able to remove the air intake tube and swap the coils with nothing more than a 10mm socket. The factory coils should say Toyota right on the face. It's doubtful the shop replaced with Toyota coil 3 years ago but hopefully they at least used Denso. Also, you shouldn't need to remove anything from the port side to reach the plugs. You will need a spark plug socket, three long extensions (6") and a swivel. And a 3/8 ratchet of course.

 

[phattyduck]

I’ve got a p0306 code on my ‘02 4Runner 3.4L v6, so my plan is to check the plugs n coils first. Context: 250k miles, got a p0304 code 3 years ago, but I’m not sure what the shop did to solve. Plug, coil, both(?), on cyl 4 only, or all?
My questions, if anyone can help, are:
1) is this the best route to begin diagnosing a p0306? I plan to switch the coil on cyl 6 with cyl 4 first, to see if the code changes from p0306 to p0304. Then, if the code doesn’t change, I plan to swap out the spark plug with a new one.
2) what tools would I need to accomplish this? I saw a video of what to remove on the starboard side (ie. for cylinders 1, 3, and 5), but I’m realizing now I need to remove anything above the port side (for cylinders 2, 4, and 6). I seems that ill need a spark plug socket and an extension long enough to reach the plug, but other than that, does anyone else know what I need to pick up from while I’m there?

Thanks in advance!

Follow the diagram above to know which coils feed cylinders 4 and 6. Swap those, along with all new NGK or Denso plugs from a reputable source (NOT eBay or Amazon).

The plugs are just a good idea in general (if its been over 60k miles, especially) and swapping coils will let know know if it is a coil or something else.

-Charlie