Cylinder 5 misfire possible evap issues

I was driving to work this morning and out of nowhere the truck started to shake and run like hell. I pulled into auto zone and they scanned it. Pulled the p0305, p0446,p0441 codes and sold me some new platinum plugs to install (definitely needed them). After putting the new plugs in still misfiring (I don’t own my own OBD II yet).

Looking at the engine bay evap canister and hoses everything looks fine except the small one that loops. Could that lead to the misfire? I’m wondering if it’s a fuel rail or injector thing because the misfire is only one cylinder?

 

Have you moved the offending ignition coil to another plug to see if the misfire follows the coil? That will give you your answer or help narrow it down.

 

I was going to do that but I dont have an OBD II sensor to check if it moved. Might have to make the purchase.

Edit: the P0441 and P0446 have been triggering the check engine light for months at this point. the misfire is as of today so that's what is leading me to other issues. Im ordering a scanner now.

 

If you're going to own an older vehicle, it's a necessity. BTW, it really helps if you let us know what you're working on. You can put it in your profile. Year, cab type, engine, drivetrain, etc. Helps us help you.

 

Just updated. it is 2002 Tundra 4.7L V8. I think it is the limited.

 

Nice job. Thanks.

 

P0441,P0446 are like related to your split evap hose.

P0305 is probably not related, but most likely a bad coil assuming the rough running was immediate and permanent… not an occasional misfire under load. Like mentioned above, swap coils to confirm.

also no service history mentioned, but if these parts are original, I would budget to replace them all.

 

Agree with this. Cylinder 5 is on the driver side, the 3rd cylinder from the front of the truck. I recommend swapping the #5 coil pack with the #7 coil pack (cylinder closest to firewall on driver side), and see if the code changes to P0307. The last digit of the code is the impacted cylinder for P0301-P0308 for the V8. But you need to fix that hose also. And Toyota doesn't make it anymore, but someone on here recently showed a pretty cool substitute. I think it was @bfunke

 

@Shifty It is an Honor for you to bequeath my thread with your knowledge. I will report back once I check and/or replace the coils.

 

Swap coils with another cylinder before you replace. Misfires can be caused by a wild array of things, and genuine Denso coils are $$. You don't want to use anything except Denso from a legit seller.

 

The U-shape hose is not available unless you spend big bucks on the cannister assembly. Here’s what I used.

$15 XYgdhqpt 5/16" Mandrel-Formed Molded Rubber Fuel Line Hose Elbow 45° 90° 135° 180°degree bend-5/16 molded hose(45 90 180 135 degree bend turn angle)

https://www.amazon.com/dp/B0CHP79NTT?ref=ppx_yo2ov_dt_b_fed_asin_title

 

In summary it was the Ignition Coil. I moved Coil #5 to Cylinder #7 and the Misfire code moved with the Coil. Bought some new Coils (Not OEM they are $600!!) but I got the life time warranty Import coils from Oriley's. Sorry to the purists here. I also took Shifty's idea of checking the timing belts to be sure I don't have any cracked belts. They look good at 160,000 miles so far.

Thank you for everyone's suggestion.

 

Take the O'Reilly junk back and buy a Denso coil. No need to replace all of them. I would keep one spare on hand for the future
DENSO 6731303 $54.79