So I was wanting to post about my idle. It is not glass smooth, but not horrible. It's like you can feel an intermittent miss

It does NOT throw misfire codes.

Power is great and does not miss a beat at all while accelerating.

I recently changed the following:

1. Plugs (Bosch 4)
2. Plug wires (Magnecore)
3. Purge valve (Hyundai)
4. Front O2 sensors (Bosch OEM)

I don't get check engine light, but the Ultra gage shows pending P0441 from time to time.

Ideas??

 

I have the same code and same idle

Read my Tricky Dick - P0441 thread for updates on how I am trying to resolve it

 

Friday Night... I read your post a few times and there is nothing in your post that I haven't already tried.


How is the best way to pressure test the system to see if there are any leaks or issues.

 

I am starting to think that the P0441 and semi rough idle are NOT related.


The P0441 is a Evap Control System Incorrect Purge flow. Since I have already changed the purge valve I don't think that is it.


I checked the emission hoses and don't see a problem there. I checked the seal of the gas cap by applying some Vaseline on the seal, then screwing it in to check contact. It looks like part of the gas cap is not sealing completely.


I changed the gas cap. We will see if that helps.


BTW, has anyone ever done the seafoam purge and it actually helped idle?