Join Date: May 2017
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Hey guys, just was reaching out to get some advice on the best route to go about these codes. Right now my Jeep SRT 2016 is tuned with Daiblotoona (Johan), afe intake, catch can, SW headers 1.825” catless and Borla ATAK with a custom QTP muffle bypass.
I haven’t had any issues until the recent job adding the SW headers without the cats and the QTP bypass.
After a few days without having any check engine lights I received a P0304 on cylinder 4. Cleared it out thinking it was nothing, then the next day it came back as a P0300 twice in one day. I’m starting to think I should just add the cats in but hoping I didn’t damage anything.
By not having any cats could this just be a faulty reading?
To add this only happens when I start the car randomly. And I don’t hear or sense anything out of the ordinary. Light doesn’t come on when driving or WOT. First discovered with auto start P0304.
Edit: I just drove to work which is 60 miles and didn’t get a CEL yet.
MF CNT4 = 85
MF CNT6 = 51
MSFR CNT = 146
Last edited by Fossilk1; 04-09-2019 at 11:40 AM.