2012 R56S Misfiring And Stuttering P0301
#1
2012 R56S Misfiring And Stuttering P0301
Hey all, I've owned this car for a couple months and it's been a blast. I've been driving it pretty hard in the hill country here, hitting the "Sport" button is a habit when I start the car every day. Last week, under hard acceleration, it backfired between gears. At the next light, the engine was running very rough. The idle had a hiccup and now it sounds to be running on 3 cylinders most of the time. The car has 65K on it now, there is heavy stuttering and random backfires at idle, and it does not sound healthy if I apply the throttle. I added a bottle of Techron fuel additive to see if I could remedy bad gas or maybe a dirty injector, but it has seemed to only get worse. Once the engine has warmed up, the stuttering is minimal, but it still happens. I've avoided driving it until I can track down the issue, hopefully someone here can give me some insight. I've ordered a new set of NGK iridium plugs, should be delivered today. Any clue?
EDIT: Here's a video. I had let it warm up a little and went back out an hour later to shoot this clip. I've been running straight pipe from the secondary cat back, would this have caused major issues?
EDIT 2: Replaced the spark plugs with the NGK iridiums. The car is plenty warm since I ran a mile down the road to Autozone for a part. It idles just fine, but still feeling a little choppy while in low RPM. Would that be caused by the ECU trying to manage the misfiring? I threw the code P0301
EDIT: Here's a video. I had let it warm up a little and went back out an hour later to shoot this clip. I've been running straight pipe from the secondary cat back, would this have caused major issues?
EDIT 2: Replaced the spark plugs with the NGK iridiums. The car is plenty warm since I ran a mile down the road to Autozone for a part. It idles just fine, but still feeling a little choppy while in low RPM. Would that be caused by the ECU trying to manage the misfiring? I threw the code P0301
Last edited by iambazzy; 01-09-2017 at 01:01 PM.
#2
I believe this is the wrong section for this, but not sure as I'm a new member as well. I'm actually chasing a similar problem, but with cylinders 1 and 3. Based on some brief research, I believe the coils are the culprit. Planning to replace the coils and spark plugs, will advise once completed.
Regards,
EMNI
Regards,
EMNI
#4
I always hate finding a thread that doesn't have an answer, so here's my fix!
P0301 was a misfire on cylinder 1, I went ahead and replaced all the spark plugs at 65K miles and it helped but was still stumbling/backfiring at 1/3 throttle. A new ignition coil on cylinder 1 was all it took to get the car running great again. I noticed the one I pulled was a Delphi unit, not sure who manufactures the OEM coils.
P0301 was a misfire on cylinder 1, I went ahead and replaced all the spark plugs at 65K miles and it helped but was still stumbling/backfiring at 1/3 throttle. A new ignition coil on cylinder 1 was all it took to get the car running great again. I noticed the one I pulled was a Delphi unit, not sure who manufactures the OEM coils.