Hey everyone! It hasn't been that long since I was on here sharing my issues with my Cooling System Refresh/PCV Service. It has been a month now since I did the work, and everything has been running great up until Saturday. To give some back story, I was driving back from NY towing a trailer (approx. 2200-2300 lbs), while driving on the Interstate going about 60 MPH I suddenly lost power and the CEL started flashing.
I pulled into the breakdown lane, the car was still running but idling very bad (rough and jumping between 600-900rpm). I checked the engine to see if there was anything obvious, but everything looked fine (no fluid loss, etc.). I started the car again and it was still running rough, but I noticed the CEL was never triggered (only flashing before). I wasn't too far from the next exit so I was able to make it off the Interstate and to a conveniently placed Autozone. During the trip off the highway, the CEL came on steady. My Ultraguage (OBDII reader) did not show any active or pending codes though, which I thought was odd. I had an OBDII scanner in the car too and I checked with that, and got nothing too.
I tried unplugging all of the coils one by one to see if I can narrow it down, and it seemed like cylinder #1 did not change when unplugging the coil. Although after plugging all the coils back in and sitting for a bit it was definitely running better.
I had Autozone check the codes on my car, and they came back with 5 trouble codes:
- P0300 - Random/Multiple Cylinder Misfire Detected
- P0301 - Cylinder 1 Misfire Detected
- P0302 - Cylinder 2 Misfire Detected
- P0303 - Cylinder 3 Misfire Detected
- P0304 - Cylinder 4 Misfire Detected
I cleared the CEL before driving again, and the only code that came back (at least on the Ultragauge) was P0301. I already had new ignition coils, spark plugs, and a fuel filter set aside that I've been meaning to put in, so I replaced all of those after getting home. But this made no difference, it is still misfiring/running rough. You can hear it at the exhaust, and sometimes it sounds worse than other times (just idling).
Sorry for the novel, I just wanted to give as much info as I could. This one is really confusing me, but I am going to get VIDA on it tonight to see what that gives me..