Syntek
Senior Member
- Joined
- Jan 18, 2016
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- Location
- Los Angeles, CA
- Vehicle(s)
- 2019 PWP Civic Si Sedan
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- #1
Okay lads, I'm trying to figure out what the hell is going on exactly with this car and see if this is something simple I can fix on my own or if it's out of my control/fault and I need to warranty it out. (I've been tuned most of the time + running K&N SRI)
Been having a misfire on cold start only. These past two days it's gotten bad enough that the CEL is now flashing on/off and going into limp mode. It takes restarting the car after it warms up a bit to get it going normal again. It's been doing this on both stock and tuned base maps. The car ONLY misfires on cold start
First thing I did was inspect and change the spark plugs at 30,000 miles. The plugs looked normal and not fouled, no signs of soaked sparks or white ash, burning oil or carbon deposits. Didn't help. Next step is I swapped the coil with cylinder 1 and 4 and flashed the car back to stock and drove around for a bit and went home. Following morning I still got the same symptoms and P0301 still came up so that rules out if it was the tune or the coils.
Not really sure where to go from here now or what to inspect before I call it quits and just have Honda look at it. My next step is to probably throw in some concentrated full fuel system cleaner and going to Chevron (I use shell 91 80% of the time) to rule out if it's gas related or not.
Any ideas? Thanks
Side Note: Big shout out to @dc2turbo for taking the time to look at my datalog. Everything looked normal to him.
UPDATE: Honda fixed the issue and replaced the injectors under warranty. Car is fixed now and no longer misfiring.
Been having a misfire on cold start only. These past two days it's gotten bad enough that the CEL is now flashing on/off and going into limp mode. It takes restarting the car after it warms up a bit to get it going normal again. It's been doing this on both stock and tuned base maps. The car ONLY misfires on cold start
First thing I did was inspect and change the spark plugs at 30,000 miles. The plugs looked normal and not fouled, no signs of soaked sparks or white ash, burning oil or carbon deposits. Didn't help. Next step is I swapped the coil with cylinder 1 and 4 and flashed the car back to stock and drove around for a bit and went home. Following morning I still got the same symptoms and P0301 still came up so that rules out if it was the tune or the coils.
Not really sure where to go from here now or what to inspect before I call it quits and just have Honda look at it. My next step is to probably throw in some concentrated full fuel system cleaner and going to Chevron (I use shell 91 80% of the time) to rule out if it's gas related or not.
Any ideas? Thanks
Side Note: Big shout out to @dc2turbo for taking the time to look at my datalog. Everything looked normal to him.
UPDATE: Honda fixed the issue and replaced the injectors under warranty. Car is fixed now and no longer misfiring.
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