Mbyoung424
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- Mar 8, 2025
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Long story short, invest in a good OBD2 scanner then check, clean and gap or replace the spark plugs before anything else.
This started a few weeks ago when I was bedding in some new brake pads to combat the vibrations under breaking. I had driven about 130 miles at cruise speed on the hwy before getting to a point where I could safely speed up and break without affecting others. Car started to misfire out of nowhere under acceleration and eventually threw the Malfunction Indicator Lamp. As soon as I let off the gas it went away. I took it easy for the last few miles of my trip and it seemed fine.
On my way home the following week, it went into limp mode as I accelerated to merge onto the hwy. I had to pullover immediately and restart the car. Drove fine as long as I took it easy. Tried passing someone and it got worse and the MIL stayed on. To the point I had to pull off the hwy and thought I was going to need a tow. Was rough with any kind of gas, seemed like something in the rear drivetrain, smoothed out when coasting, but got worse in neutral. Again it all went away when I turned the car off so I continued home and got the codes read the next morning.
I had misfires on cylinders 2,4 and 6. Started looking through threads and found one with the exact symptoms. One of the responses listed a number of things the dealership did before fixing the issue. In their case, it ended up being a bad SOLENOID ASSY-VARIABLE FORCE (24378-3L100). Compared to the pain it appears to be to change the spark plugs and the ease in which it is to replace this part, I bought it and hoped for the best.
It didn't fix the problem so I bought an OBD-2 tester and hoped that things would be better after clearing the codes since Autozone didn't do that. Still no luck. After I cleared it the first time, I got a #4 cylinder misfire on the way to take my kid to a B-day party. On the way home, I got a #6 cylinder misfire.
Car is a 2018 and I just broke 30k on it, but I'm not the original owner so no warranty. Started comparing spark plugs and it seems like Denso and HKS are the go to. Ended up buying Denso solely based off them being the fastest to ship (hoping to get them prior to my nest long drive) and the mixed reviews saying one is better than the other.
Since they're on the easy side to replace, I decided to take a look real quick. Pulled 2, 4, and 6 out and they all had decent carbon build up and were horribly gapped. Oddly enough, they were the Denso 5347's. Cleaned them all, gapped to .020, out on some DE grease and went for a quick test drive. No codes and acceleration is back.
This started a few weeks ago when I was bedding in some new brake pads to combat the vibrations under breaking. I had driven about 130 miles at cruise speed on the hwy before getting to a point where I could safely speed up and break without affecting others. Car started to misfire out of nowhere under acceleration and eventually threw the Malfunction Indicator Lamp. As soon as I let off the gas it went away. I took it easy for the last few miles of my trip and it seemed fine.
On my way home the following week, it went into limp mode as I accelerated to merge onto the hwy. I had to pullover immediately and restart the car. Drove fine as long as I took it easy. Tried passing someone and it got worse and the MIL stayed on. To the point I had to pull off the hwy and thought I was going to need a tow. Was rough with any kind of gas, seemed like something in the rear drivetrain, smoothed out when coasting, but got worse in neutral. Again it all went away when I turned the car off so I continued home and got the codes read the next morning.
I had misfires on cylinders 2,4 and 6. Started looking through threads and found one with the exact symptoms. One of the responses listed a number of things the dealership did before fixing the issue. In their case, it ended up being a bad SOLENOID ASSY-VARIABLE FORCE (24378-3L100). Compared to the pain it appears to be to change the spark plugs and the ease in which it is to replace this part, I bought it and hoped for the best.
It didn't fix the problem so I bought an OBD-2 tester and hoped that things would be better after clearing the codes since Autozone didn't do that. Still no luck. After I cleared it the first time, I got a #4 cylinder misfire on the way to take my kid to a B-day party. On the way home, I got a #6 cylinder misfire.
Car is a 2018 and I just broke 30k on it, but I'm not the original owner so no warranty. Started comparing spark plugs and it seems like Denso and HKS are the go to. Ended up buying Denso solely based off them being the fastest to ship (hoping to get them prior to my nest long drive) and the mixed reviews saying one is better than the other.
Since they're on the easy side to replace, I decided to take a look real quick. Pulled 2, 4, and 6 out and they all had decent carbon build up and were horribly gapped. Oddly enough, they were the Denso 5347's. Cleaned them all, gapped to .020, out on some DE grease and went for a quick test drive. No codes and acceleration is back.
