Regulars here may know that I bought a 2012 Scion xB with 80k miles for $3000. The reason for the great price is that it has the defective super white paint and it has completely peeled off the roof and is now coming off the body panels in big sheets. This car was used as a security vehicle in a fancy golf resort HOA so it spent almost its entire life going 10-15 mph down residential streets. When I bought it the gauges showed an average MPG of 12.1 and an average speed of 7 mph LOL.
Anyway, it drove fine on the test drive but now 100 miles later it is having a big issue. It started with a little shuddering on acceleration but on the way home I was driving up a hill at 57mph with the cruise control set and it suddenly freaked out. The CEL and Trac off light started flashing, the engine speed dropped then revved hard, and the wheels/transmission started shuddering hard. I braked, kicked it into neutral and pulled over, but after just a few seconds it was gone and the lights went off. I pulled out again and as I approached 50 mph it started shuddering but not as hard. The code reader showed a P0302 (cylinder 2 misfire detected) code. I replaced all of the spark plugs and tried driving the same route again. The slight shuddering was gone but the same big problem happened again at the exact same place under load coming up the same hill, and this time the CEL light stayed on. Same code.
I bought a new Denso coil and replaced #2 today and it immediately made the issue much worse. There was a noticeable misfire at idle that wasn't there before. Putting the original coil back in resolved the idle issue. Thinking it might be a defective replacement I went to Autozone and bought another one, but it had the same issue and also threw the same code at idle, which it didn't even do before.
How does installing a new coil make the problem worse? What should I do next?
I'm really stating to be reminded of why I always preferred buying new cars LOL. My other Scion decided to do strange stuff last week as well. I'm now 1 for 3 with used Scions, and I sold the good one
Anyway, it drove fine on the test drive but now 100 miles later it is having a big issue. It started with a little shuddering on acceleration but on the way home I was driving up a hill at 57mph with the cruise control set and it suddenly freaked out. The CEL and Trac off light started flashing, the engine speed dropped then revved hard, and the wheels/transmission started shuddering hard. I braked, kicked it into neutral and pulled over, but after just a few seconds it was gone and the lights went off. I pulled out again and as I approached 50 mph it started shuddering but not as hard. The code reader showed a P0302 (cylinder 2 misfire detected) code. I replaced all of the spark plugs and tried driving the same route again. The slight shuddering was gone but the same big problem happened again at the exact same place under load coming up the same hill, and this time the CEL light stayed on. Same code.
I bought a new Denso coil and replaced #2 today and it immediately made the issue much worse. There was a noticeable misfire at idle that wasn't there before. Putting the original coil back in resolved the idle issue. Thinking it might be a defective replacement I went to Autozone and bought another one, but it had the same issue and also threw the same code at idle, which it didn't even do before.
How does installing a new coil make the problem worse? What should I do next?
I'm really stating to be reminded of why I always preferred buying new cars LOL. My other Scion decided to do strange stuff last week as well. I'm now 1 for 3 with used Scions, and I sold the good one
