I beg of y’all please help me with this problem. Ive tried everything.
It started about 8 months ago and slowly getting worse. My car misfires horribly but it only starts when I drive the car for around 45 minutes or so. But lately its been starting sooner like just after 15 or 20 minutes. When it misfires I can just turn off the car and let it sit for a few minutes and everything would be back to normal.
When it misfires it is also gradual. It would start after just 45 minutes of driving. It starts just like a little hiccup, then it just get worse to the point where the car wants to shutoff. When I try to accelerate the car tries to cut off. I also have a wideband o2, and when it misfires the A/F ratio goes to 10.xx meaning it’s really rich. So I’m assuming it has to be a spark issue not a fuel. But I may be wrong.
It does not throw any CEL for missfire. Do COP gradually go bad, or they a good and bad deal only.
Only code i have is p0455 which is Evap leak, and p0136 which is the rear o2 sensor.
Could it be my ECU or any other sensors
Plugs have 20k miles
I have MSD COP for around a year.
It started about 8 months ago and slowly getting worse. My car misfires horribly but it only starts when I drive the car for around 45 minutes or so. But lately its been starting sooner like just after 15 or 20 minutes. When it misfires I can just turn off the car and let it sit for a few minutes and everything would be back to normal.
When it misfires it is also gradual. It would start after just 45 minutes of driving. It starts just like a little hiccup, then it just get worse to the point where the car wants to shutoff. When I try to accelerate the car tries to cut off. I also have a wideband o2, and when it misfires the A/F ratio goes to 10.xx meaning it’s really rich. So I’m assuming it has to be a spark issue not a fuel. But I may be wrong.
It does not throw any CEL for missfire. Do COP gradually go bad, or they a good and bad deal only.
Only code i have is p0455 which is Evap leak, and p0136 which is the rear o2 sensor.
Could it be my ECU or any other sensors
Plugs have 20k miles
I have MSD COP for around a year.