CODE P1313

Hi,

I don't think it would be 50/50 because there are more than two things that can cause a misfire. However, if it sat for a while that is the best place to start.

If the catalytic converter is damaged, it will not cause a misfire. If this is your only code for now, then more than likely the converter is okay. I would expect you to have a catalytic converter inefficiency code as well.

If the plugs do not fix it, I attached a list of possible causes. First on the list is plugs so again, start there and let me know if that is not it and we can test the remaining items.

Thanks

Had the car returned to me after a $560.00 tuneup with the comment “ you have a cylinder misfiring” so I wonder how a good mechanic tuned a car up with a cylinder misfiring. But the check engine light is still on. I will look at the plug wire and the coil and look for a different shop if I can’t change it easily. It is cylinder 5. is it easy to change that coil?

Unfortunately, these days a tune up is nothing more than changing plugs and some filters. They don't actually tune the engine like they did with carburetors and setting timing. They probably should have not just returned it with a misfire but unfortunately, some shops are like that.

As for the coil. It could be the issue. I attached the process. It is pretty straight forward. However, we need to find out if there is a spark. If you have spark then the coil is not the issue. At that point, it could be a fuel injector or loss of compression.

https://www.2carpros.com/articles/how-to-test-engine-compression

My neighbor was a Ford Mechanic before he joined the Navy and he is going to help me. We will check for a spark but I figure might as well replace all the coils since we are right there anyway. Can I get any coil from Amazon that matches the description on Amazon, or is there a particular crepe to avoid? Will probably do that this weekend.

Don’t know why it said crepe. I meant is there a particular type of coil that is preferred?

I would just read the reviews. I looked through the most commonly available and didn't see any brands that you must stay away from. So based on reviews and a price that is agreeable to you is what I would go with.

Let me know how it turns out and we can move onto the next thing if the coil is not it. However, your neighbor should know next thing is to check compression and to make sure the injector is firing.

Keep in mind, the engine needs three things to run. Spark, Fuel, and compression. Since you only have a misfire on one cylinder I am sure you are missing one of these.