2012 451 with 128,000 trouble free miles (75% freeway)
Been having the following issue for the last 8 months. I’m getting close to having to take it in.
Cylinder 1 misfire and occasional random misfire codes and a post catalytic fuel trim lean code. It was also stalling at idle when I came to a stop
So; I replaced all three plugs and coils. Ran sea foam in the throttle body and use MMO. I also replaced both O2 sensors. This cleared the fuel trim lean code, no longer stalls and reduced the random cylinder misfire codes. I did a vacuum leak check and couldn’t find any leaks. I’m still getting a cylinder one misfire code.
I am going to replace the fuel rail and injectors this week.
It’s getting to the point where I may need to verify fuel pressure and consider a fuel filter change? Even if the filter isn’t the cause it’s proably due for a change anyway.
If i pull the plugs, run a borescope will I be able to see the valves easily from this vantage point? I am also not sure how to do a compression test either. That is uncharted territory for me.
Is there anything I’m missing? Considering bringing it in after I rule out the injectors. That would leave a bad valve or fuel pump and or filter right?
It runs fine once driving but idles rough.
Thoughts?
Been having the following issue for the last 8 months. I’m getting close to having to take it in.
Cylinder 1 misfire and occasional random misfire codes and a post catalytic fuel trim lean code. It was also stalling at idle when I came to a stop
So; I replaced all three plugs and coils. Ran sea foam in the throttle body and use MMO. I also replaced both O2 sensors. This cleared the fuel trim lean code, no longer stalls and reduced the random cylinder misfire codes. I did a vacuum leak check and couldn’t find any leaks. I’m still getting a cylinder one misfire code.
I am going to replace the fuel rail and injectors this week.
It’s getting to the point where I may need to verify fuel pressure and consider a fuel filter change? Even if the filter isn’t the cause it’s proably due for a change anyway.
If i pull the plugs, run a borescope will I be able to see the valves easily from this vantage point? I am also not sure how to do a compression test either. That is uncharted territory for me.
Is there anything I’m missing? Considering bringing it in after I rule out the injectors. That would leave a bad valve or fuel pump and or filter right?
It runs fine once driving but idles rough.
Thoughts?