A little background: I drive a 2013 Land Rover LR2 (Freelander 2) with a ford ecoboost 2.0 L engine. When I start my car it runs fine for about 5 minutes or so, but after that the engine starts to idle roughly. When I accelerate hard to get up to speed on the highway for example, it stumbles a bit. However it runs fine with gradual acceleration.

When I first noticed this issue, I ran the error codes and got a persistent misfire in cylinder 4 (P0304). However, the misfire was inconsistent and only registered a total of 4 times in 15 minutes of idling despite the obvious rough idle. Since then, I’ve replaced my spark plugs, fuel injectors, pvc valve, cleaned the air intake valves and throttle body. Now I no longer get any error codes and it runs somewhat better, but still idles quite roughly and still jerks a bit when accelerating hard.

During troubleshooting I swapped coil packs with no change. I ran a compression test as well and found consistent pressure in all 4 cylinders.

Not sure where to go at this point and could use some advice. Thanks in advance.

 

I guess the first question to ask is how many miles are on it. Could be the ecoboost coking issue.

 

Most OBD2 readers will allow you to plot a chart of the fuel pressure. If you notice it is out of range or jumps around while driving, you may need to replace your fuel pressure sensor which is not a big job. There are other threads on this forum going into details on how to do that.

 

Cracked turbo casing? Its pretty common as well.

 

Even more common is that it may be time to change your ignition coils and plugs.

 

That's definitely a potential issue with the 3.2 i6, the other threads may address that engine, not the ecoboost.

The good thing about the ecoboost is that there are a LOT of them out there, so you can probably find entire forums dedicated to that.