2009 S40 oil in cylinder one.Hi so I have a 2009 Volvo S40 not the turbo it's just front wheel drive standard Volvo. I have not had any problems with this car since I've owned it no dummy lights are on the dashboard no issues whatsoever then all of a sudden one day it started running extremely rough and my engine light came on and I also got a warning message to try to slow or shift up after doing a little research I was led to believe I may need a ignition coil the scanner code OBD2 said misfire cylinder one or two so when I remove cylinder one that's when I noticed a bunch of oil pulled down at the bottom around the spark plug I've been researching and researching trying to pinpoint what that could be I'm getting mixed advice or scenarios I am a recent widow with two teenage daughters and I don't have a ton of money to play guessing games I would like to know if anybody has maybe experienced this or would have a most likely culprit to the problem that would be greatly appreciated thank you so much guys

 

That's usually not a problem. The cam cover can leak slightly into the spark plug wells.

First step would be a scan with a compatible scanner. If for instance it has a code for missfire on cyl 1 - inspect the coil and plug on that cylinder and swap the coil with another (eg 1-2 and 2-1) If the spark plug(s) are worn or you don't know when they have been changed - it would be a good idea to replace the set. Erase the codes, drive car and see what codes come back. If the missfire code moves to the cylinder you just placed the offending coil in - you have pretty much proved you have a bad coil. Replace just that one.

It is possible if the oil gets deep enough (it usually does not) that can create a missfire by itself. New plugs fixes that (the oil will drain into the cylinders and burn off)

 

Yes that all makes sense and the code is saying misfire cylinder one and I have replaced the coils already so my next step is to change the plugs and go from there. Also during my hours of research I have read that the oil filler gasket could be bad and if all those things already mentioned don't fix the problem then to do a compression test to determine if the PCV or piston rings could be it. I'm hoping it's just the plugs. Thank you so much for your assistance I appreciate it.

 

As mentioned above if it's a miss fire its 90% electric , The PCV is a common fault on these cars but it does not cause a miss fire it destroys all the seals but easy to diagnose , the engine whistling noise and is you releave the pressure by removing the dip stick it stops , take the offending spark plug out and see if sparks

 

it would be a good idea to replace the set. Erase the codes, drive car and see what codes come back. If the missfire code moves to the cylinder you just placed the offending coil in - you have pretty much proved you have a bad coil. Replace just that one.