Got P0305 P0304 P0302 Codes last night
 

I am hearing about this Y-Tube, but not sure of the location. Can someone post a pic of it and location?

I doubt 3 coils will go bad at one time, so looking at other solutions.

Thanks,
Leo

Is this first pic the Y Hose?

Does it run okay? If so, it's not bad coils. With three bad ones, it'll run like sh!t. But to rule it out, you could swap them around and see if the fault code changes. At least you can rule that out as a possibility. But it's pretty unlikely to have 3 go at the same time.

I'm not sure what a "y tube" is, but the part in the photos is commonly referred to as the intake boot. Those are known to crack and split, which causes a vacuum leak. If it's bad enough, it will trigger the check engine light. But it won't be a misfire code. It'll be something along the lines of a fuel trim error. Another very common cause for a vacuum leak is the oil separator system. You don't mention the mileage, but if it's anywhere north of 100K, I'd be expecting to replace that system. Again, you'd be getting a fuel trim error and not a misfire.

Could also be bad spark plugs. If they're original, they're probably due for replacement.

My wife had to limp it home that night. I moved the car before we went camping on Monday and it ran fine. Sound like when it gets warm

It's high mileage about 210K, never heard of the oil separator system. Can you explain more on that? It's does burn about 1 quart of oil every week or so. Gas mileage I am assuming it's fine as my wife drives this car.

A quart of oil per week? Well, as they say, "There's yer problem!" That is not normal oil consumption. The M54 engine in your X5 is known for being an oil burner, but not to that extent. You may very well have fouled plugs causing your misfires.

The oil separator, also known as the CCV (crankcase vent valve) is a system of plastic/rubber tubes and the actual oil separator itself. It circulates crankcase vapors through the intake manifold to burn them off. Some engine oil also makes it into the system and is separated from the vapors and drained back into the oil pan. These rarely last much past 100K miles and are a very common cause of vacuum leaks. In extreme cases, it's possible to actually suck oil out of the oil pan and feed it into the intake manifold.

These systems and their problems are well documented. A few searches for "BMW M54 CCV" will provide lots of very informative reading material.

Tried to search using your keywords and got this.

Sorry - no matches. Please try some different terms.
The following words are either very common, too long, or too short and were not included in your search : BMW, M54, CCV

Yes, did a google search after I had posted that and found a great video on how to change that out as well as the hoses. Thanks for the tip. :thumbup:

Cool. It's a time-consuming, but not overly-technical job. Change out the spark plugs, too!

Replaced the Y-Tube. Replaced all plugs with NGK Irridium BKR6EIX. Gaps at .029 unchanged.

Old ones were BKR6EQUP, which were changed out a couple years ago.

Here are the old ones, left is #1. You can see that #4 had some oil on it.

I erased the codes. Took it for a spin, it doesn't seem to have the power it used to have. Also, about 6 miles into the test drive, I decided to punch it. Got a check light and it started to run like crap. Got home and pulled a P0305 code.

Also, forgot to mention, I switched the 2,4 and 5 coil to the #1,2 and 3 cylinder to make sure it wasn't coils. Test proves the coils are good.

I know I still have to fix the oil issue but need to resolve this CL first. Any thoughts?