X5 4.8i Bank 1&2 too lean

[Juan35i]

I'm getting this codes bank 1&2 running too lean any ideas? It also run rough and the rpms going up and down on idle.

[Lucky John]

Originally Posted by Juan35i

I'm getting this codes bank 1&2 running too lean any ideas? It also run rough and the rpms going up and down on idle.

I am new to the X5 world so take my thoughts with a grain of salt. Sounds like you don't have good gas flow. The things I would check go like this, fuel filter (I don't even know if they have one), injectors, fuel pump, clogged fuel lines or lines that are collapsing/expanding. Then you get into fuel mapping and coding.

How many miles, has it sat for a long time? Did you put some off brand of gas in it? If you're driving don't let it ping especially going up hills-this is bad for the engine.

[bmwx5er]

Originally Posted by Lucky John

I am new to the X5 world so take my thoughts with a grain of salt. Sounds like you don't have good gas flow. The things I would check go like this, fuel filter (I don't even know if they have one), injectors, fuel pump, clogged fuel lines or lines that are collapsing/expanding. Then you get into fuel mapping and coding.

How many miles, has it sat for a long time? Did you put some off brand of gas in it? If you're driving don't let it ping especially going up hills-this is bad for the engine.

I'd also check for vacuum leaks and failing O2 sensors.

[Juan35i]

It has 117k miles but it started doing it when I had someone replace timing cover gaskets. I checked today and found this broke tho. Would that cause codes or engine to run rough. I always use good gas and keep maintenance up to date.

[Juan35i]

Here is another picture this is the air line that goes into the valve cover.

[xpl0sive]

yes those are vent lines that are part of the PCV system. Your car should run very rough if they are broken open like that. They all crack/break at some point as they are made of cheap brittle plastic. They aren't fun to replace and aren't cheap.
Hard to tell exactly which ones are broken, here is a link for the crankcase vent pipe

http://www.realoem.com/bmw/enUS/show...diagId=11_3830

another breather line

http://www.realoem.com/bmw/enUS/show...diagId=13_1034

[Juan35i]

Originally Posted by xpl0sive

yes those are vent lines that are part of the PCV system. Your car should run very rough if they are broken open like that. They all crack/break at some point as they are made of cheap brittle plastic. They aren't fun to replace and aren't cheap.
Hard to tell exactly which ones are broken, here is a link for the crankcase vent pipe

http://www.realoem.com/bmw/enUS/show...diagId=11_3830

another breather line

http://www.realoem.com/bmw/enUS/show...diagId=13_1034

Yup, the first link is the broken one!!!

[SamBimmerMan]

I have a similar car and I also broke the pcv hose while adjusting the timing chain, by car started idling roughly sometimes as well, mostly when I start it or at stoplights at low rpm’s, it stalled out once on me, I fixed the hose with electrical tape but not sure if that is holding it together, the x5 2007-2010 model has a recall for the pcv heater, maybe that’s something bmw could fix?