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Kenny
Kenny, BMW Technician
Category: BMW
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Experience:  BMW Master Certifed level 1 Technican
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BMW 530i: i have several codes/ p0174, p0313, p0300, p1349,

Customer Question

i have several codes/ p0174, p0313, p0300, p1349, p1344, p1346, p1353, p1351, p1343, p0171. car runs rough when starting cold, after warming cut engine off , restart and runs smooth. been told vanos could be problem w/ orings, maf sensor . please help thks ,bruce
Submitted: 2 years ago.
Category: BMW
Expert:  Kenny replied 2 years ago.

So below are you faults listed I don't think it is vanos related. I have two ideas on what could be the issue but first I need some info.

 

Do you live in a cold weather area?

Does it always run rough when cold?

Is there any smoke from the tail pipe when this happens?

How long has it been doing this?

Thanks

 

 

P0300 Random/Multiple Cylinder Misfire Detected

P0313 Misfire Detected with Low Fuel

P1349Misfire Cylinder 4 With Fuel Cut-off

P1344Misfire During Start Cylinder 2

P1346Misfire During Start Cylinder 3

P1353Misfire Cylinder 6 With Fuel Cut-off
P1351Misfire Cylinder 5 With Fuel Cut-off
P1343

Misfire Cylinder 1 With Fuel Cut-off

P0171 System too Lean (Bank 1)

P0174 System too Lean (Bank 2)

 

Kenny, BMW Technician
Category: BMW
Satisfied Customers: 968
Experience: BMW Master Certifed level 1 Technican
Kenny and 5 other BMW Specialists are ready to help you
Customer: replied 2 years ago.
i knew what the codes meant, what fixes these codes ?
Expert:  Kenny replied 2 years ago.

Do you live in a cold weather area?

Does it always run rough when cold?

Is there any smoke from the tail pipe when this happens?

How long has it been doing this?

Customer: replied 2 years ago.
i live in va dont think thats classed as a cold weather state , but not sure.doesnt always run rough , sometimes okay , no smoke that i can tell, its been going on for a year or more cold or hot
Expert:  Kenny replied 2 years ago.

My first thought is a clogged cyclonic separator would cause this issue but it is more common in colder weather like weather in the 20s. I would still check to make sure a telltale sign is to remove the oil cap on the valve cover and look for yellow gunk/slime on the cap and just inside the cap. Below is a picture for reference.

 

My next thought is a vacuum leak because of your lean mixture faults (I listed the faults so it is easier for me to read them all at once). I would check the intake boot near the throttle body and idle valve for cracking, I will attach a picture below so you know what to check for.

 

Another Idea is a fault with the fuel system, either a weak fuel pump or a it is bleeding down overnight or a fault with the pressure regulator. You will need a fuel gauge to check this.

 

My last thought could be a MAF but it is really uncommon.

 

 

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