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  #1  
Old 02-07-2010, 12:43 PM
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2004 X5 Fault Codes P0171, P0174, P0300, P0301, P0302, P0304, P0305, P0306

My X5 will run ok for a few miles then these code's will show up on my scan tool. I found the Y-Duct that is part of the air intake hose's had large cracks in between the rib's (small ribed section of the y-duct). I tryed to seal them with a silicon that I had used when I installed a [COLOR=blue !important][COLOR=blue !important]pellet [COLOR=blue !important]stove[/COLOR][/COLOR][/COLOR]. It does not slump & dry's flexible. I ran the car a little further this time before the code's came back. I removed the y-duct from the car this time & found 2 more small cracks in between the ribs. I have sealed with the same silicone again, & will let dry overnight.

Does anyone have any other idea's (if anything) that would set these code's. The P0171, & P0174 come up first & then within a few miles the rest of the fault code's show up.
I have ordered the new y-duct.

Thanks you in advance.
Jay
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  #2  
Old 02-08-2010, 07:45 AM
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Quote:
Originally Posted by Jay Vickers View Post
My X5 will run ok for a few miles then these code's will show up on my scan tool. I found the Y-Duct that is part of the air intake hose's had large cracks in between the rib's (small ribed section of the y-duct). I tryed to seal them with a silicon that I had used when I installed a [COLOR=blue !important][COLOR=blue !important]pellet [COLOR=blue !important]stove[/COLOR][/COLOR][/COLOR]. It does not slump & dry's flexible. I ran the car a little further this time before the code's came back. I removed the y-duct from the car this time & found 2 more small cracks in between the ribs. I have sealed with the same silicone again, & will let dry overnight.

Does anyone have any other idea's (if anything) that would set these code's. The P0171, & P0174 come up first & then within a few miles the rest of the fault code's show up.
I have ordered the new y-duct.

Thanks you in advance.
Jay
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The P0171 and P0174 are telling you the fuel system is "lean". These can be caused by bad O2 sensors and vacuum leaks. Check the OBD II codes online. The "300" series of codes are misfires, with the third digit telling you which cylinder. Could be your plug wires.
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Old 02-08-2010, 05:51 PM
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replace both cylinder heads with improved parts.
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Old 02-13-2010, 10:28 AM
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Those look like lean codes to me. Does check engine light come on? I would think replacing the air duct should do it for ya. You might make sure you check all your vacuum hoses too. Same type of problem I had in the past. The above is what worked for me.
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Old 02-13-2010, 11:16 AM
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Originally Posted by killcrap View Post
replace both cylinder heads with improved parts.

Was this reply in the wrong thread? The OP has a 3.0i with the common air duct tear to the idle control valve... As for his random cylinder missfires registered in all cylinders, hopefully it is related.
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  #6  
Old 02-13-2010, 12:48 PM
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Yes the engine light does come on. I am still waiting for the new y-duct. Thanks to all for the advice.

Jay
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  #7  
Old 02-13-2010, 04:14 PM
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When you get the y duct replaced, I think you will be alright. That is most likely related to the miss fire codes. It was in my case as well.
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  #8  
Old 02-14-2010, 02:34 AM
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Report back after you've replaced the Y duct. I'd also suggest to reset the codes and/or remove tha battery cables and touch them together overnight as a poorman's way to make the ECU relearn itself. After a couple days of driving, if you've still got a CEL, then it might be time for another visual inspection or a simple smoke machine test...leaks can sometimes be hard to find w/ the naked eye.
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Old 02-24-2011, 10:48 AM
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Any update? My wife started the x5 this AM with a HUGE cloud of smoke (i was waiting for a rabbit to jump out of a hat..

If it works I'm going to look at it first tonight.

Thanks,
Dave
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  #10  
Old 02-24-2011, 11:47 AM
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What is the part number for Y-duct?
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