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#1
02-07-2010, 01:43 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 <!-- / message --> 
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#2
02-08-2010, 08:45 AM
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Quote:
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#4
02-13-2010, 12:16 PM
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Quote:
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.
__________________
"When you do things right, people won't be sure you've done anything at all" (Bender, futurama) You make something idiotproof, they'll make a better idiot You think professional is expensive, just wait until you pay for amateur. Never let your sense of morals prevent you from doing what is right. Examine what is said, not who speaks. X5 pics RIP 4.6is..... 2003 4.6is 
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#5
02-13-2010, 01:48 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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#6
02-13-2010, 11:28 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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#7
02-13-2010, 05:14 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
02-14-2010, 03:34 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.
__________________
 650hp 10 X5///M - Stage 2, Vibrant 1794's , gutted cats, custom intake, AC Forged 22's 325hp 98 BMW 740iL - ///M5 6spd, www.bavengine.com w/ Performance Option, electric fan, CF intake tube w/ heatshield, Mag 14816 w/ notched bumper, Bilstein/H&R Stage II/Powerflex 600+hp 02 Harley F150 - MHP900 Stage 3 engine, KB2.3, 8# lower, 60# inj, Walbro FP's 135hp 01 TL1000R - M4 full exhaust, K&N, Yosh box, -1/+2 gears, 2CT's
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