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#1
12-04-2008, 02:04 AM
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Well, I will weigh in on this one with my thoughts. Check your fuel pressure. Not so much the pressure itself but more importantly the volume. I received p0171/p0174 a while bank on my D90 and after cleaning the maf/replacing the maf(now I have a spare)/vacuum testing...I pulled the fuel filter and bam, all kinds of stuff came out. As I understand it, if the fuel volume is too low, the ecm will attempt to open the injectors duration to max value, that fuel is then insufficient(lean) to heat the cats up and the maf reacts with strange codes as it attempts to maintain the proper fuel/air ratio. Just my 2 cents and definitly check the vacuum system....
j
__________________
Nobody... nobody trusts anybody now, and we're all very tired... there's nothing more I can do, just wait... RJ MacReady, helicopter pilot, US outpost #31. 
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#2
12-04-2008, 09:12 PM
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I'll definitely check that. I feel like a moron now, but since I've owned it, I have never replaced the fuel filter. I'm guessing the Dr. before me didn't either so I'm sure it could use it.
I'll dig in this weekend, only one more day. Thanks again and yall have a great week. Oh and does anyone have a clue about a voltage range to check if the MAF is still good?
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