I agree that this is a good thing to try because it's cheap...

...and is good maintenance anyway. But, wouldn't a problem with flow through the MAF cause the PCM to adjust fuel trim accordingly? It seems like the issue would be downstream of the MAF, where un-measured air is getting drawn into the system such that the PCM does not see it, and thus throwing the fuel trims off. And if the MAF was clogged up and causing problems, wouldn't that be more likely to cause a rich condition rather than lean?

What am I missing?

In response to this post by vt_mughal

Posted: 03/18/2018 at 9:35PM

Gearheads, P0171, Powertrain too lean code. What's your diagnosis? ** -- Brown Water 03/18/2018 6:39PM

German ** -- MEHOKIE 03/19/2018 06:58AM

Could be lots. Need more info. -- 48zip 03/18/2018 10:23PM

MAF sensor. Take off your intake plumbing from the air filter to the -- vt_mughal 03/18/2018 9:00PM

I agree that this is a good thing to try because it's cheap... -- MP4VT2004 03/18/2018 9:35PM

It’s not a clogged MAF restricting AF, it’s a dirty... -- No1Hokie 03/19/2018 07:39AM

Seems logical. But its $5, and 30 mintues. We could spend 30 minutes -- vt_mughal 03/18/2018 9:43PM

I won't argue that! -- MP4VT2004 03/18/2018 11:36PM

This is such a fitting DTC for you, BW. (too lean) -- MP4VT2004 03/18/2018 8:15PM

Fetzer valve or bypass line. You’ll need ball bearings & some 3-in-1 oil. ** -- Spud 03/18/2018 7:52PM

And antifreeze, preferably Prestone. No, make that Quaker State. ** -- RoswellGAHokie 03/18/2018 8:01PM

...My old man is a television repairman...I can fix it ** -- chumley 03/18/2018 7:59PM

Clean your MAF sensor... cheap and easy. -- No1Hokie 03/18/2018 7:37PM

Probably a vacuum leak -- Betabeachbum 03/18/2018 7:02PM

I have the P0174 code too, which I guess is bank 2 ** -- Brown Water 03/18/2018 7:19PM

Given problem in on both banks, my money is on vacuum leak ** -- Pylons 03/19/2018 11:30AM

Basically you’re running lean on both banks -- EDGEMAN 03/18/2018 8:29PM

That would definitely give you a lean condition. ** -- EDGEMAN 03/18/2018 7:07PM

What are your fuel trim numbers? -- EDGEMAN 03/18/2018 7:02PM

No earthly idea ** -- Brown Water 03/18/2018 7:03PM

I agree that this is a good thing to try because it's cheap...

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