P171 cold weather only???
11-13-2018, 05:58 AM
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Location: Little Rock Arkansas
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P171 cold weather only???
As i said when it gets under 35 degrees or so the check engine light comes on and the code that comes up is the p0171 comes up witch I believe is a bank one lean code.... So I looked it over and replace EGR valve and hose, fix a few broken vac lines and also changed the fuel filter ( started there just found the other stuff when under the hood) and still no change few days later it gets up to about 45 degrees and check engine light doesn't come on runs good for a few days them this weekend it gets cold again and as soon as I start the truck boom dam light comes back on..... So what could it be yall.... I'm thanking maybe map sensor or ambient air temperature or whatever you call it
Last edited by Chrusdunaway3; 11-13-2018 at 06:01 AM. Reason: Miss worded
11-13-2018, 08:19 AM
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Lets start out by telling us what you own.....
11-14-2018, 11:53 AM
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Same thing here, it turned out to be my intake manifold gasket. When it first started, it was just in the cold. That's because the air is more dense in the cold, and the plastic intake shrinks in the cold.