p0171 and p0174 codes

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Feb 21, 2007 | 11:12 PM

micker030

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p0171 and p0174 codes

I have a 99' f150 4.6l and i just did a plug and wire job on it..20 miles later its throwing a p0171 and p0174...anybody help?

Feb 22, 2007 | 09:00 AM

projectSHO89

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From: St Louis

You now have a vacuum leak which might be anywhere between the MAF sensor to the intake to any of the hoses coming off the manifold, including the notorious PCV hose elbow.

Steve

Last edited by projectSHO89; Feb 22, 2007 at 09:05 AM.

Feb 22, 2007 | 10:54 AM

beekermartin

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Check all your vacuum lines. I had the same problem. I found three hoses that had holes in them. There are a lot of hoses but start at the pcv valve. You'll probably find the problem there.

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