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Old 07-10-2008, 08:51 PM
99f150xlt4.2 99f150xlt4.2 is offline
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Join Date: Jul 2008
Posts: 1
Driving with lean trouble codes

The CEL light came on for me the other day and low and behold p0171 and p0174 codes came up...the search begins. I have a few places I'm going to start looking for a vacuum leak but my question is; over the next few days as I try to locate the leak, is it still okay to drive the truck even though it's running lean? If I don't find the leak right away the last thing I want to do is burn a valve or something. Any thoughts would be appreciated. My truck is a 99f150 4.2l.
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