Originally posted by TourDeForce:
To diagnose the MAF, could he just unplug it & let the internal fuel mapping program take over?
Quick answer - No.
His problem is the P0171 & P0174 codes, IIRC (this thread has become longggg...). If you disconnect the MAF and operate under the computer's built-in tables, there is no input reference measurement of the intake air charge against which the computer can compare exhaust gas readings. This diagnostic step is useful when there is a gross failure of the MAF, but that does not appear to be the case here.
In my opinion, the MAF is less likely to cause this problem than are the aforementioned air leaks. Air leaks in the intake and vacuum system WILL cause this exact problem.
Steve
98 Contour SE Sport 2.5 Duratec ATX The wifey's car
89 Taurus SHO - 246K miles
94 SHO ATX - 190K
1997 F-150 5.4L ATX - The Workhorse 150K.
ANY THREAD WITH "OMG" or "WTF" ETC IN THE TITLE WILL BE IGNORED!
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