Compression Ignition Addict
Join Date: Jul 2010
Location: Falls Chruch
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Could be fuel pressure, up pipes, boost leak, bad injectors, bad o-rings, all sorts of stuff.
I tried everything short of new injectors and found very little impact on my fuel mileage. I finally replaced them with a set of used stage 1s and had an immediate improvement on mileage.
Have you reset your PCM after replacing the bad map sensor? Do the boost numbers now match?
Nonconformist. Functionality over bling.
My three rules for 7.3l troubleshooting: 1) Replace CPS and keep a spare. 2) Replace FPR and know your fuel pressure. 3) Hook it to a scanner and check for codes.