2003 Sport Trac P1074 persistent code

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Tom Angelucci

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Dec 8, 2024
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What engine do you have?
V6 engine
What year is your Sport Trac?
2003
What Generation is your Sport Trac?
1st Gen Owner
Hi All new to forum and engine thread. 2003, XLS with 210k miles. Pesky code has me and my mechanic chasing our tails. Initial code was lean bank 1. All lines checked good, no vac leaks, maf good. Upstream o2 sensors replaced, smoke tested for vac leaks all good but code came right back. Now get lean bank 1 and sometimes bank 2? Gettng 'occasional' long cold crank, found low fuel pressure way lower than 65psi, so may replace fuel pump next. Also occasional slight warm engine miss. Are we missing anything,? want to cover basics before big injector job. Thanks.
 
Hi All new to forum and engine thread. 2003, XLS with 210k miles. Pesky code has me and my mechanic chasing our tails. Initial code was lean bank 1. All lines checked good, no vac leaks, maf good. Upstream o2 sensors replaced, smoke tested for vac leaks all good but code came right back. Now get lean bank 1 and sometimes bank 2? Gettng 'occasional' long cold crank, found low fuel pressure way lower than 65psi, so may replace fuel pump next. Also occasional slight warm engine miss. Are we missing anything,? want to cover basics before big injector job. Thanks.
Update: Most recent second code was P0171 in addtn to orig P0174.
 
Can the EGR pressure feedback sensor cause probs like the egr/map gizmo on later trucks? Maybe check with a scanner and see if "baro" looks right for your elevation. I don't recall what signal equals what elevation etc, I have seen "baro" reading fluctuate though, and that caused all manner of lean codes and stumbling etc..

Maybe someone will chime in with fuel pressures at idle etc, I was thinking idle was in the 40psi range but I'm not at all sure about that
 

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