lean afr's

[beniger]

my air fuel ratios are very lea 16-17 while driving normally and at wot it's off the chart i haven't boosted or seen boost for some time now. I've checked my regulator still ok and o2 is ok post a log and video soon is my pump going out? i'm waiting to add my holset and safc once i fix this problem if ever. Everything is stock except my exhaust and my evo 8 fp trying to eliminate every possiblity. Help

 

[rstchris]

Check fuel pressure while idling/ driving.

 

[beniger]

how can i do it with my data logger what will show up as the base pressure of 37.5 edit: have 1.8g

anyone else have some insights?