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Hello. 1997 Infiniti Q45 4.1L V8 running lean. 30% fuel trim both banks 1&2 with engine idling at operating temp. sets code p0171.
Snap throttle in Park both sensor go rich. At WOT road test both o2 sensors .9v. Then at idle both o2 are pegged .01v
MAF reading 3.5 g/s at idle.
Did a smoke test, found a leaking intake plenum gasket. Replaced and no change in running condition, still lean at idle. Any tips for next smoke test? EGR leaking?
Someone in the past has replaced MAF and connector pigtail.
Thank you.
