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ca-trooper 6/23/2018

1999 Isuzu Trooper S 6 Cyl 3.50L


hard to find vacuum leak on 1999 Isuzu Trooper 3.5L 142k mi operating at 8000 ft altitude

Check engine light after warm during hard acceleration. Other problem is high oil consumption: 1 quart/500 mi. Leak on rt side spark plug hole gasket causes oil on plugs. Will replace, but don't think this causes lean codes. No oil on plug tips. Found no vacuum leaks by spraying. No oil leak visible.
P0137 - o2 sensor low voltage, b1s2
P0157 - o2 sensor low voltage, b2s2
P1171 - fuel system lean during acceleration.
freeze frame data:
engine load: 66.27%
engine rpm: 3634 rpm
speed: 39 mph
coolant temp: 159.8F
long term fuel % trim - b2: 3.12%
short term fuel % trim- b2 : 1.56%
long term fuel % trim - b 1: 3.91%
short term fuel % trim -b 1: 1.56%
MAF air flow rate: 64.79 grams/sec
intake manifold pressure: 0.72 atm
fuel system status: 3) open loop: engine load OR fuel cut due to deceleration
Have already: replaced and cleaned upper and lower gaskets. new MAF and MAP sensors. replaced b2s1 o2 sensor. replaced fuel filter. reset pcm. seafoam in crankcase and gas t

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