Fuel pressure too high

Asked by TexChevy00 Sep 21, 2018 at 09:39 PM about the 2000 Chevrolet S-10

Question type: Maintenance & Repair

2000 S10 LS  2.2 Flex Fuel @ 165,000 miles; Been tracking down a P0171
Lean Bank 1 code with not much luck. Rough idle and hesitation when
accelerating thru 2nd to 3rd gear. Flex fuel filter is one week new. Measured
pressure pre-filter at 70 psi. Measured at the rail, still 70 psi! Flex model has
fuel regulator in the filter, no MAF sensor, and no PCV valve. New TPS,
smoke tested and found small leak where valve cover gas returns to intake,
and used carb cleaner around engine bay with no effects to idle rpms (1K).
Recently changed plugs and wires but not the coil packs yet. Exhaust
manifold was replaced along with the upstream O2 sensor attached to it.
Can't find any threads on too high of fuel pressure and what weird effects I
could expect the computer to produce. Does anybody know what reading I
should see pre and post filter on this model? I used a MicroGuard model
from O'Reilly's. At my wits end with this and feeling defeated.
Any ideas are welcome!

1 Answer

TexChevy00 answered 6 years ago

Fuel pressure regulator inside the flex-fuel filter ended up regulating intermittently. Higher quality filter fixed the issue. Still having the P0171 lean code even though it actually is running very rich. Plugged up my catalytic converter so that's been changed now. Took to a shop and upstream O2 is reading fine when cold but slowly decreases voltage to 0V as the downstream O2 begins to heat up. The whole shop is scratching their heads. Even brought in Chevy folks. No resolution yet. New computer with new wires directly to O2 sensor and still same voltage readings.

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