Posted to Technical Tips Forum on 2/24/2015
7 Replies
2010 Buick La Crosse CXS 3.6 L with direct fuel injection
system.
Vehicle came into shop with complaint of hard start, runs
poorly, runs rich and may pop back into intake on
acceleration. Vehicle will go into reduced power mode.
Repair history in the past 6 months is New -- High pressure
fuel pump, 2 fuel lines, pressure sensor, bank1 sensor 2
oxygen sensor, #1 injector.
Codes retrieved were P2178 fuel trim rich at cruise or
acceleration bank 1 P2180 fuel trim rich at cruise or
acceleration bank 2 P0089 fuel pressure regulator
performance P0300 P0301 P0302 P0303 P0304 P0305 P0306 P2189
fuel trim lean at idle bank 2
Vehicle was very hard to start. It would crank up run a few
seconds and die like very low of gasoline. Cleared codes and
most codes would return. Also P0088 fuel pressure high and
P0089 fuel pressure regulator performance along with
miss-fire codes. This Fuel rail pressure sensor reading has
been jumping around a lot when running, for example at idle
it might go from 1 Mpa to 6 Mpa. Each Mpa is equal to 145
PSI. With key on engine off the Mpa measurement would stay
steady for example 4 Mpa.The Tech 2 will not communicate
with this model. Call ACDelco and they confirmed that it
will not. Our Autel will though. The Autel has the ability
to control the pressure regulator which is part of the high
pressure fuel pump. As we control the pressure up we should
see a corresponding increase in Mpa in the fuel rail
pressure sensor. The pressure sensor did increase and the
high pressure pump (driven by the camshaft) would start
singing going up to 17 Mpa. It sounds like it is stressed,
as it ought to be. We searched iATN, Google, talked to
dealership and came up with nothing. Tried wiggle wires to
the system injectors, pump and sensor with no change. The
injectors and pressure sensor are under the intake. Pondered
new injectors, ECM, wiring, another pressure sensor?
Removed the intake and checked connection to pressure
sensor, looked fine. Turn key on (will set codes because of
removed intake, throttle, tps etc) watched readings on fuel
rail pressure sensor and noticed they did change when
wiggling connector. Tugged on the 3 wires a little and Boop
the white wire came loose. Replaced the connector with part
# ACD- [2010 Buick LaCrosse CXS, ECM/Inputs/Outputs
Photo] PT2798 (did not show under application we only
found it by the pigtail chart matching up). The pressure
sensor part # is 12621292.
Problem is FIXED
I believe this problem will occur on other direct fuel
injection vehicles because of the location of the sensor and
connector near the top of the heat of the engine.
Daniel from Tennessee
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