Question about 1991 Buick Century
I have changed the following parts with new ones:
spark plug wires
fuel pressure regulator
crankshaft position sensor
I have tested the following and fould them operating correctly:
EPROM chip in computer
all lights in the dash
As this vehicle is not equiped with an EGR system of any kind it is unusual to diagnose. I also installed a boost gauge to monitor for vacuum leaks and it appears to lose vacuum after it is fully warmed up and you press the gas, even slightly. It loses horsepower at this point, and will eventually die if left in park or neutral for any long length of time. It takes a long time to take off from a red light for the lack of power. If I floor it from a stop the engine will miss and sputter and sometimes dies. It seems to be an ignition problem, but I can't seem to find it. The only 2 sensors I haven't replaced yet are the camshaft sensor and the knock sensor, as I can't seem to locate them without taking the engine apart. Chilton's and Haynes have no information as to where these sensors are located. The engine after fully warmed up operates at -20 vacuum at idle and is almost zero if you press the gas pedal slightly.
canister purge valve solenoid? I am at a loss...
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Posted on Jan 02, 2017
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