Poss fuel pump?

MCABEE.DUCK

MEMBER
2000 CHEVROLET SILVERADO
V8
2WD
AUTOMATIC
150,000 MILES

I have a 2000 chevy silverado 1500 5.3L. I am getting a P0300 (random cylinder misfire) and P0131 (o2 sensor bank 1 sensor 1) code. My service engine light is on, and sometimes flashes. I am getting an extremely rough idle and strong exhaust smell. The gas has a slow reaction. The truck will idle rough, then there will be a sudden burst and it will be smooth for a little bit.

There is also a lot of carbon buildup at the exhaust, I have fun seafoam through the vaccuum line a couple of times. There is a brown liquid coming out of the exhaust.

Is my fuel pump the culprit?

Thanks!

3 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Engine running rough or misfiring can be cause by the following:

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

1.Defective spark plugs
2.Inadequate spark/coil,defective spark plug wire.
3.Lack of compression
4.False air leakage.
5.Faulty fuel injectors.
6.Insufficient fuel pressure.
7.Contaminated fuel.
8.EGR valve that is leaking.
9.Oxygen sensors.
10.Throttle position sensor.
11.Manifold absolute pressure sensor
12.Mass Airflow Sensor
13.Idle air control valve