Do a cylinder balance test, if you find a dead cylinder, check spark--fuel-- compression.

Engine running, you kill cylinders one at a time while watching the rpms. If you kill a cylinder that has no effect on the rpms, it is dead or very weak.

Answered by JDL (expert)
14,402 answers provided

Also to add on this-check the compression and injector for no.3 cylinder

http://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

Note: If it doesn't apply disregard it-

Answered by rasmataz
68 questions asked