1998 Ford F-150 Repair Question
1998 Ford f150 5.9 Engine, The thermostat housing cracked and filled the channels and ports for plugs, I replaced thermostat housing and blew out ports and ran fine ended up having to change plugs and still runs rough and backfires with no codes what else
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.
8.EGR valve that is leaking.
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-
68 questions asked