1998 Ford Ranger rough running

Tiny
CBECKEY
  • MEMBER
  • 1998 FORD RANGER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 194,000 MILES
Running rough so I replaced all spark plugs and wires and that didnt work replaced coil pack and that didnt work whats next
Friday, June 25th, 2010 AT 8:54 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine running rough or misfiring can be cause by the following:

1. Defective spark plug
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. Idle air control valve.
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Saturday, June 26th, 2010 AT 4:48 AM

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