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2000 Ford Mustang Rough Runinng Engine

Tiny
CISCO777
  • MEMBER
  • 2000 FORD MUSTANG
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 75,000 MILES
During ordinary driving suddenly the engine started running rough at all speeds.
Checks indicate:
An occasional misfiring of cylinder 4 as indicated by the computer codes, and a new pinging sound to the cylinder 4 area.
Also new: a low vacuum (guess due to brakes getting harder).
Sparks to all cylinders check OK, and spark plugs are new.

Suspect bad fuel filter and/or injectors. What is the most likely problem?
Thanks,
FV
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Friday, February 26th, 2010 AT 11:23 AM

1 Reply

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

**Inspect and test the following items:
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.
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Friday, February 26th, 2010 AT 7:35 PM

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