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Suddenly runs rough and engine lite came on.

Tiny
JLCASE
  • MEMBER
  • 1994 FORD EXPLORER
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 90,000 MILES
Truck suddenly runs rough and engine lite came on. Changed mass airflow sensor, no help. Older code scanner will not connect to truck. Smell of gas at tail pipe running rich. Any suggestions?
Wednesday, August 5th, 2015 AT 5:01 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,871 POSTS
Running rough is the typical sign of a misfire, usually spark-related. Diagnostic fault codes won't tell you which cylinder(s) are misfiring on a '95 and older vehicle. If you can't read the fault codes, start with the basics; spark plugs and wires.
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Wednesday, August 5th, 2015 AT 6:00 PM

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