1991 Ford Mustang check engine light

Tiny
LANDLOCKED SAILOR
  • MEMBER
  • 1991 FORD MUSTANG
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 147,000 MILES
The check engine light has been coming on intermittently lately. Sometimes when it comes on it will stay on all day and some days it won't come on at all. When it does come on the RPM's drop down to around 450 or 500 rpm. When the light goes off the rpm's come back up to normal. Is there a way that I can reset the check engine light so that it doesn't keep coming on or is there some other problem that I can't seem to locate/
Sunday, May 2nd, 2010 AT 4:43 PM

1 Reply

Tiny
BLUEOVALPOWER50
  • MEMBER
  • 10 POSTS
Check the engine codes (analog voltmeter and jumper wire) and see wut code(s) the pcm is throwing on the cel for, but sounds like its running lean and the pcm is retarding the timing causing it to lower the rpms, o2 sensor, ect sensor
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Friday, May 7th, 2010 AT 5:28 PM

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