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1991 Cadillac Brougham Engine Runs Rich

Tiny
JGROFF05
  • MEMBER
  • 1991 CADILLAC BROUGHAM
  • V8
  • 2WD
  • AUTOMATIC
  • 191,000 MILES
My car was running rich as i have been having rough ilde problems when I come to a stop after interstate driving. To fix this idle I put the car in park and floor the gas pedal slowly to the floor and this black and greyish smoke comes out the tailpipe. Please let me know what all the things are



http://www.2carpros.com/forum/automotive_pictures/333322_1991_cadillac_brougham_1633300x189_1.jpg

that could cause it to run rich.
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Monday, February 22nd, 2010 AT 1:48 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi jgroff05, Welcome to 2carpros and TY for the donation.

Probable causes of an engine running rich are as follows:

1. Fuel pressure not within specs. Can be cause by restricted fuel return line or defective fuel pressure regulator.
2. Defective Oxygen Sensors.
3. Leaking injectors.
4. Coolant temperature sensor out of calibration.
5. Restricted air intake system.
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Monday, February 22nd, 2010 AT 5:27 PM

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