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1999 Mercury Cougar Running Rich

Tiny
AARONCOUGAR
  • MEMBER
  • 1999 MERCURY COUGAR
  • 6 CYL
  • FWD
  • MANUAL
  • 128,000 MILES
I have a high performance clutch installed and a ram intake installed and dual exhaust (don't know if these are the cause, but.) : My check engine code says running rich bank 1 and 2. Any pointers on how to fix this?
Friday, January 15th, 2010 AT 1:58 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Probable causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.
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Friday, January 15th, 2010 AT 3:19 PM

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