1999 Mercury Cougar Running Rich

1999 MERCURY COUGAR
128,000 MILES • 6 CYL • FWD • MANUAL
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AARONCOUGAR
  • MEMBER
  • 3 POSTS
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?
Jan 15, 2010 at 5:58 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 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.
Jan 15, 2010 at 7:19 AM
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