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2000 Mercury Cougar hard to figure out

Tiny
FUD
  • MEMBER
  • 2000 MERCURY COUGAR
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 125,000 MILES
I have changed the egr valve, mass air flow sensor, o2 sensors, and it still comes back on the compiter ckeck that the o2 sensors are bad (burning lean) if I unplug the mass air flow sensor it will run at about 80% efficiant. What to do next?
Friday, February 8th, 2008 AT 6:48 PM

3 Replies

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
Check your engine for a vacuum leak, this is what I usually find for lean codes. Try spraying a little carb cleaner around the vacuum lines or intake manifold base and see if the idle changes, this will determine where the leak is. Hope this helps
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Friday, February 8th, 2008 AT 6:52 PM
Tiny
FUD
  • MEMBER
  • 4 POSTS
Hwere can I find all the vacuum line in this compact compartment. Have tried to find drawing of them but have had no luck
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Friday, February 8th, 2008 AT 6:58 PM
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
A drawing wont really help. Just look and listen really hard, they are tough to find.
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Friday, February 8th, 2008 AT 6:59 PM

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