2000 Mercury Cougar hard to figure out

2000 MERCURY COUGAR
125,000 MILES • 6 CYL • FWD • AUTOMATIC
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FUD
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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?
Feb 8, 2008 at 6:48 PM
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MASTERTECHTIM
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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
Feb 8, 2008 at 6:52 PM
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FUD
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hwere can i find all the vacuum line in this compact compartment. have tried to find drawing of them but have had no luck
Feb 8, 2008 at 6:58 PM
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MASTERTECHTIM
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a drawing wont really help. just look and listen really hard, they are tough to find.
Feb 8, 2008 at 6:59 PM