Question about 2004 Mercury Mountaineer

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Engine sounds like a diesel

I have a 2003 Mercury Mountaineer AWD V8...engine knocks, almost sounds like a diesel engine now. Not sure what the problem is but I do know that either my inbound #2 O2 sensor is bad and if thats not it its the cat converter. But yeah, engine sounds like a diesel. Not sure if its bearings gone bad on one of my tension pulleys or what.

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  • yadayada
    yadayada May 11, 2010

    if the engije sounds this bad it is damaged and will need an overhaul.

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I would check the oil pressure with a "Wet Gauge" to check what the oil pressure is. I don't think the O2 sensor would cause the sound.

Posted on May 11, 2010

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Need more info...

Whats the mileage??

Have you checked the oil level??

Take to Auto Tech to be sure.

Posted on May 11, 2010

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1 Answer

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I need a new transmission in my 2004 Mercury Mountaineer V8 AWD, how much should I expect to spend?


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Feb 08, 2010 | 2003 Mercury Mountaineer

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My 2003 Mercury Mountaineer V8 AWD transfer case needs to be replaced. What problems can occur if left untreated?


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Oct 27, 2009 | 2003 Mercury Mountaineer

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Starter loction


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no you have to remove the vent between the hood and the windsheild its on the out side of the car it sounds like your freshair vent is stuck open

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