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post #1 of 16 (permalink) Old 11-08-11, 09:40 AM Thread Starter
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Oil spots on garage floor appears right under

1999 Lincoln Navigator. This morning I noticed a few small oil spots on garage floor directly below the passenger side bumper. Does anyone have an idea what may cause that? This is the only leak of any type this vehicle has had. No visible signs of damage. Due to combat injuries I can't remain on my back long to further investigate, an can't really afford to take in repair shop, any ideas of what it might be?

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post #2 of 16 (permalink) Old 11-08-11, 01:41 PM
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Re: Oil spots on garage floor appears right under

Does your car have an engine oil cooler / transmission cooler , could that be where the oil is coming from ? Dont know if this applies to your engine ,

FORD = Head gasket failure

Ford dealers are repairing or replacing engines due to problems arising from a 1999 model-year revision to the 5.4-liter engine's head gasket. In defective units, the head gasket fails to seal variances in the engine block's surface, permitting oil seepage
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post #3 of 16 (permalink) Old 11-08-11, 03:20 PM Thread Starter
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Re: Oil spots on garage floor appears right under

Yes it does, an it appears to be covered by a gravel guard, I believe the cooler is located next to the radiater. What would cause it to start leaking all of a sudden?
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post #4 of 16 (permalink) Old 11-08-11, 03:26 PM
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Re: Oil spots on garage floor appears right under

Check this , might help you .

http://www.thedieselstop.com/faq/949...les/000901.pdf
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post #5 of 16 (permalink) Old 11-09-11, 08:38 AM Thread Starter
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Re: Oil spots on garage floor appears right under

Does not appear to be leaking from that area. It does not get driven over rough roads or long distances could something else be causing the leak?

When the oil pump is about to fail, would there be oil leaking? Just started vehicle, oil light came on, an gauge dropped to no pressure, an there was a constant whinning noise, will oil pump/bearing make noise if pump is failed?
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post #6 of 16 (permalink) Old 11-10-11, 03:06 AM
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Re: Oil spots on garage floor appears right under

If oil level o.k , it could be a faulty oil pressure sensor / switch , could also be leaking oil .
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post #7 of 16 (permalink) Old 11-10-11, 11:14 AM Thread Starter
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Re: Oil spots on garage floor appears right under

The oil was down about 1/2 quart, but I knew that cause I was going to have oil changed this coming weekend. Do you know if it would be save to drive to garage as long as the valves were not "ticking" due to lack of oil circulation if the gauge/sensor is just bad? Engine did not over heat eaither
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post #8 of 16 (permalink) Old 11-10-11, 01:23 PM
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Re: Oil spots on garage floor appears right under

If oil is only down a pint , should be o.k . If its the switch / sensor thats leaking , usually only does it while engine running and under pressure . Could check if that is fault and how bad it leaks , but probably nothing major but better be safe rather than sorry .
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post #9 of 16 (permalink) Old 11-10-11, 01:51 PM Thread Starter
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Re: Oil spots on garage floor appears right under

I went out an started Navigator, an in about 30 seconds oil light went out an gauge started working again, then in a couple minutes they stopped again, this happened several times withing a 10 minute period. I have been trying to locate the position of the Oil sensor/sending unit, do you have any idea when it would be located? Thank youi
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post #10 of 16 (permalink) Old 11-10-11, 04:37 PM
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Re: Oil spots on garage floor appears right under

Here is an old link on similar fault which might help you ,


1999 Navigator 5.4L 32v oil sending unit
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