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Old 06-25-2006, 12:17   #1 (permalink)
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Oil in intake 5.0 Bronco

Hello to all, new to forum and seeking help. Hope this does not end up a double post as have tried once already.

Here's the problem. 1991 5.0 w/125k original miles, has never used oil in past. Recently when I checked the oil after replacing the timing chain cover gasket and water pump it was 2 qts. low. No leaks. Checked intake breather and found oil in breather and filter to breather line was saturated with oil. Oil used is Mobil 1.

Have checked so far: No vacuum leaks found; Vacuum is 19 and steady;compression is, #1-200, #2=210, #3=200, #4=200, #5=190, #6=190, #7=205, #8=210; Cleaned upper intake and all PCV ports (no obstructions); Replaced PCV and hose; Cleaned valve covers and checked oil return holes; All spark plugs are clean with no evidence of oil fouling; Engine has had loss of power up a hill so I checked the CAT using vacuum at idle VS vacuum at 2000 RPM--it increased and was stable; Mileage had dropped from 18 hwy to a little over 12, increased now to about 15-16 overal; Idle RPM is high @ 900 but eventually drops to about 700; Disconnected oil breather line to breather, installed new filter, and filter became discolored after being driven once and oil fumes were noticeable in cab; No visible oil smoke under hood even with oil filler cap removed; Also, no noticeable pressure at oil filler cap even with RPM accelerated; Used 1/2 quart in less than 200 miles this past week.

Next step is to do a leak down check but am having difficulty thinking there is a problem in that area. If anyone can offer me some guidance as to possible causes I would greatly appreciate it. I hope I have provided enough information so someone can point me in the right direction or make sure I am on the right track to solve this problem. HELP and thanks a MIL. Nonyab
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Old 06-25-2006, 13:38   #2 (permalink)
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Re: Oil in intake 5.0 Bronco

yo
Read this discussion about the PCV line, etc.

http://fullsizebronco.com/forum/showthread.php?t=16026

Also, since you're pretty d good with tools, look at this:
PCV Valve Vacuum Supply Hose Rerouting for 87-93 5.0 by Ryan M
http://fordfuelinjection.com/files/Reroute_PVC.pdf

more here fyi, but Ryan does nice work!
PCV Valve Vacuum Supply Hose Rerouting for 87-93 5.0 by fourstarengines.com
http://www.fourstarengines.com/techtips3.htm

lemme know how it goes!
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Old 06-26-2006, 15:23   #3 (permalink)
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Re: Oil in intake 5.0 Bronco

Thanks for the info, will reposition PCV hose fitting as soon as I do the leak down check. Question---would you know what cylinders are at TDC, 90, 180 and 270 degrees on the 5.0? Did have the info but lost it. Thanks for your help.
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Old 06-27-2006, 05:30   #4 (permalink)
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Re: Oil in intake 5.0 Bronco

yw
don't have that info right now; did use a camshaft degree wheel a few times a long time ago but forget the dteails; ask this Q at that other site; they know!
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