Have a 1990 F150 351 Cleveland
03-04-2008, 08:03 AM
#1
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Have a 1990 F150 351 Cleveland
Have oil blowing into my air breather. From the valve cover. Have a brand new PCV Valve. Been told I might have a bad ring in one of my cylinders. With 209,000 miles on engine could that be the problem. Runs good but I am losing power and have gone from 14 MPG to 8 MPG recently. I've tuned it up; plugs, oil filters.... didn't get any better. So I replaced my EGR Valve, the Ideler Sensor, the oxygen sensor on the exhaust. If you have any ideas or suggestions I would sure like to hear em. Thanks
03-04-2008, 08:35 AM
#2
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351 Cleveland??? Ummm no.. 351 Windsor maybe. Unless someone has done some major changes. Do a compression test. The cylinders should be within 15 percent of each other.