5.0 running rough
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5.0 running rough
Am looking for some ideas I have an 88 F150 with 90K miles. It has the following problems.
1) Oil blow by into the air filter box'
2) Runs really rough and I just tuned it up. The plugs I pulled out where in good shape no signs of fouling at all.
3) After I drive the truck and come to an a stop the oil pressures goes really low unless I keep it reved up.
4) I guess my next step is a compression check to see if its the whole engine or just the heads. Could I still have good compression and just be the valve?
Any thoughts would be appreciated.
Thanks
1) Oil blow by into the air filter box'
2) Runs really rough and I just tuned it up. The plugs I pulled out where in good shape no signs of fouling at all.
3) After I drive the truck and come to an a stop the oil pressures goes really low unless I keep it reved up.
4) I guess my next step is a compression check to see if its the whole engine or just the heads. Could I still have good compression and just be the valve?
Any thoughts would be appreciated.
Thanks
Posting Guru
Joined: Sep 2000
Posts: 1,586
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From: Linwood, N.J. USA!
5.0 running rough
Sounds like it could be a ring problem. Oil in the air box is normally a sure sign. I would check the PVC system for proper vacuum and no blockage. A gummed up air box could restrict airflow to the engine. I have seen engines have bad blowby and still run pretty good. Good luck.
jakegypsum // Ford fleet, soup to nuts.
jakegypsum // Ford fleet, soup to nuts.
Elder User
Joined: May 2001
Posts: 662
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From: washington
5.0 running rough
It sounds like a combination of things to me!
The definate problem as far as oil pressure goes is your mains. All bearings including the cam bearings are responsible for oil pressure. I had the same problem with my 88 5.0 and I failed to replace the cam bearings along with the mains. The oil pressure went up to about 17 (Which was considerable, considering when it was at idle I had 2 lbs of pressure) but not as high as I had hoped.
Good news is, it is a cheap fix. Bad news is, it takes some time to do!
1988 Ford F250 4x4, 5.0 liter (soon to be Roller 5.0), AOD tranny, 2.5 Dual exhaust, Headman Shortyheaders, 33" BFG's Mud Terrain
1980 Ford F100, with 1988 5.0L Roller (carburated), T-5 five speed Borg Warner World Class Transmission, 31 spline 9" 3.73 posi , and a bunch more!! 13.78 quarter mile.
The definate problem as far as oil pressure goes is your mains. All bearings including the cam bearings are responsible for oil pressure. I had the same problem with my 88 5.0 and I failed to replace the cam bearings along with the mains. The oil pressure went up to about 17 (Which was considerable, considering when it was at idle I had 2 lbs of pressure) but not as high as I had hoped.
Good news is, it is a cheap fix. Bad news is, it takes some time to do!
1988 Ford F250 4x4, 5.0 liter (soon to be Roller 5.0), AOD tranny, 2.5 Dual exhaust, Headman Shortyheaders, 33" BFG's Mud Terrain
1980 Ford F100, with 1988 5.0L Roller (carburated), T-5 five speed Borg Warner World Class Transmission, 31 spline 9" 3.73 posi , and a bunch more!! 13.78 quarter mile.
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