oil pump going bad?
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Junior User
Joined: Apr 2002
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oil pump going bad?
Lately when I start my 89'f-150 4.9l truck with 154,000 miles on it I've noticed it sounds kinda of rough and sluggish after it fires up.
The concern is that the oil pressure guage does not show any pressure for about 5 seconds and then when the guage needle moves to a normal oil pressure reading the motor seems to smooth out,but still has an intermittent shake or shimmy when you watch the motor. It does this when it sits for a few hours. When I turn it on after sitting for a few minutes the oil pressure reads normal right away.
Could this be a sign of oil pump failure ? Or something more serious like the crankshaft bearings?
I use motorcraft 10w-40 and motorcraft FL1A filters.3000-4000 intervals.
Did FTE change the search feature on the web site. It does not seem to do a good search like it used to?
thanks Jim
The concern is that the oil pressure guage does not show any pressure for about 5 seconds and then when the guage needle moves to a normal oil pressure reading the motor seems to smooth out,but still has an intermittent shake or shimmy when you watch the motor. It does this when it sits for a few hours. When I turn it on after sitting for a few minutes the oil pressure reads normal right away.
Could this be a sign of oil pump failure ? Or something more serious like the crankshaft bearings?
I use motorcraft 10w-40 and motorcraft FL1A filters.3000-4000 intervals.
Did FTE change the search feature on the web site. It does not seem to do a good search like it used to?
thanks Jim
Elder User
Joined: Jan 2002
Posts: 555
Likes: 0
oil pump going bad?
Jim,
I may be wrong on my diagnosis but I;m not convinced that you have an oil pump problem yet. To me it may be just a sending unit. If you want to know for sure hook up a manual gauge where the sending unit goes and see what happens.
If your pressure was that low I would think that you should hear some valvetrain noise and not feel a shake or shimmy.
I may be wrong on my diagnosis but I;m not convinced that you have an oil pump problem yet. To me it may be just a sending unit. If you want to know for sure hook up a manual gauge where the sending unit goes and see what happens.
If your pressure was that low I would think that you should hear some valvetrain noise and not feel a shake or shimmy.
oil pump going bad?
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