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Basic Questions Issues - need ideas

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Old Nov 25, 2009 | 11:04 PM
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Basic Questions Issues - need ideas

This is my 4th OBS ford. Just picked up a 94 f-150 ext cab shrt box 5.0 auto. I'm having a shuddering issue only when decelerating form around 35-40 MPH. If I give it gas it will go away. Wondering if it's a bad Torque converter? U-joints seem fine.

Also my oil pressure gauge is strange, Not sure if it's accurate. But it goes from the "N" on "normal" and then goes lower then up then sometimes it's below "N" and some times it's "N-O" range... bad sensor or do you think possible low oil pressure?

Also, when i cold start it seem to have a horrible knock, if I put a load on it the knock goes away, when i let off u can hear it. When it warms up it doesn't do it. Piston slap?

Thanks for the help. I'm debating if I want to build this truck or sell it to find a better shape starting point!! (Southern truck)!!
 
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Old Nov 26, 2009 | 06:12 AM
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From: Easton,Ks
Originally Posted by ech0sh4y
I'm having a shuddering issue only when decelerating form around 35-40 MPH. If I give it gas it will go away. Wondering if it's a bad Torque converter? U-joints seem fine.
More likely an loose pinon nut on the rear end.

Originally Posted by ech0sh4y
Also my oil pressure gauge is strange, Not sure if it's accurate. But it goes from the "N" on "normal" and then goes lower then up then sometimes it's below "N" and some times it's "N-O" range... bad sensor or do you think possible low oil pressure?
The oil pressure sender is an off and on switch. So if you have any gauge reading at all it is not the oil pressure. Maybe a ground or voltage problem at the cluster.

Originally Posted by ech0sh4y
Also, when i cold start it seem to have a horrible knock, if I put a load on it the knock goes away, when i let off u can hear it. When it warms up it doesn't do it. Piston slap?
No it would not be Piston slap. Piston slap you will hear when the engine is cold under load. Maybe main bearings or rods.

Originally Posted by ech0sh4y
Thanks for the help. I'm debating if I want to build this truck or sell it to find a better shape starting point!! (Southern truck)!!
That depends on the body and not the Powertrain. The Powertrain is an easy fix, the body is the hard fix.


Powertrain: The elements of a vehicle by which motive power is generated and transmitted to the driven axles.
 
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Old Nov 28, 2009 | 12:11 AM
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ok thanks for the input! I'll have to check into it all i guess =\
 
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Old Jan 8, 2010 | 10:51 PM
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Any one else have any input on the situation?
 
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