We just put a used engine on the Pickup

TRUNKBRANCHES

MEMBER
1993 FORD F-150

We just put a used engine on the pickup. It has run very rough since then. We've put a new fuel pump on and a used coil.

What it does is that it runs very rough and will buck. For several days, it will run like that. Then another day it will still buck, then die. And once it dies, it won't start till it sets for awhile.

7 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

First, it would help if we new what motor we are talking about

did you check the basics? Compression, fuel pressure and spark>>

did you tune it up before installing?

Roy

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Tuesday, January 1st, 2013 AT 3:22 AM

TRUNKBRANCHES

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4 POSTS

300 inline 6
Fuel pump changed new. I have no clue if the mechanic did compression check, fuel pressure. Would any of this be checked/done when the fuel pump was changed?

The engine is a used engine from a wrecking yard. Supposedly it ran well and was tested.

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Tuesday, January 1st, 2013 AT 3:26 AM

ASEMASTER6371

MECHANIC
52,797 POSTS

I never trust a junkyards word as they just want there money.

We need the exact pressure for fuel.

Check all the basics first before proceeding

roy

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Tuesday, January 1st, 2013 AT 3:31 AM

TRUNKBRANCHES

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4 POSTS

As a general rule, what could cause this type of thing? My father said that even though it fuel injected, he said he thinks it still has a form a carburetor. Dad suggest the soft plug on the bottom of the automatic choke could be gone.

Choking so the butterfly is closed?

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Tuesday, January 1st, 2013 AT 3:32 AM

TRUNKBRANCHES