Ok guys..
93 dak, extended cab, 4x4 LE 5.2 auto.
Recently put in a re-built 5.2, as the original was locked up when I bought it.
I've posted for a few things, thank you all for the help!
It's up and running, and all seems well, except for a few worrisome issues..
1.
Doesn't like to idle too well, until it gets warmed up. If I start it and just let it sit till at operating temp it's perfect. However, if I attempt to drive, and or touch the gas at all (before warmed up) it will stall out easily.

2.
There is a BIG vibration when it kicks into overdrive.. It's not present in any other gear. It has brand new tires, and the U-joints look ok, but I was going to change them anyway. However, I'm thinking it's something else entirely.

3.
Seems to be a little low on power.. going up hills is not very confidence inspiring. Granted, I'm babying it since there are less than 50 miles on the engine, but... seems not right!


I have tried searching here, but the search always deletes "common words" so more often then not, I'm only searching one word!!
I have found as few possibilities though.. could it be a fuel issue? Bad injector, or possibly not enough fuel pressure? I had on my list to replace the fuel pump anyway..
I switched over the plenum from the old engine (the rebuilt came with one, but it was off a 96 Grand cherokee and a little different). I did not do the plate thing from hughes... kind of regretting that, but I was low on cash at that point.
Any thoughts?? I know this is a long post, sorry!

 

Are the injectors correct? If you put in a v8 engine with v6 injectors, you'll have a problem. Same goes for PCM

 

Yes, its was a 5.2 truck to start with...

 

Did you try resetting the PCM?

 

It has been reset.. The battery has been unhooked several times.

 

Definately sounds like fuel then. When did you last change the fuel filter? I don't know much about how to check for fuel pressure.

 

Well, I was thinking the filter was in the tank, but come to find out it isn't.. So,
I threw a new one there today. I think I got a pretty good indication that the fuel pump needs replacing. I pulled the fuel pump relay, and tried to start the truck.. nothing! There should have been at least a little fuel pressure I would think.
So, not sure if it's even related to the vibration in overdrive, but I think that definitely indicates the pump needs to go..

 

depending on your set up...
if you don't have a mechanics hoist to put it up on the air, I took my box off and worked on it from there. It only had 8 bolts that I used a breaker bar on and it came off with my brothers help.
Then I worked on the pump from there.

 

Unrelated question, the transfer case.. does it share fluid with the transmission, or are they separate? I am draining the fluid for both, but didn't see anywhere to refill the transfer case...

 

Well,
I have a new fuel pump.. no noticeable difference (other than my fuel gauge works now). I feel ok changing the pump, just for peace of mind.. I think it was replaced at some point, but no way to know till I pulled it out.
Anyway!
Still have the vibration.. I pulled both driveshafts, got new u-joints in the rear. Left the front shaft out for now, and took it for a drive.. I still have the vibration when overdrive kicks in. Should I be leaning toward a fuel problem? Injector maybe? (It does have a bit of a rich exhaust smell)
What else? Transmission mount?
I really don't think it a motor mount.. it seems to happen in the 45-50 mph in overdrive only.