5.0 efi problem

thank you
Jim S.

 

from the reading I've been doing I'm starting to question fuel delivery. I installed a in tank YJ pump and checked the pressure at idle 32lbs, and at WOT 30+lbs but havn't checked it under load......I think I need to rig up the gauge so I can read it while under driving conditions, seems bad pressure or volume could be the culprit as well?
Jim S.

 

yea that's what I remember hence the need to recheck the pressure....I'll have the gauge tomorrow so I'll know then.
I have talked to the guy who made the harness......he'll replace the one I have with the above mentioned items, but I want to check out a few other things first
Thanks for the input....Jim S.

 

checked the fuel pressure with my mechanic at work.....32lbs at idle.....42-43lbs at WOT well within reason for my stock HO.
Also checked the vacuum pressure....again good readings.
Took my guy on a long drive so he could see for himself the issues....he's convinced the TPS is bad and suggested new wires and plugs as well.....I didn't replace them when I swapped motors ......I'm gonna try these recommendations before I throw in the towel, my guy hasn't let me down before....I told him his rep was on the line R)
I'll update after the parts are installed.....Jim S.

 

Donor ran great before pulling the motor
I never messed w/ the injectors.....I'm running a in tank YJ pump.....I will call him
Pm me your ph# bro
Jim S.

 

Yep I've spent ALOT of time on that site
Jim S.

 

put the new TPS on, new plugs and wires.....drove into town 4 or 5 miles at 50-60mph and it seemed to be doing great......through side streets still great. Came to a stop at the gas station and it idled very erratically. Left the station and it was back to missing badly like before in all gears and all rpm's. Parked in the garage and after a minute or so it smoothed out at about 800rpm's.
One thing I noticed is it ran ALOT cooler than before....205-210 before......175-185 now
As has been stated I think at this point it seems to point to the lacking VSS hook up.......AAARRRRGGGHHHHHH!!!!!!!!!!
Jim S.

 

Napa says not but.............
Jim S.

 

no....wouldn't the pressure suffer if that were the case?
Jim S.

 

so let me update.........I towed the 6 down to San Diego a week ago to get a axle upgrade, while there I was given the name of a guy/shop who knew the 5.0 well. I dropped the jeep off there for him to look at. He found several issues.....timimg off a bit, idle stop needed adjustment, idle air needed adjustment, one inj. coil bad, 2-3 inj partly plugged..........after all this it ran better but still idled badly , . The mechanic has been good through this as I've wanted to stay on top of expense. His determination is that the harness has a issue somewhere that is causing a "hole" in the computer inj. signal.


I thought long and hard about a solution......the cost to have a new speed density harness built would be substantial (don't trust another old modded harness) and the mass air system is a huge upgrade over SD system I have sooooooooooooooo I authorized the shop to upgrade/change the componets to MA. So in the end I'll have new inj's, new harness, new MA meter etc......
guess the Holly projection on the old motor wouldn't have been so expensive after all R)
Jim S.

 

Sorry.