2.8L to 4.0L need help!

[SquashMan2009]

Ok so I need a little help as im somewhat over my head and am pretty much now stuck. I have an 88 Ranger which had a 2.8L motor in it that someone swaped in. I have now put in a 4.0L out of a 96 explorer, I re-used my tranny i had since the explorer had a blown one and it was the auto tranny anyways. So basically i cannot get the motor to run and I dont know what else to do. I can crank it over and it will fire right away but then dies immediatly. If i stay on the gas it will struggle but keep going if i floor it. I can elaborate more on whats working and not but basically I ran all the essentials computer power and grounds are all hooked up all the sensors are contained in the harness which i pulled straight off the donor truck. I pulled the tank and sending unit out of the Explorer since my old setup was carburated and used that one. I also tryied running straight power to everything to see if it was the ignition switch but that doesnt work either. I dont know what else to look for any help is appreciated, My Evap control and O2 sensors are all I didnt hook up, i wasnt sure about the evap but i know O2 sensors only effect when its hot

 

[dangerranger83]

Look at your firing order and see if your plugs are in the wrong places.

 

[Original_Ranger84]

Well your first problem is that you have an OBDII engine and stuff with an OBDI truck and trans. the computer can't get the input it needs from everything else.

And it should have a coil pack not a dizzy

 

[dangerranger83]

I never said anything about a dizzy. You can have the wires on the coil pack going to the wrong plugs and vise versa.

 

[Original_Ranger84]

Yeah i thought about that afterwards... but i wouldn't have touched them in that case.

Well i still think its too new of a motor for everything else... A 94 motor would be a much better choice. Plus you have the A4LD and I believe they did away with that one in 94 or 95 so your computer is also reading a different tranny. So even if you get it running i wouldn't count on it driving or shifting right.

 

[SquashMan2009]

Ok im going to have a look at it this weekend, not running the A4LD, its the manual tranny, and yes i have the coil pack i took the whole system out of the explorer. I wasnt really thinking the Computer with Manual tranny was an issue, i can get a computer from a 96 with a manual tranny if they are different.

 

[Original_Ranger84]

Oh... i just assumed you had an auto tranny too cause you got it from an auto tranny truck. But yes it will make a difference the computer is set up to need the signal from the transmission weather it be auto or manual, but you need a manual computer for a manual trans especially in the newer ones. I am gonna say you are going to need a newer tranny too from a 96+ vehicle with the 4.0 as they probably have sensors in them. pluse I assume you have a Mitsubishi FM146 or 145 which isn't the strongest transmission a TK4 or 5 is really pushing it but you would be better off with the M5OD.

 

[lifted92ranger]

So can you use the TK4-5 or the M5OD on a 92 4.0 OHV? I currently have the FM146 (from a 2.9L) the o'll A4LD didn't hold up.

 

[BlackBII]

Well, if it at least fires we know youre getting spark and compression. So that leaves air and fuel.

What the fuel pressure at? Is the IAC working? Did you swap out all the fuel lines?

 

[Original_Ranger84]

Well i hear they are direct bolt in transmissions as the 2.8L, 2.9L and 4.0L come from the same family. But I hear the FM146 are the weakest trans put in them. and the TK 5 is the next but is better off. Then they just switched to the M5OD which can take it.

 

[lifted92ranger]

what year did they start making the M5OD?

 

[SquashMan2009]

Ok so for everyone yes its the TK5 and I realized that I should be running the mazda but I could only find auto trannys. As for bolting up and everything its fine didnt have any problems there fit right in. So i ran a new line steel line for the main line, and a new filter, so fuel should not be an issue but i will check pressure, dont think its an issue though. I dont have any way to scan my computer is there anyway to check for codes besides that, like can I measure voltage across an output or something? Firing order is fine. As for the computer needing a signal can I just run an input to it off like the ignigtion coil or something I can rig up? Dont really understand why it needs an input from the tranny to run, seems to me at the moment its a fuel or air issue since its firing nice, but I cant see any of my sensors not hooked up.

 

[swamprat]

I have a 93 4.0 in my 89 BII with the M5OD. I am using the auto computer that was on the 93 Explorer. No problems. Just jumped the clutch wires.

 

[SquashMan2009]

Ok I wanted to post and update things are going slow here as im a student but now and then I get some done. I still cannot get it running, As for the Posts the firing order is correct, I checked fuel pressure its 40psi and 30 at idle. I was able to get the truck running by just spraying quick start in the air intake and she fired up nice and would run if we keep applying it. Expected fuel pressure to be an issue but it seems ok. As for sensors and everything this came out of a working truck and the harness was left intact on the motor and dropped in. Any more thoughts or suggestions would be appreciated.