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Discussion Starter · #21 ·
Good to see you are still in good humor about this!
Do you have one of these or know where you can borrow one? It won’t help you fix much of anything, but it could help you confirm/deny if those injectors are getting a signal from the PCM.
Yeah i should probably go get another noid light. Mine has disappeared, but heres another thing i did. I put a voltage meter on all of the wires to the injectors. Every single one is measuring all the same at 13.7 volts or something like that. I know for sure they were all measuring the exact same which is the weirdest thing because while its running or idling i assumed that i would see a sudden drop in voltage for the open and close function on the injector...... Which led me to believe it was a continuous spray from the injectors but if that were true then why the hell am i not getting fuel to those cylinders? lol I havent tested fuel pressure yet but i feel like that isnt an issue. It starts right up no issue every single time but just doesnt get fuel to 4 and 6 for some reason even though the injectors are supposedly firing. I wonder if there is a stuck valve or something but that would also be hard to believe. Really the only thing i can think of is the 5.9l PCM i got for the 5.2l just has a bad tune or something. Maybe the injector timing for 4 and 6 is off? but even then i feel like i would see or smell fuel on the spark plugs. I need to find a diagram for all of it. Its to the point where i might just post a video up and see if someone can diag it from that or give me their opinions as well. I recently moved to Foristell, Mo from Clearwater, FL so sadly i havent met any car guy or tech connections yet lol
 

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1988 Dodge Dakota LWB RC 3.9V6 3 speed auto
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The injectors will have 12V the entire time the motor is running.

The ECU GROUNDS to complete the circuit, so you'll see that popping !IF! - that is, IF or ONLY IF - your meter is fast enough.

Consider that you're looking at a few millisecond pulse - at 600 RPM, that's 300 pulses per minute, or 5 pulses per second, per cylinder - you won't see it on a digital multimeter, and probably won't see it on an analog.

RwP
 

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C'mon Dodge - NEW DAKOTA
2003 Dakota Club Cab Sport 4.7L
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Still got the old injectors? Might try putting those back in.
 

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Discussion Starter · #24 ·
Alright here is another update. Now dont skewer me for this but it was the easiest way to figure it out at the time. I cross bridged the connection from the #2 injector to #4 and #6 injectors....... Aaaaaaaaand its now running on all 8..... SO what ive figured out is either the pcm is not timing or sending signal to the 4 and 6 injectors OR my crankshaft position sensor is not the right one. I started with using the original sensor from the V6 because it cleared the new manual flywheel and the automatic sensor did not. I changed that to a sensor for a 5.9l manual and there was no change but the clearance was the same. So autozone had the option for a crank sensor for a 5.2l manual.... which i ordered a couple hours ago and will be here by 9am. That being said though, its a sensor to match the 1997 5.2l with the manual flywheel. Either that is going to fix it, which i kind of doubt, or i gotta get a tuner on this thing and see if the PCM is communicating with those injectors.... All in all an eventful day and i also put on the roll pan for the rear. Also detailed the interior a bit because its been sitting for atleast 4 years out in the sun..... Just look how good everything is though, its very surprising! Also the trans temp light is no longer on the dash.....
111144
The best news is when i bridged those connections that motor sounded nearly perfect firing on all 8 cylinders but im sure its not good for it. I wonder if anyone knows of an external fuel injector controller? That would be pretty sweet.
 

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1988 Dodge Dakota LWB RC 3.9V6 3 speed auto
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Well, if it's anything - did you use a V8 or a V6 flywheel?

If it's the V6 flywheel, well, There's Your Problem. It's getting six cylinders worth of pulses, so not firing properly.

(And what you've done isn't working RIGHT, just KINDA SORTA.)

RwP
 

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Discussion Starter · #26 ·
Well, if it's anything - did you use a V8 or a V6 flywheel?

If it's the V6 flywheel, well, There's Your Problem. It's getting six cylinders worth of pulses, so not firing properly.

(And what you've done isn't working RIGHT, just KINDA SORTA.)

RwP
Oh i agree, its definitely not right but its kinda working lol It just helped me narrow down where my issue is. But no the flywheel is specifically for a 5.2l v8 manual. Ill have more info later today when that sensor comes in and i slap it on.
 

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Discussion Starter · #27 ·
Hey guys, ive been really busy with other projects and i havent touched the dakota in a while. So now im thinking about getting back into it, but im going to need more advice for sure. I have been going over all of the stuff i did to swap the 5.2l in but im still kind of at a loss as to why number 6 and 4 cylinders are not getting injector pulse. Im positive i used a brand new 1997 5.2l flywheel from autozone for the swap so i really dont think thats the cause for the no pulse but im not completely opposed to the possibility. I would have to drop the trans to check and get a part number because i dont have the doc's from the flywheel purchase. I really think the problem is within the PCM but i just dont have a way to diag it. The PCM i ordered was for a 2001 Dakota r/t 5.9l which i was told would work perfectly but i ordered it through a company off Ebay that was highly rated. So i need some ideas fellas, it cranks and starts perfectly fine without issue other than injector 4 and 6 not firing. Injectors were tested and working but to be completely sure i also replaced them with new injectors. The swap was really smooth and the entire build looks factory so this is pretty annoying lol
 

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I did this on my son’s 2000 that have a V6. We used a 5.2L and PCM from a Durango.
A question for you: did your truck have a security system? Did it have powered doors and locks? These questions will help me with the next statement I will make. There is an orange and green wire on the CTM that you need to ground(what most manufactures call a body control module). The CTM is behind the glove box. You might need to do more than just ground the wire. Based on your answers, I can help you the rest of the way. My son’s truck took a couple more modifications, but it worked.
I did this exact same swap but in my automatic 2003 v6 3.9 dakota and used the engine from a 2000 durango slt. Same problem. No bus showing on gauge cluster and also don't want to start with the v8 durango ecu. Getting it to run with the original ecu from the v6 just down 2 cylinders. Any help as to what ecu to order/ part numbers or what I can do to get my truck sorted would be appreciated. Thanks in advance
 

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Well guys this is my first post on a forum ever about one of my builds. My latest build is this 2001 Dakota 3.9l 5spd manual. I was working in a salvage yard at the time and had 3 donor trucks to choose from. I bought this one for 300 dollars because of its immaculate condition given how long its sat. First thing i wanted to do was obviously put a v8 in it! I had assumed that the swap would be fairly simple since the trucks were so identical but later on in the build i discovered how different they really are. The main donor truck that i used for the motor was a 97 5.2l extended cab automatic. The others were also 5.2l but the motors were in questionable condition. The motor i decided to go with was the one that i could get running. So far the truck has been completed but ive run into one problem that has halted the build for a couple of months due to not having the time to work on it until now. I am currently stuck with a PCM issue. The original PCM is for a 3.9l 5spd 2001 model and the PCM i planned on using was from the 97 5.2l automatic. When using the 5.2l pcm the truck fires up no problem but dies immediately. Originally i thought it was a skim issue but this truck is not equipped with one. I decided to get it flashed and programmed for my 2001 but it still does the same thing. it took me a while to notice that there is a No Bus code so thats when i figured that the 97 pcm is just not going to work. So now im stuck because the 5.2l was not produced in 2001 and up on dakotas. I read somewhere that someone used a 2001 5.9l pcm to correct this but finding one at a decent price has been an issue so now im trying to research all of my options before putting down more money on a pcm than what i paid for on the truck lol Im sure someone out there has done this exact swap before and this PCM issue is the only thing that is stopping me! Btw with the v6 pcm on it will run but not on all 8, but with the v8 pcm from the 97 it fires up perfectly but dies immediately. Anyone have any wisdom of experience for me? This issue is the only thing i have left to finish on this truck! I would love to make a post of the entire build with plenty of pictures and info when im done but i dont want to post anything until i can resolve this issue! Help me out Dakota Gods!
I don’t know if you figure it out yet but, but when you go from a v6 to a v 8 engine you always have to install the PCM and the cluster from the truck you took the engine from that way you don’t get the bus code. Next the turning on and turning off problem I think is your crank sensor maybe when you install the engine you probably bump to it cause I done that before and it was doing the same thing your talking about and that fix my problem after I switch it
 
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