my mistake i tested the vacuum in the crankcase to see if the plenum gasket was blown if there had been any vacuum the gasket would be malfunctioning there was none my bad i thought you would know what i was talking about.
Cylinder 5 was 120 on the compression test, injectors on all cylinders are fine spark is fine on all plugs new cap and router new iac,itc,map,o2 up and down stream, no vacuum leaks checked whole vacuum system with propane and i checked the pressure on the fuel rail i feel like im banging my head against the wall working on this truck really i need to figure out how to match a 5.9 pcm to my truck vin because the part number on the 5.2 pcm is the wrong one im trying not to buy one and have it reflashed to my vin im hoping i can find a plug and play 5.9l pcm that matches everything in my truck its looking like its not gonna happen

 

It's going to have to at least be flashed with the VIN, else various things won't work.

I would be tempted to take it to the dealer, and have them flash it for the 5.9. Just make SURE they flash it for the engine that's in it, and not the vin code......

 

so what would happen if i get it flashed for the vin code and the engine was replaced just curious because i have absolutely no clue if the engine was replaced since i bought the truck used i just want everything in the truck operating at 100% and the only dodge dealership is 100 miles in each direction from where i live??? I usually have to order off the web but if thats the best way it will be done there has to be a way to decode the door jam label for a parts reference???

 

I have a hard time believing a dealer will flash any other program other than VIN matching. Last I remember they have to submit the VIN to corporate and corporate sends the appropriate program to flash. It is all done by VIN.

I have an even harder time believing someone replaced a 5.2L engine with a 5.9L engine and vice versa. These things are a nightmare to replace the engine, 99% of them end up scrapped when the engine dies.

Get it VIN flashed and hope for the best.

 

I have a 2001 Dakota I just bought didnt realize that it had a motor swap it was a 4.7 and it has a 5.9 in it ran but not right and wudnt shift out of 1st gear not sure what they did the wiring harness looks right I'm not sure what pcm is in it and dont know how to check and the trans looks like a 5.9 from pics iv seen online could I get some help with this mess

 

That is a cluster frak. There are some many differences between the two engines/transmissions/electrical systems, that I think you are going to have a fun time getting it to run right. Since you really don't know what the previous owner did, think I would take it someplace, and see if they can tell you what engine the PCM is programmed for, see if the trans has the correct 8 pin connector, etc.

I know they came from the factory with the 46RE, and 5.9, might be further ahead getting PCM, and wiring harnesses from a donor, but, even going that far may not fix it.

 

Oh, you have a hard time believing? Ok. I have a 99 Durango SLT that came with a 5.2l on a 44Re. I regularly drive around in the same chassis, but it has a 2000 5.9l on a 46Re.
The only difference between the engines was a lump of iron on the block next to the starter, I die grinded the lump and bolted the 5.2 starter to the 5.9 block. I even ran the 44Re on the 5.9l for a year before I got a 46Re.

I did the swap outside, with a forklift to get the engine out, and it is the only time I ever replaced an engine. The only "nightmare" about it was the t-case bolts next to the body.

One of the absolute worst parts of auto work is the arrogant, egotistical, useless comments that fill the forums with needless, dogmatic, and fundamentally mistaken information.

Yes, you can swap a 5.2l and a 5.9l engine. Even the tyranny mismatch is fine. They use the same castings for the block, and everything that isn't piston or crank related is the exact same part, even my Hughes air gap manifold (because plenum plates are a stupid idea).

Your comment added NOTHING to the discussion about the 5.2 vs 5.9 PCM, and it annoyed me so much I actually joined just to reply to the inane nonsense.

 

So you come here and register, and your first post is THIS??? Really? And please tell me, given the tone of your post, the slinging of insults, etc, do you still think you are going to get your message across? Or are folks going to look at this post, see only the negatives, and ignore the message you attempted to get across?

I am tempted to just blow this post away, and ban you.

 

The message is the negatives - egotistical ignorance in direct opposition to real-world application, offering nothing to help?

That's the measure of your moderation then? "Blow" it away and ban me - can't handle a challenge to an inflated ego.

Cowardly despot. Enjoy your fiefdom.

 

I will, thank you very much. Good bye.