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3.9 to 5.2 swap compatibility question

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Old Aug 9, 2009 | 06:25 PM
  #11  
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No they didn't come in that year, nor did they come with a 5.2 either, but is that what I need is the 99' dakota MT ecu? I was reading earlier in the thread and huseman was saying that if you don't have your exact year dakota then you're gonna have little problems here and there...? I need to know exactly what ecuI need.
 
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Old Aug 9, 2009 | 10:29 PM
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Originally Posted by dakotaman123
No they didn't come in that year, nor did they come with a 5.2 either, but is that what I need is the 99' dakota MT ecu? I was reading earlier in the thread and huseman was saying that if you don't have your exact year dakota then you're gonna have little problems here and there...? I need to know exactly what ecuI need.
Nope dont use a 99. I had the same problem with my 2000 as their is no 5.2 for this year. Im using a PCM from a 5.9 in mine and it worksperfectly.

Youll want to get a PCM from a 2001 Dak with the 5 spd and the 5.9 engine.
 
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Old Aug 9, 2009 | 11:29 PM
  #13  
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Default that brings up another question

Thank you for the response, so you're saying if i throw in the 5.9 mt ecu then it will cure all my problems in the cab? like the a/c and the gauges? and if so then on top of that, wouldn't using the 5.9 ecu tell the injectors to pump more fuel making the mpg worse? sorry for all the questions, just my first truck and it happened to have this confusion right off the bat that I know nothing about yet.
 
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Old Aug 10, 2009 | 12:24 AM
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Originally Posted by dakotaman123
Thank you for the response, so you're saying if i throw in the 5.9 mt ecu then it will cure all my problems in the cab? like the a/c and the gauges? and if so then on top of that, wouldn't using the 5.9 ecu tell the injectors to pump more fuel making the mpg worse? sorry for all the questions, just my first truck and it happened to have this confusion right off the bat that I know nothing about yet.
between the O2 sensors, the TPS, the MAP, and all those other sensors....it shouldnt know the difference. 5.2 and 5.9 I THINK used same injectors.
 
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Old Aug 10, 2009 | 03:56 PM
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Default ok, next problem

Like I figured and of course this couldn't be just a simple computer problem... They did not make a manual dakota in 2001 so I am only able to order a 5.9 AT ecu for a 2001, now what?
 
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Old Aug 10, 2009 | 05:21 PM
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Originally Posted by dakotaman123
Like I figured and of course this couldn't be just a simple computer problem... They did not make a manual dakota in 2001 so I am only able to order a 5.9 AT ecu for a 2001, now what?
it will be looking fo data from the non-existant AT....

edit- car-part.com doesn't show the 5.9 ever having an MT?? 99 is the newest ECU i see at all that has any big-bore V8 with a manual...
 

Last edited by magnethead; Aug 10, 2009 at 05:23 PM.
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Old Aug 11, 2009 | 05:33 PM
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hmm.. that makes things a lil more difficult. one from an 01 5.9 auto will work if u can live with your CEL being on all the time.

If u did that and had a decent wiring diagram of the pcm pinouts... you could figure out what voltage each wire that goes to an auto tranny is and than put a wire and a resistor on it with that voltage. In theory that should turn the CEL off but thats way beyond what i could help u with.

I would say go ahead and try the auto one and see what u get.

Good luck
 
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Old Aug 11, 2009 | 05:37 PM
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What does the Auto one look for from the Trans? Neutral, reverse, temperature, pressure, what else?
 
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Old Aug 11, 2009 | 09:15 PM
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Originally Posted by magnethead
What does the Auto one look for from the Trans? Neutral, reverse, temperature, pressure, what else?
Plus overdrive, otherwise you nailed it.
 
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Old Aug 11, 2009 | 09:31 PM
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So you'd have to fab some sort of adapter to connect the Neutral and reverse sensors from the MT to the ECU, temperature might be same?, pressure and O/D might be able to be dummied?
 
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