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M90 rebuild (rudy)

Discussion in 'Need for Speed!' started by jd4242, March 30, 2013.

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    1. vroomzoomboom

      vroomzoomboom Elite Canuck STOCK SUCKS! Elite Explorer

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      when don said short, this made me think of something. is it possible you might have pinched a few wires, or melted some wires on the exhaust? there was a problem in some ranger years before you (i had a 91 that this happen to) that the harness was too close to the drivers side harness if i remember correctly that melted a couple of wires, and shorted out the computer. when that one happen it shorted the fuel pump wires and the pump wouldn't turn on. completely different problem that your having, but it might be something to look at.
       
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    3. 4pointslow

      4pointslow Explorer Torture Tester Elite Explorer

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      You will get this figured out and straightened out, just hang in there.
       
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    4. jd4242

      jd4242 Elite Explorer

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      Anyone know how to test the MAF??its a 90mm from a lightning if that matters..its getting power but what should the other wires test??

      I didnt have issues till i changed the tps,air filter and cleaned my maf..just want to eliminate it before i crack open the new ecm to put my chip in it..once i do that i cant return it..its sealed with tape and will be here monday
       
      Last edited: November 11, 2017
    5. jd4242

      jd4242 Elite Explorer

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      PS....
      ITS MY BIRTHDAY! !!!
       
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    6. CDW6212R

      CDW6212R Hauls the mail. Elite Explorer

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      Happy Birthday!! I hope you had a great one, and maybe some good football.
       
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    7. Centaurus5.0

      Centaurus5.0 Elite 5.0L Fiddler

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      You just earned yourself a Thumbs Up and a Cheers mister!
      :chug:
       
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    8. 4pointslow

      4pointslow Explorer Torture Tester Elite Explorer

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      Do you have another MAF to try out? (might be cheaper than a pcm?)
      Check the maf and make sure nothing is stuck to the sensing wires.
      Is the maf a six wire or 4 wire?

      What did you change about the tps, can you swap it back to the old one?

      What are the actual symptoms you are having now? (is there a communication problem with the PCM?)
       
    9. jd4242

      jd4242 Elite Explorer

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      I dont have an extra one,pretty sure its 6 wire but not using some..

      I threw away the old tps..

      Im getting high idle but at idle the AF is dead on..any press of gas results in extreme rich..no matter what we adjusted it would do the same thing except AF at idle,that would show changes...

      One of the 50 times we tried to adjust it,it start and idle fine..only then did the changes to the tune work at other than idle..we were lean across board so we pulled chip to add fuel, put it back in and started it..the idle then was high and was back to doing same thing...

      Whenever the idle is high it wont tune,something is shorting out and causing the high idle and extreme rich and cant be controlled other than at idle....
       
      Last edited: November 12, 2017
    10. boominXplorer

      boominXplorer Elite Ranger Elite Explorer

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      I've got a few regular 5.4 80mm mafs you could try
       
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    11. jd4242

      jd4242 Elite Explorer

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      The tune is setup for a 90mm from a lighting so it would have to be changed for them to work..he's over changing the tune and really wants nothing to do with it till its running right...
       
    12. boominXplorer

      boominXplorer Elite Ranger Elite Explorer

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      Shoot you have nothing to loose, you never know it could run completely different with a working MAF if yours is bum.

      If I were you I'd start retrofitting an obd2 harness on the truck. A 1995 harness would be plug and play I would think. There's also got to be a way to retrofit a sohc 4.0 computer to run it. That way you'd have a knock sensor to work with.
       
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    13. jd4242

      jd4242 Elite Explorer

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      Yea true
      Im looking at 1/4 horse honestly, uses same ecm and can live adjust and data log
       
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    14. CDW6212R

      CDW6212R Hauls the mail. Elite Explorer

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      I like those ideas best, get a control system on that which will handle things, plus can be data logged. You are lacking that information, to help you track down issues.

      I have a Lightning 90mm MAF that I got from a friend ages ago. He had it on his 03 Lightning and did the typical stuff, put on a cone filter(ground the MAF inlet edge down to clamp to it), raised the boost etc. I wish he had kept that truck, but he back then swapped cars way too often. He's had the 8 liter Dodge four door truck for a few years now, he's settled down in middle age, LOL.

      I'd be heppy to send you this MAF if it might help.
       

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    15. boominXplorer

      boominXplorer Elite Ranger Elite Explorer

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      Data logging ability is what you need. Then you can see what everything is doing when things are far off and get an idea where to look. I don't have any experience tuning but I couldn't imagine using your current pcm setup being anything but a headache since not a single parameter being input is factory specification on your truck. You are flowing 3x air and fuel compared to stock, I just think your trying to ask to much of that grandpa aged pcm.
       
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    16. jd4242

      jd4242 Elite Explorer

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      I agree and so is the tuner
       
    17. jd4242

      jd4242 Elite Explorer

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      Soooo dont even wanna say what the problem was...

      I can tell you it wasnt the ECM..also bought new O2s,maf,aic,temp sensors..nope none of those...

      Soooo go back and double check the wiring on tps,keep in mind i was getting .965v...well had the ground and the 5v backwards..switch them and todaaa it runs perfect...WHATTT A PIA!! How i mixed them up and still was getting .96v from my reference wire to what i thought was ground is beyond me but its fixed..

      Tune is off some but that was expected. .

      Wwwwwoooooooooo....now to give it some time and for my tuner to get over me,WHICH ill add he swore the tps COULDNT effect all that was going wrong,swore it was only used for idle and wot..which he definitely was wrong!!!..

      Any rate THANK GOD!!!

      For reference the obd1 wire for tps are
      Gray with red stripe=ground
      Gray with white stripe = reference
      Brown with white stripe=5v

      Now im using a foxbody tps so its colors are
      Black=ground
      Orange=5v
      Green=reference
       
      Last edited: November 13, 2017
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    18. Dono

      Dono V8 Limited turbo and retired SC 4.0 OHV Elite Explorer

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      congratulations JD!

      Nailed it!!!
       
    19. jd4242

      jd4242 Elite Explorer

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      Thanks man..i kept blaming you and Tim for my bad luck..hahaha
      But seriously seems like us 3 keep pushing the envelope and its really frustrating when we are doing stuff that others haven't and noone really has the answers. .i appreciate the positive support. .thanks man
       
    20. Dono

      Dono V8 Limited turbo and retired SC 4.0 OHV Elite Explorer

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      Yea, we are on our own as we create issues.
      No one wants to touch our shit. lol.

      I was kinda shaking my head while I was changing a headlight hid ballast today that randomly gives issues. There's nothing like factory stuff for reliability. We take reliable things, modify the crap out of them, and make them quirky and unreliable. Are we stupid?

      I was kinda looking at Cadillac cts-v's used today. Factory reliability, super comfortable, and gobs of power. Just dreaming.
       
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    21. Awon2zip

      Awon2zip Elite Explorer

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      Late birthday gift? Glad to hear some good news!
       
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    22. jd4242

      jd4242 Elite Explorer

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      Hahaha yes,yes we are....
      Funny you say that because i put led headlights in and was about to the point of blaming them for my problems. .lol

      Swear one day we are gonna all meet up and cry together over beers!!! Hahaha
       
    23. vroomzoomboom

      vroomzoomboom Elite Canuck STOCK SUCKS! Elite Explorer

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      dont be that guy.

      and what did we do? who wants something completely reliable, and doesnt take up every weekend chasing a problem or fixing something that your bad judgement broke?
       
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    24. jd4242

      jd4242 Elite Explorer

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      Haha yea we bleed blue..DONT DO IT..

      Yea if we didnt have issues to fix every weekend what would we do??? Im to old to pick up a drug habit and my liver is on its last leg...hahah
       
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    25. Dono

      Dono V8 Limited turbo and retired SC 4.0 OHV Elite Explorer

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      Id love to get out to your area one day just to tour around.
      Iv'e been to New York/New Jersey, but I'm certain your landscape is far different. I'd love to just tour down the coast.
       
    26. vroomzoomboom

      vroomzoomboom Elite Canuck STOCK SUCKS! Elite Explorer

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      *cough* Carlisle *cough*
       
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