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M90 rebuild (rudy)

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

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    1. jd4242

      jd4242 Elite Explorer

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      Well after replacing EVERY sensor AGAIN i think i found the issue. ........

      I had my O2 banks backwards. .apparently there is spose to be one grey and one white connector, dictating which bank the O2 controls...both of mine are white..this truck had 2 O2 both pre-cat and one per y-pipe originally...

      So basically one bank was needing fuel but the O2 was adding it to wrong set of injectors which mad the other O2 read even richer which in turn was taking fuel away from the original bank needing fuel causing it to be even more lean..or something like that..seems to have ran fine for last 45 minutes in the garage. .its pouring rain here so im gonna wait till tomorrow to test drive it,plus im a couple drinks deep!!!

      Say a prayer that was the issue! !
       
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    3. Centaurus5.0

      Centaurus5.0 Elite 5.0L Fiddler

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      Your doing it all wrong, you need to reverse that order.

      1.Say a prayer
      2.Have a couple more drinks
      3.Go reenact Tokyo Drift in the rain for 45 minutes.

      As a friend, I'm saying, you only live once.
       
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    4. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      That's a fairly common mistake but difficult to find with OBD-I. For OBD-II vehicles that are cross wired one bank will have a lean code and the other bank a rich code. My advice to find the problem easily is to disconnect one sensor and see if the O2 heater fault bank matches the one disconnected. I'm glad you found the problem!
       
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    5. Dono

      Dono V8 Limited turbo and retired SC 4.0 OHV Elite Explorer

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      Traction seems to be an issue. lol.
      Smart man to just relax and have another celebration drink.

      In our younger years we probably wouldn't have exercised good judgement.
       
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    6. jd4242

      jd4242 Elite Explorer

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      Haha my girl came out to garage(given its a detached and had main door cracked about a foot and windows open) to see me sitn on a stool,smoking cigarettes and drinking a mixed drink with the truck running...

      See goes """awwww shit you've given up and committing suicide aren't you???"""hahah i said YEEEPPPPP and told her to leave me be!!!
       
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    7. jd4242

      jd4242 Elite Explorer

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      Kinda the way i found out,i unplugged each one at a time and it made it rich or lean...then pulled plugs and could tell that side was not rich or lean..3 sets of plugs,4 O2s,1 coolant sensor, 1 tps and 1 crank sensor i decided to swap banks to see if it effected the opposite bank and sure as hell it did..

      O also unplugging the O2 does not throw a cel,it may throw a non cel code but other than a paper clip method i dont have a way of seeing them
       
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    8. Centaurus5.0

      Centaurus5.0 Elite 5.0L Fiddler

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    9. CDW6212R

      CDW6212R Hauls the mail. Elite Explorer

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      Good, great to hear. Sorry it was a lot of stress, stuff happens no matter what.

      Some drinks are good, but do it at home, you also only die once.:chug:o_O
       
    10. jd4242

      jd4242 Elite Explorer

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      Well it appears to be fixed,been running last couple days with no issues. .going to give it awile and try to head back to dyno for final tune
       
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