Headscratcher of an intake problem

Discussion in 'V8 Discussion' started by Paul Guilfoil, Jul 30, 2018.

  1. 98SF19

    98SF19 AlphaKennyBuddy

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    Here's the front knock sensor wires - I think we can rule this one out.
    Is this the upward-most extent of the connector? It appears this was as high up as you were able to get it for the pic. If so, perhaps related to trans?
     

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  2. 99sho-time

    99sho-time SHO Member

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    the knock sensors have there own little harness. that harness connects to the rest of the engine harness which is held down and the connection usual sits low. its unlikely that his connector is related to the knock sensors imo. but its possible.
     
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  3. Paul Guilfoil

    Paul Guilfoil New Member

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    Was the coil wire. I did have a code. My computer put it on page 2!

    Had to remove intake to get to it. Anyone know where I can get manifold gaskets for upper intake?

    Have installed a new irmc I found online. Think it was the one from the duratec engine but bolted right up after I removed the mounting bracket. Cable too long but I need this thing to run not show.

    Will report ince I put back together.
     
  4. 99sho-time

    99sho-time SHO Member

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    ah dang that poor little cylinder!

    Those gaskets are highly reusable Ive used spray a gasket super high tack for some extra assurance just clean and surfaces.

    the duratec cable is longer? I use one I didn't notice that, it pulls the runners open all the way on mine.
     
  5. Paul Guilfoil

    Paul Guilfoil New Member

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    New imcr installed. Coil wire fixed. Runs amazing-then goes back to old tricks. Clear the code, runs great, intakes open and close, then engine lite comes on and won’t run under 3k. Error message that front bank not closing. But it is! When it goes bad I can clear the code in a few seconds and it is running perfectly. Could this be problem with pcu?
     
  6. Paul Guilfoil

    Paul Guilfoil New Member

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  7. GEN 3 SHO FAN

    GEN 3 SHO FAN SHO Member

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    Did you tryed what E1 said. Try this before anything if it wasn't made already.

    IMRC can develop weird troubles. I remember a post (somewhere here) where a guy said that his IMRC opens the butterflies when he turns on the car...

    I also running them wired open even if I haven't had a prob with them. The power and Yamaha sound comes a little bit sooner then. To wire them you have to make some place (removing Throttle body is a good idea) and time but I think it's a good way to test it.

    I see also you said in the first post that you cleaned them... How ? You unbolt all the butterflies from their opening rod or you cleaned them in place ? Maybe one is loose if they were unbolted. I hope nothing went wrong there.
     
  8. Paul Guilfoil

    Paul Guilfoil New Member

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  9. Paul Guilfoil

    Paul Guilfoil New Member

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    Problem solved! Wow!. The imrc stuck open was a false signal from a defective pcu. Swapped out pcu, got rid of code, but problem remained. Took to best electrical problem mechanic in Florida. After numerous attempts using sophisticated diagnostic tools, answer came from a post on a website. One of the ignition coils was producing a stray voltage that was glitching the pcu. Swapped out coils, do all 4 in back, swap out fronts til u find bad one. Running like a dream. My mechanic was incredible. Would not quit.
     
  10. GEN 3 SHO FAN

    GEN 3 SHO FAN SHO Member

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    Good ! I'm glad you resolved this prob. Not the easiest one.

    Hope you replace your PCM with an identical year, it can create other weird troubles as Ford made some changes on PCM and wiring over year between 96 and 99. Do you know which year is the replacement PCM was from ?

    Did you kept your old IMRC as a spare one ?

    IIRC, this particular trouble is caused by coil #8 which can be swapped with another one. Don't know why, the #8 can be the source of some electrical troubles.

    In the case if you don't know coil # :
    Rear bank :
    1-2-3-4
    Front bank :
    5-6-7-8

    Good rides !
     
    Last edited: Feb 5, 2019
  11. 99sho-time

    99sho-time SHO Member

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    That's interesting. Stray voltage I wonder what that actually means how it made its way to the pcm. im guessin it had a misfire? what kinda coil was it motorcraft different new or old?
     
  12. Paul Guilfoil

    Paul Guilfoil New Member

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  13. Paul Guilfoil

    Paul Guilfoil New Member

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    Replaced with new Motorcraft. Don’t know what was in there. The voltage anomoly was so brief it wouldn’t trigger a code and it was very intermittent, making diagnosis very difficult. There is a poster on this site who seems to have experience with this issue and has localized the problem to coil pack #8.
     
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  14. Paul Guilfoil

    Paul Guilfoil New Member

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    I bought an aftermarket imrc, broke the cable end on it, tested the old one, found old one was fine, put it back in. The new one is , I think, the Duratec version. The cable is way long but it seems to work. Cable end is fixable.
     
  15. 99sho-time

    99sho-time SHO Member

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    ah yes I belive i recall mister Nimz mention #8 is doing something of that sorta thing.
     

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