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Thread: Omni GLH Turbo suddenly dead

  1. #21
    Supporting Member II Turbo Mopar Contributor
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    Re: Omni GLH Turbo suddenly dead

    Quote Originally Posted by cordes View Post
    it was just recently that someone posted up a file showing an oscilloscope reading which showed that an aftermarket unit did indeed put out a different pattern than a stock one..
    That someone was me!! I used a logic analyzer to produce the data.
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  2. #22
    Supporting Member Turbo Mopar Contributor iTurbo's Avatar
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    Re: Omni GLH Turbo suddenly dead

    Quote Originally Posted by 4 l-bodies View Post
    Jeremy, Be careful using Cardone reman'ed stuff. I've seen some awfully shady parts come from Cardone. So bad if fact, in one case the reman'ed replacement part was WAY worse than the part I was taking off! For spare parts, I guess but beware. I would love to take apart that distributor (removing shaft etc.) and see what It looks like.
    Todd
    I've gotten A-1 Cardone reman rack & pinions from Rock Auto before (my SL and R/T) and no problems so far here. Remans are a bit of a crap shoot though. Even if the distributor itself isn't good, if I get a good HEP out of it for $18 I'll be happy. I have a few good '86-up bare distributors anyway.
    87 Shelby Lancer #127
    91 Dodge Spirit R/T
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  3. #23
    Supporting Member Turbo Mopar Contributor 2.216VTurbo's Avatar
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    Re: Omni GLH Turbo suddenly dead

    Since we're talking failed HEP's here, I had a new one on me last weekend. I've been chasing multiple issues on my freshly built 2.5 in Woody the turbo Mini, too much to go into here but it's been frustrating the F outta me Last weekend I made more changes cam out *again, etc,etc but when I fired it again it was better but still rough. Fortunately it was getting dark, dark enough to see sparks dancing back and forth between the two HEP wires! I pulled it out and inspected it, didn't see any breaks in the insulation but they were a little damaged where the dist cap seats. Swapped out for a spare J yard and bingo! roughness and stumbling is gone! Thru that other one in the trash so it doesn't end up getting used again

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  4. #24
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    Re: Omni GLH Turbo suddenly dead

    Quote Originally Posted by 2.216VTurbo View Post
    I pulled it out and inspected it, didn't see any breaks in the insulation but they were a little damaged where the dist cap seats
    I have fixed a few "BAD" ones by cutting out the section where the dist cap seals. Resolder and away they go. I believe the reason they break is the lack of strain relief.
    Last edited by chromguy; 02-28-2019 at 11:28 PM.
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  5. #25
    Supporting Member Turbo Mopar Contributor iTurbo's Avatar
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    Re: Omni GLH Turbo suddenly dead

    My gold Omni has been great in the last few days with just the power module replacement. It's still using the HEP that came in the car when I bought it, and actually it still has the same Mopar coil too, which might be original for all I know (90k miles).

    I did have an early ('85) HEP that 'worked' once, but it made a scraping sound inside the distributor cap. Apparently it was a manufacturing defect and the shutter wheel was physically contacting the hall effect magnets. It has been fine with a cheap replacement from Rock Auto. :shrug:
    87 Shelby Lancer #127
    91 Dodge Spirit R/T
    08 Dodge Caliber SRT-4
    86 Dodge Omni GLH Turbo

  6. #26
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    Re: Omni GLH Turbo suddenly dead

    Quote Originally Posted by iTurbo View Post
    . It's still using the HEP that came in the car when I bought it, and actually it still has the same Mopar coil too,
    I am the only owner of my 87 DD, it is still running the original HEP, coil with wire/distro cap a rotor. The only electrical issue was a faulty Air charge sensor 25 years ago.
    Last year I changed the timing belt just because I thought I should. My wife's Toyota truck 2005 appears to be just as reliable.
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  7. #27
    Supporting Member Turbo Mopar Contributor iTurbo's Avatar
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    Re: Omni GLH Turbo suddenly dead

    Well I spoke too soon. The Omni was fine after the power module replacement for about a week. It died while I was on the way to a job site today, but thankfully it died on our property so it's not like it has to be towed asap like before. Same situation; the only code 43 (ignition coil) came back, and it cranks over fine and has fuel pressure. I can't believe I had two PM fails in a week.

    It is supposed to get down to -20F this weekend, so it will be next week before I touch it. My parts showed up from Rock Auto though, so I now have two new HEPs, a complete distributor with wires, and a new ignition coil. I also have another spare PM to try.
    87 Shelby Lancer #127
    91 Dodge Spirit R/T
    08 Dodge Caliber SRT-4
    86 Dodge Omni GLH Turbo

  8. #28
    Supporting Member II Turbo Mopar Contributor Dr. Johny Dodge's Avatar
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    Re: Omni GLH Turbo suddenly dead

    icy map sensor or vac system ???

    a buddy had a shelby charger in the way back that sprayed salt water through a small hole right beside the bottom of the LM
    fubar'd the inside of the screw on map sensor


    swapped (and bagged) and good to go

  9. #29
    Supporting Member Turbo Mopar Contributor iTurbo's Avatar
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    Re: Omni GLH Turbo suddenly dead

    I'll look into that too. It is fairly high and dry here, but brutally cold lately.

    One thing that has happened in the last week, is that the charging voltage has dipped and I get belt screech. I've also had some fuel leakage out of some hoses that I need to address. It's crazy what the cold will do to rubber and then all sorts of crap happens.

    Anyway, about the charging voltage dipping....could that be 'hard' on a PM and the ignition coil driver (transistors)? I'm thinking possibly because I know some things, like light bulb filaments will fail prematurely if not driven at proper voltage. Just a hunch I guess.
    87 Shelby Lancer #127
    91 Dodge Spirit R/T
    08 Dodge Caliber SRT-4
    86 Dodge Omni GLH Turbo

  10. #30
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    Re: Omni GLH Turbo suddenly dead

    Quote Originally Posted by iTurbo View Post
    Anyway, about the charging voltage dipping....could that be 'hard' on a PM and the ignition coil driver (transistors)? I'm thinking possibly because I know some things, like light bulb filaments will fail prematurely if not driven at proper voltage. Just a hunch I guess.
    Transistors will be fine with lower voltages as they are designed to function this way. They do have voltages maximums but it is unlikely your voltage reg can run that high. 35-50V are typically voltage max.
    How are you with electronics? I do have partial schematics for the PM that may be helpful in checking the PM.

    Could we be having a bad connection at a connector perhaps? Could 30 years of corrosion causing an issue ?
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  11. #31
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    Re: Omni GLH Turbo suddenly dead

    Itís probably a connector issue. My car had issues until I pulled the PM connectors and carefully bent all the terminals back in so they would make a better connection at the module. Clean them up, bend the terminals back, apply fresh dielectric grease.

  12. #32
    Supporting Member II Turbo Mopar Contributor Dr. Johny Dodge's Avatar
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    Re: Omni GLH Turbo suddenly dead

    re the barrel style terminal in the plugs
    DON'T stick anything into them thinking your gonna scrape the crud out
    there is a tang inside the barrel that actually makes contact with the pin on the PM/SMEC etc

    I had a buddy do this with my torch tip cleaner tool one night
    yes we spent the rest of the evening searching another set of connectors outta my basement and splicing them on ...

  13. #33
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    Re: Omni GLH Turbo suddenly dead

    Aries_Turbo suggested using Deoxit D5 (an high end audio contact cleaner) . I bought a can sitting on the shelf ready for action.
    https://caig.com/
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  14. #34
    Supporting Member Turbo Mopar Contributor iTurbo's Avatar
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    Re: Omni GLH Turbo suddenly dead

    Quote Originally Posted by chromguy View Post
    Transistors will be fine with lower voltages as they are designed to function this way. They do have voltages maximums but it is unlikely your voltage reg can run that high. 35-50V are typically voltage max.
    How are you with electronics? I do have partial schematics for the PM that may be helpful in checking the PM.

    Could we be having a bad connection at a connector perhaps? Could 30 years of corrosion causing an issue ?
    I am also thinking it must be a connector issue, probably the 10-way right on the PM. Unfortunately the barrel pins inside aren't removable, so hopefully I can make it right without having to chop/splice on a whole good connector. I know the ignition coil driver is position #1 on that plug and the black/yellow wire.

    I am not very good with electronics...but I do know my way around the wire harnesses pretty well. I would certainly try to open the PM and find the transistors that drive the coil and test them with a multimeter. Are they buried under thick potting compound? It would be nice to know for sure before I throw them out.
    87 Shelby Lancer #127
    91 Dodge Spirit R/T
    08 Dodge Caliber SRT-4
    86 Dodge Omni GLH Turbo

  15. #35
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    Re: Omni GLH Turbo suddenly dead

    how did the ground check go? a set of booster cables can add some grounds in a second.
    I had a bad asd relay once, it was mounted upside down and condensation caused it to fail. I chased that relay problem for months. had the whole harness cut open looking for a short. just another thing.
    1988 Lancer Shelby 2.2TII 1989 Shadow ES 2.5TI 1992 Lebaron Sedan 3.0Auto 1993 Acclaim 2.5TI-A520 Hoard parts now!

  16. #36
    Supporting Member Turbo Mopar Contributor iTurbo's Avatar
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    Re: Omni GLH Turbo suddenly dead

    Quote Originally Posted by raccoon View Post
    how did the ground check go? a set of booster cables can add some grounds in a second.
    I had a bad asd relay once, it was mounted upside down and condensation caused it to fail. I chased that relay problem for months. had the whole harness cut open looking for a short. just another thing.
    I haven't been able to try yet. It's been waaaay below zero this whole weekend and the car is still stalled out near my work place. -17'F when I got up this morning! I can't wait for spring to arrive because I will be doing a whole lot of maintenance and updates to the car.
    87 Shelby Lancer #127
    91 Dodge Spirit R/T
    08 Dodge Caliber SRT-4
    86 Dodge Omni GLH Turbo

  17. #37
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    Re: Omni GLH Turbo suddenly dead

    Quote Originally Posted by iTurbo View Post
    ...but I do know my way around the wire harnesses pretty well. I would certainly try to open the PM and find the transistors that drive the coil and test them with a multimeter. Are they buried under thick potting compound? It would be nice to know for sure before I throw them out.
    The good news, its functionality can be troubleshooted without opening it up! When you are ready, LMK and I can help you. I also have a few on the shelf that I can test. I believe they are potted but I only have mine opened to see if they were similar to the power board inside the SMEC. I will check after lunch as I am replacing a rotor on the Sundance.
    Partial schematics
    https://drive.google.com/open?id=0B3...lBxek1ReXRiVVU
    https://drive.google.com/open?id=0B3...Gc1ZFF4S051eDQ
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  18. #38
    Supporting Member II Turbo Mopar Contributor Dr. Johny Dodge's Avatar
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    Re: Omni GLH Turbo suddenly dead

    pm's are potted , yes

  19. #39
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    Re: Omni GLH Turbo suddenly dead

    Clean out all the old dielectric grease. Grab a small pointy pick and a magnifying glass. Look inside the PM terminals on the harness connector. Youíll see the metal tangs that need to stick out to make contact with the male side on the PM. Carefully use the pick to bend them back outward so they make good contact again. Apply dielectric grease on the OUTSIDE/around the connector. Remember, the grease only keeps water out. Applying it to the terminals can cause the pin to make poor contact again. Liquids/solids donít compress. Grease on the terminal will actually push the tang and bend it back the wrong way. People use dielectric grease too liberally thinking it will help the connection. There is a product called stabilant 22a. It is a liquid you apply to terminals and it actually helps make electrical contact when dry. Very $$$$ but Iíve used it many times with good results.

  20. #40
    Supporting Member II Turbo Mopar Contributor Dr. Johny Dodge's Avatar
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    Re: Omni GLH Turbo suddenly dead

    if you need to replace a barrel connector it can be done

    another connector pigtail with wires has to be sacrificed though
    hack a connector and wire free of the part source connector

    clip the wire off the location where the terminal needs replaced
    cut it flush with the connector body

    now slowly drill out the wire and barrel connector

    slide the new terminal in from the PM/smec side with a little dab of silicone and splice it back to the wire you cut

    go slow
    use a drill bit notably smaller than the hole for the wire and terminal

    better to work it lose because it got warm from the friction of the bit...

    success rate goes up splicing on only one needed terminal

    adding another entire connector opens the opportunity for another .. or two . four bad connections you just installed

    especially with 30 odd year old connectors

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