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Thread: Engine developed a miss the other day... loss of power.

  1. #1
    Senior Member Josh S's Avatar
    Join Date:  Oct 2014

    Location:  Leesburg, NJ

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    My VIN:    7178

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    Engine developed a miss the other day... loss of power.

    Drove the DeLorean to work the other day and when I got there, I smelled a faint melting rubber smell. Thought it might be a belt, so I quick checked the belts and none were shiny or hot from slipping. Thought I'd check it out better after work when I got home. On my way home about 10 minutes into the drive, accelerating through fourth gear, it happened.... lost power and felt just like a spark plug miss. Pulled over, and couldn't see any wires loose or melted. Still smelled the rubber smell too. Very faintly. Got it home, but something definitely isn't right.

    I had similar symptoms happen to me in my Geo, it was a wire melted and shorting on the exhaust manifold. (Rubber smell, engine miss.) But checking under the hood, the wires in the D run on top, and nowhere near the exhaust.

    So, I plan on checking the wires and vac hoses as they are a giant snarl and not routed very well on my car. But is there any DeLorean-specific problem this might be?

    Thanks!
    "If you're going to spend your inheritance on a car, why not do it with some style!"

  2. #2
    One of those purists you keep hearing about. sdg3205's Avatar
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    Quote Originally Posted by Josh S View Post
    Drove the DeLorean to work the other day and when I got there, I smelled a faint melting rubber smell. Thought it might be a belt, so I quick checked the belts and none were shiny or hot from slipping. Thought I'd check it out better after work when I got home. On my way home about 10 minutes into the drive, accelerating through fourth gear, it happened.... lost power and felt just like a spark plug miss. Pulled over, and couldn't see any wires loose or melted. Still smelled the rubber smell too. Very faintly. Got it home, but something definitely isn't right.

    I had similar symptoms happen to me in my Geo, it was a wire melted and shorting on the exhaust manifold. (Rubber smell, engine miss.) But checking under the hood, the wires in the D run on top, and nowhere near the exhaust.

    So, I plan on checking the wires and vac hoses as they are a giant snarl and not routed very well on my car. But is there any DeLorean-specific problem this might be?

    Thanks!
    Is fuse 7 melting?
    Dave

    Here, somewhere.


  3. #3
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

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    Quote Originally Posted by sdg3205 View Post
    Is fuse 7 melting?
    +1
    Also check your fan fail jumpers and fuses if you have those. Those jumpers won't cause the miss but could cause the burning smell.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  4. #4
    Senior Member mluder's Avatar
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    Location:  Happy Valley, OR

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    There"s a couple dangerously close to the CAT on the drivers side and the axle on the passenger side worth looking at.

    Cheers
    Steve M
    Cheers
    Steven Maguire
    #4456


    IT'S A TRAP!!!!!

  5. #5
    Delorean Guru
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    Check the fuse block. If an automatic check the wiring harness to the shift computer.
    David Teitelbaum

  6. #6
    Senior Member Josh S's Avatar
    Join Date:  Oct 2014

    Location:  Leesburg, NJ

    Posts:    134

    My VIN:    7178

    Club(s):   (DMA)

    Quote Originally Posted by sdg3205 View Post
    Is fuse 7 melting?
    I'll check that.

    Quote Originally Posted by Bitsyncmaster View Post
    +1
    Also check your fan fail jumpers and fuses if you have those. Those jumpers won't cause the miss but could cause the burning smell.
    Would the fan fail be in the engine compartment? I assume the fuse will be. My car runs really cool, fans hardly run and it was cool out that day. But I do know the PO replaced the fan with new upgraded ones. Perhaps they draw a bit more juice than stock.

    Quote Originally Posted by mluder View Post
    There"s a couple dangerously close to the CAT on the drivers side and the axle on the passenger side worth looking at.

    Cheers
    Steve M
    Actually, I was sensing the smell more on the driver's side. This might be the case, especially if the wires are routed poorly as mine are.

    Quote Originally Posted by David T View Post
    Check the fuse block. If an automatic check the wiring harness to the shift computer.
    Fuse #7, fuses in general going to get checked. And it's a 5spd. Forgot to mention that.


    Thanks all. I'll probably get time to go poking around on Wed or Thurs. This gives me a good place to start.
    "If you're going to spend your inheritance on a car, why not do it with some style!"

  7. #7
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

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    Quote Originally Posted by Josh S View Post
    Would the fan fail be in the engine compartment? I assume the fuse will be. My car runs really cool, fans hardly run and it was cool out that day. But I do know the PO replaced the fan with new upgraded ones. Perhaps they draw a bit more juice than stock.
    The fan fail is the blue relay socket behind passenger seat. If you have new low power fans than your probably fine with the fan fail.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  8. #8
    Senior Member Josh S's Avatar
    Join Date:  Oct 2014

    Location:  Leesburg, NJ

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    My VIN:    7178

    Club(s):   (DMA)

    Ok, this weekend I decided I better find the miss in 7178 soon because DMA is only 2 weeks away...

    So here's what I found.

    delorean miss.jpg

    The connector in the circle, I'm assuming is a diagnostic of some sort. The melted connector (with the arrow) was just kind of hanging out right where it is so I will assume it is not the problem, though it may have once been related. That melted connector heads to the underside of the diagnostic, along with another wire (or group in a loom, I can't tell from the topside) that come up from under the engine. And that other wire(s) is/are definitely melted on the manifold and I will wager, making contact. Now, I haven't gotten under the car to see where that wire(s) go off to. But, can anyone give me a heads up as to what this group of wires should go to, and where it should be routed properly? There are a lot of weirdly routed wires/hoses/lines in my engine bay... like my spark plug wires that look like someone french braided them.
    Attached Images
    "If you're going to spend your inheritance on a car, why not do it with some style!"

  9. #9
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

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    Quote Originally Posted by Josh S View Post
    Ok, this weekend I decided I better find the miss in 7178 soon because DMA is only 2 weeks away...

    So here's what I found.

    delorean miss.jpg

    The connector in the circle, I'm assuming is a diagnostic of some sort. The melted connector (with the arrow) was just kind of hanging out right where it is so I will assume it is not the problem, though it may have once been related. That melted connector heads to the underside of the diagnostic, along with another wire (or group in a loom, I can't tell from the topside) that come up from under the engine. And that other wire(s) is/are definitely melted on the manifold and I will wager, making contact. Now, I haven't gotten under the car to see where that wire(s) go off to. But, can anyone give me a heads up as to what this group of wires should go to, and where it should be routed properly? There are a lot of weirdly routed wires/hoses/lines in my engine bay... like my spark plug wires that look like someone french braided them.
    The diagnostic connector has an orange wire from the bulkhead which lets you read the dwell of the frequency valve. There is also a purple wire from the bulkhead which supplies 12 volts from the dome light circuit. A black wire supplies ground and a sensor from the flywheel gear supplies an RMP related signal.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  10. #10
    Senior Member Josh S's Avatar
    Join Date:  Oct 2014

    Location:  Leesburg, NJ

    Posts:    134

    My VIN:    7178

    Club(s):   (DMA)

    Quote Originally Posted by Bitsyncmaster View Post
    The diagnostic connector has an orange wire from the bulkhead which lets you read the dwell of the frequency valve. There is also a purple wire from the bulkhead which supplies 12 volts from the dome light circuit. A black wire supplies ground and a sensor from the flywheel gear supplies an RMP related signal.
    Well, that could be why my battery kept dying unusually fast as well....
    "If you're going to spend your inheritance on a car, why not do it with some style!"

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