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'93 940T Instrument Panel Woes 900 1993

Hey guys, really need some help with something. I drove my 1993 940 turbo wagon to work this morning - nothing unusual about the ride in, until I got the parking lot at work. I put the car in park, and it seemed to be idling high (1500rpms), and then it just instantly died. The car will no longer start. It turns over, and turns over, but doesn't start.

Some of the back story - last weekend, the car went on a 3-day hiatus of not starting with no spark. Everything appeared to be working fine, except there was no spark from the coil, even though the coil was getting power. As a last ditch effort to get it started, I traced the red/white wire from the coil all the way back to the instrument panel where it plugs into the 8-pin connector at the back of the tach. I wiggled this connector around and the car started right up.

Fast forward to today, about 4 days later, the car is again dead. My question is, what would cause this connector to keep coming loose or making poor contact? Is there a way to "tighten" the connector to the instrument panel, or is the entire panel itself on the fritz and causing the issue? Any help would be great, I'm going to try to get this fixed enough to drive home after work in the freezing cold dark, but would love to take care of it permanently.








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    '93 940T Instrument Panel Woes 900 1993

    Inspect the crank position sensor (CPS) at the back of the engine. The sensor secures to a sometimes frail plate in a notch at the top of the bellhousing where it meets the engine block.

    The cable sheath tends to fail as does the sensor.

    ON a 1993, you also have the OBD 1 diagnostic trouble code (DTC) check box. You can check for fault codes with the fuel injection and ignition control system.

    See here (copy and paste URL):

    https://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm

    And other Volvo 700 - 900 series FAQ here:
    https://www.brickboard.com/FAQ/700-900/

    The red and white wire sends the spark signal to the tacho. Disconnection does not disable an engine.

    There may be other causes. Inspect the fuses and relays behind the ashtray. DO you have a spare white fuel injection relay. How do the fuses appear?
    --
    Beh.








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      '93 940T Instrument Panel Woes 900 1993

      Hi Kitty -

      After looking at the car in the parking lot at work, I found one of the engine harnesses to be complete junk. The bullet connectors were basically completely loose on the female side of the connector which houses the blue and red/white wires that go to both coil leads, as well as the ground for the power stage and both knock sensor wires.

      I was able to "wiggle" the connector and the car started right up. I drove it home, and while it was idling, I touched the connector again and it stalled immediately.

      For now, I pushed the female side of the bullet connectors thru the plastic harness connector, and connected them to their male counterparts on the male connector side, and then slid the plastic connector back over them and clicked it in. The car has been running fine since, and for a more permanent fix I was able to order a new connector with wires from Dave Barton.

      Although, would it be better/is there any con to just cutting the plastic harness connectors out of the car all together and wiring the wires directly together? Just trying to think about why these harness connectors exist in the first place, when it seems like all they can do is make things worse.








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      '93 940T Instrument Panel Woes 900 1993

      Agreed +1 with what Kitty said. The red-white wire connects to the tachometer, ign coil and ign module (located near left inner fender). Inspect the ign module for dried heat paste/silicone paste. Overheated ign module could cause temporary no spark.

      Amarin.







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